CN110778448A - Embedded threaded sleeve for blade root of fan blade and design method thereof - Google Patents
Embedded threaded sleeve for blade root of fan blade and design method thereof Download PDFInfo
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- CN110778448A CN110778448A CN201911036001.0A CN201911036001A CN110778448A CN 110778448 A CN110778448 A CN 110778448A CN 201911036001 A CN201911036001 A CN 201911036001A CN 110778448 A CN110778448 A CN 110778448A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000011152 fibreglass Substances 0.000 claims abstract description 26
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 238000004458 analytical method Methods 0.000 claims description 22
- 239000003365 glass fiber Substances 0.000 claims description 20
- 238000004804 winding Methods 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 238000010586 diagram Methods 0.000 claims description 3
- 230000000750 progressive effect Effects 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000004080 punching Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
-
- 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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- Life Sciences & Earth Sciences (AREA)
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- Sustainable Energy (AREA)
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- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a fan blade root embedded screw sleeve and a design method thereof, and the fan blade root embedded screw sleeve comprises a blade root embedded screw sleeve body, wherein the blade root embedded screw sleeve body is of a conical sleeve structure, the small end of the conical sleeve structure is a blade tip screw sleeve end and is provided with internal threads, the large end of the conical sleeve structure is a blade root screw sleeve end and is in contact with a fan bearing, the outer wall of the conical sleeve structure is provided with external teeth, the external teeth consist of multiple continuous arcs, the multiple continuous arcs form a wavy structure and are used for increasing the contact area with surrounding composite materials and improving the tensile resistance of the blade root embedded screw sleeve body, the small end part of the conical sleeve structure is provided with a dovetail-shaped slot, so that the wall thickness of the inner wall of the small end part can be gradually reduced, and the stress concentration of glass fiber reinforced plastics around the blade root embedded screw sleeve body. The invention has the advantage of high drawing resistance, can avoid the stress concentration of the glass fiber reinforced plastics around the tip screw sleeve end and improve the bearing capacity of the blade root bolt.
Description
Technical Field
The invention relates to the technical field of fan blade root connection, in particular to a fan blade root embedded threaded sleeve and a design method thereof.
Background
The root connection of the large fan blade mainly adopts a T-bolt connection and an embedded threaded sleeve connection mode. The most common T-bolt connection for fan blades. The extrusion contact surface of the blade root round nut and the glass fiber reinforced plastic is a position where stress concentration is easy to occur, and the thickness of the root of the blade root is about 120mm generally, so that the safety coefficient of the glass fiber reinforced plastic of the blade root is guaranteed. However, at present, the onshore fan enters the 5MW era, the size of the fan blade is longer and longer, the length of the blade is larger than 75 meters, the traditional T-bolt connection mode can not meet the requirements of static strength and fatigue strength of the blade root, the blade root laying layer structure can not be damaged by adopting the blade root embedded threaded sleeve, more bolts can be distributed in the embedded threaded sleeve connection mode than the T-bolt connection mode, and the safety performance of the blade root can be improved. In addition, the use of punching machine equipment is avoided, the purchase cost of the punching machine equipment and the field required for punching are saved, and the damage of the glass fiber reinforced plastics of the blade root caused by punching is also avoided.
The embedded thread sleeves are embedded into the blade root in the laying process and integrally poured and formed with the glass fibers to be used for blade root connection, and the embedded thread sleeve connection mode has the advantage that the connection force of a single connecting piece can be reduced. The thread sleeves commonly used in the industry at present mainly comprise the following three types:
1) as shown in fig. 1, the boss type thread insert is provided, the outer teeth of the thread insert have large intervals, the width of the boss is also wide, and the groove is deep; the thread sleeve has the advantages of relatively small yarn winding area, deep groove, thick yarn needing to be wound, incomplete infiltration of the yarn which is easy to bleed in the actual production process and high risk.
2) As shown in fig. 2, the thread type thread insert is provided, the external teeth of the thread insert are similar to the thread shape, the thread insert winding area is large, but the processing precision requirement is high, the manufacturing cost is high, the external teeth are sharp, stress concentration is easily formed, and the winding yarn fails.
3) As shown in figure 3, the screw sleeve is a smooth screw sleeve, the outer wall of the screw sleeve is smooth, the tail end of the screw sleeve is in wedge-shaped transition, the screw sleeve is directly contacted with glass fiber reinforced plastic in the manufacturing process, yarn winding is not needed, the manufacturing is simple, but the requirement on the surface roughness of the screw sleeve is strict, and the drawing force test value is lower.
Meanwhile, in actual use, a glass fiber reinforced plastic layer is arranged around the tip screw sleeve end of the screw sleeve, when the rigidity of the tail end of the screw sleeve is suddenly reduced, the glass fiber reinforced plastic layer has great stress concentration, the screw sleeve needs to protrude out of the blade root end face in the actual manufacturing process, only the blade root embedded screw sleeve end face of the whole blade is in contact with a fan bearing, and the blade root bolt load connection coefficient is increased due to the small contact area. In combination with the above problems, there is a need for a blade root embedded thread insert with high pulling resistance, which can improve the bearing capacity of a blade root bolt and avoid the stress concentration of a glass fiber reinforced plastic layer around the tip thread insert end of the thread insert, and a design method thereof.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a fan blade root embedded threaded sleeve and a design method thereof, which have the advantages of high tensile strength, can avoid the stress concentration of glass fiber reinforced plastics around the tip threaded sleeve end and improve the bearing capacity of a blade root bolt.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: the utility model provides a pre-buried swivel nut of fan blade root, includes the pre-buried swivel nut body of blade root, the pre-buried swivel nut body of blade root is the toper cover structure, the tip swivel nut end is held to the tip of tip to processing has the internal thread, and its main aspects is the root swivel nut end, contacts with fan bearing, the outer wall processing of toper cover structure has the external tooth, the external tooth comprises the continuous circular arc of multistage, and the continuous circular arc of this multistage constitutes wave line type structure for increase and surrounding combined material area of contact improve the tensile pulling resistance of the pre-buried swivel nut body of blade root, the tip of toper cover structure is equipped with dovetail fluting, can make the inner wall thickness of this tip reduce gradually, prevents that the glass steel stress around the pre-buried swivel nut body tip of blade root from concentrating.
A design method of a pre-buried threaded sleeve of a blade root of a fan blade comprises the following steps,
1) establishing a three-dimensional model of a blade root embedded thread sleeve body, wherein external teeth of the blade root embedded thread sleeve body are composed of a plurality of continuous arcs, the plurality of continuous arcs form a wavy structure, the contact area of the blade root embedded thread sleeve body and surrounding composite materials can be increased, the tensile force is improved, the radius of a pitch circle of each arc is R, glass fiber yarns are wound on the external teeth of the three-dimensional model of the blade root embedded thread sleeve body in a simulation mode, and the R value corresponding to the maximum tensile force of the glass fiber yarns is obtained through iterative analysis and calculation;
2) the stress distribution diagram of the glass fiber reinforced plastics around the tip screw sleeve end of the blade root embedded screw sleeve body is obtained through finite element analysis, and in order to solve the problem of stress concentration of the glass fiber reinforced plastics, a dovetail-shaped slot is arranged in the tip screw sleeve end, so that the wall thickness in the tip screw sleeve end is gradually reduced, the local rigidity transition is smooth, the stress transition of the glass fiber reinforced plastics is uniform and smooth, and the anti-pulling performance of the blade root embedded screw sleeve body is improved;
3) the blade root embedded screw sleeve body is designed into a conical sleeve structure through finite element analysis, namely the diameter of a blade root screw sleeve end is increased, the contact area of the end face of the blade root screw sleeve end and a fan bearing is further increased, and the load connection coefficient of a blade root bolt is reduced.
Further, in the step 1), iterative analysis is carried out by adopting a progressive failure theory analysis method, and the specific steps are as follows,
a) defining initial conditions, establishing an initial model of a blade root embedded thread sleeve body, defining an initial arc radius R, simulating and winding glass fiber yarns on external teeth of a three-dimensional model of the blade root embedded thread sleeve body, and applying boundary constraint conditions and initial loads;
b) analyzing and calculating finite element stress;
c) analyzing the stress of the wound glass fiber yarn by using a maximum stress criterion, if the glass fiber yarn is not damaged, continuing to increase the external load, continuing to analyze the stress until the glass fiber yarn is broken, and outputting the external load at the moment;
d) changing the value of the radius R of the circular arc, and carrying out calculation and analysis again in the steps a), b) and c); and obtaining an R value corresponding to the maximum drawing resistance value of the contact between the blade root embedded thread sleeve body and the surrounding composite material through the cyclic iterative analysis.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the embedded screw sleeve of the blade root has high pulling resistance, can avoid the stress concentration of the glass fiber reinforced plastic layer around the screw sleeve end of the blade tip, can effectively reduce the load connection coefficient of the blade root bolt, improves the static force and fatigue safety performance of the blade root bolt, improves the safe and reliable grade of the blade root connection, and ensures the safety of a fan.
Drawings
Fig. 1 is a schematic structural view of a boss type thread insert.
Fig. 2 is a schematic structural view of a screw-type thread insert.
Fig. 3 is a schematic structural view of a smooth type insert.
Fig. 4 is a cross-sectional view of the root insert of the present invention.
Fig. 5 is a cross-sectional view of the connection of the root embedded screw sleeve of the present invention.
Fig. 6 is an exploded view of the root embedded swivel nut assembly of the present invention.
FIG. 7 is a flow chart of iterative design of external teeth R of the blade root embedded threaded sleeve according to the invention.
FIG. 8 is a graph showing the stress distribution of the glass fiber reinforced plastic around the small end of the root embedded screw sleeve of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
As shown in fig. 4, the fan blade and blade root embedded thread insert according to the embodiment includes a blade root embedded thread insert body 11, the blade root embedded thread insert body 11 is a conical sleeve structure, a small end of the conical sleeve structure is a blade tip thread insert end and is processed with an internal thread 113, a large end of the conical sleeve structure is a blade root thread insert end and is in contact with a fan bearing 5, an external tooth 111 is processed on an outer wall of the conical sleeve structure, the external tooth 111 is composed of multiple continuous arcs, the multiple continuous arcs form a corrugated structure and are used for increasing a contact area with surrounding composite materials and improving a tensile force of the blade root embedded thread insert body 11, a dovetail-shaped slot 112 is formed in the small end of the conical sleeve structure, so that the wall thickness of the inner wall of the small end can be gradually reduced, and stress concentration of glass fiber reinforced plastics around the blade tip thread insert end of the blade root embedded thread insert body 11 is prevented.
The design method of the embedded threaded sleeve of the blade root of the fan blade comprises the following steps,
1) establishing a three-dimensional model of a blade root embedded thread sleeve body 11, wherein external teeth 111 of the blade root embedded thread sleeve body 11 consist of a plurality of continuous arcs, the plurality of continuous arcs form a wavy structure, the contact area of the blade root embedded thread sleeve body 11 and surrounding composite materials can be increased, the tensile resistance is improved, the radius of a pitch circle of each arc is R, winding of glass fiber yarns is simulated on the external teeth 111 of the three-dimensional model of the blade root embedded thread sleeve body 11, and the R value corresponding to the maximum tensile resistance of the glass fiber yarns is obtained through iterative analysis calculation shown in figure 7;
wherein, the iterative analysis adopts a progressive failure theory analysis method, the specific steps are as follows,
a) defining initial conditions, establishing an initial model of a blade root embedded thread sleeve body 11, defining an initial arc radius R, simulating and winding glass fiber yarns on external teeth 111 of a three-dimensional model of the blade root embedded thread sleeve body 11, and applying boundary constraint conditions and initial loads;
b) analyzing and calculating finite element stress;
c) analyzing the stress of the wound glass fiber yarn by using a maximum stress criterion, if the glass fiber yarn is not damaged, continuing to increase the external load, continuing to analyze the stress until the glass fiber yarn is broken, and outputting the external load at the moment;
d) changing the value of the radius R of the circular arc, and carrying out calculation and analysis again in the steps a), b) and c); obtaining an R value corresponding to the maximum drawing resistance value of the blade root embedded thread sleeve body 11 in contact with the surrounding composite material through the cyclic iterative analysis;
2) as shown in fig. 8, a stress distribution diagram of the glass fiber reinforced plastic around the tip screw sleeve end of the blade root embedded screw sleeve body 11 is obtained through finite element analysis, that is, at the position of the cut-off position of the blade root embedded screw sleeve body 11, the glass fiber reinforced plastic stress is suddenly increased by 30%, the relative position 1 represents the axial length of the glass fiber reinforced plastic, and 0.5 represents at the position of half of the axial length of the glass fiber reinforced plastic, that is, at the position of the cut-off point of the blade root embedded screw sleeve body 11, aiming at the problem of stress concentration of the glass fiber reinforced plastic, a dovetail-shaped slot 112 is arranged inside the tip screw sleeve end, so that the wall thickness inside the tip screw sleeve end is gradually reduced, the local rigidity transition is smooth, the stress transition of the glass fiber reinforced plastic is uniform and smooth;
3) only the end surface of the blade root threaded sleeve end of the fan blade is contacted with the fan bearing 5, and the contact area between the common blade root embedded threaded sleeve and the fan bearing 5 is small, so that the load connection coefficient of a blade root bolt 6 matched with the blade root embedded threaded sleeve is increased; the blade root embedded thread sleeve body 11 is designed into a conical sleeve structure through finite element analysis, namely the diameter of a blade root thread sleeve end is increased, the analysis shows that when the diameter of the blade root thread sleeve end is increased by 19.4%, the contact area between the end face of the blade root thread sleeve end and the fan bearing 5 is correspondingly increased, the load connection coefficient of a blade root bolt 6 matched with the blade root embedded thread sleeve body is reduced by 8.2%, and the bearing capacity of the blade root bolt 6 is improved.
As shown in fig. 5 and 6, a specific manufacturing method of the assembly of the blade root embedded thread insert according to the embodiment includes: laying outer enhancement layer fiber cloth 2 on a blade root mould, fixing a positioning flange on the blade root mould, meshing and fixing the outer enhancement layer fiber cloth with internal threads 113 of a blade root embedded screw sleeve through a positioning screw, placing glass fiber reinforced plastic wedges 7 on the left side and the right side of the blade root embedded screw sleeve, placing a foam wedge 3 at the small end of the blade root embedded screw sleeve, finally laying inner enhancement layer glass fiber cloth 4 on the blade root embedded screw sleeve, and after the laying of the above components is finished, pouring and forming the components into a whole through a vacuum pouring process to obtain the blade root embedded screw sleeve assembly.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that variations based on the shape and principle of the present invention should be covered within the scope of the present invention.
Claims (3)
1. The utility model provides a pre-buried swivel nut of fan blade root, includes the pre-buried swivel nut body of blade root, its characterized in that: the blade root embedded thread sleeve body is of a conical sleeve structure, the small end of the conical sleeve structure is a blade tip thread sleeve end and is provided with an internal thread, the large end of the conical sleeve structure is a blade root thread sleeve end and is in contact with a fan bearing, external teeth are machined on the outer wall of the conical sleeve structure and consist of multiple continuous circular arcs, and the multiple continuous circular arcs form a wavy-line structure and are used for increasing the contact area with surrounding composite materials and improving the anti-drawing force of the blade root embedded thread sleeve body.
2. The design method of the embedded threaded sleeve of the blade root of the fan blade in claim 1 is characterized by comprising the following steps,
1) establishing a three-dimensional model of a blade root embedded thread sleeve body, wherein external teeth of the blade root embedded thread sleeve body are composed of a plurality of continuous arcs, the plurality of continuous arcs form a wavy structure, the contact area of the blade root embedded thread sleeve body and surrounding composite materials can be increased, the tensile force is improved, the radius of a pitch circle of each arc is R, glass fiber yarns are wound on the external teeth of the three-dimensional model of the blade root embedded thread sleeve body in a simulation mode, and the R value corresponding to the maximum tensile force of the glass fiber yarns is obtained through iterative analysis and calculation;
2) the stress distribution diagram of the glass fiber reinforced plastics around the tip screw sleeve end of the blade root embedded screw sleeve body is obtained through finite element analysis, and in order to solve the problem of stress concentration of the glass fiber reinforced plastics, a dovetail-shaped slot is arranged in the tip screw sleeve end, so that the wall thickness in the tip screw sleeve end is gradually reduced, the local rigidity transition is smooth, the stress transition of the glass fiber reinforced plastics is uniform and smooth, and the anti-pulling performance of the blade root embedded screw sleeve body is improved;
3) the blade root embedded screw sleeve body is designed into a conical sleeve structure through finite element analysis, namely the diameter of a blade root screw sleeve end is increased, the contact area of the end face of the blade root screw sleeve end and a fan bearing is further increased, and the load connection coefficient of a blade root bolt is reduced.
3. The design method of the embedded threaded sleeve of the blade root of the fan blade in claim 2 is characterized in that in the step 1), an iterative analysis is carried out by adopting a progressive failure theory analysis method, and the specific steps are as follows,
a) defining initial conditions, establishing an initial model of a blade root embedded thread sleeve body, defining an initial arc radius R, simulating and winding glass fiber yarns on external teeth of a three-dimensional model of the blade root embedded thread sleeve body, and applying boundary constraint conditions and initial loads;
b) analyzing and calculating finite element stress;
c) analyzing the stress of the wound glass fiber yarn by using a maximum stress criterion, if the glass fiber yarn is not damaged, continuing to increase the external load, continuing to analyze the stress until the glass fiber yarn is broken, and outputting the external load at the moment;
d) changing the value of the radius R of the circular arc, and carrying out calculation and analysis again in the steps a), b) and c); and obtaining an R value corresponding to the maximum drawing resistance value of the contact between the blade root embedded thread sleeve body and the surrounding composite material through the cyclic iterative analysis.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911036001.0A CN110778448A (en) | 2019-10-29 | 2019-10-29 | Embedded threaded sleeve for blade root of fan blade and design method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911036001.0A CN110778448A (en) | 2019-10-29 | 2019-10-29 | Embedded threaded sleeve for blade root of fan blade and design method thereof |
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| CN110778448A true CN110778448A (en) | 2020-02-11 |
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| CN201911036001.0A Pending CN110778448A (en) | 2019-10-29 | 2019-10-29 | Embedded threaded sleeve for blade root of fan blade and design method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112238566A (en) * | 2020-09-18 | 2021-01-19 | 常州市宏发纵横新材料科技股份有限公司 | Prefabricated part for wind power blade root and production method thereof |
| CN115111249A (en) * | 2022-08-02 | 2022-09-27 | 远景能源有限公司 | Embedded bolt sleeve and wind driven generator |
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