CN114263574A - Scheme for improving radial rigidity of closed ring (shell) structure by utilizing pretension - Google Patents
Scheme for improving radial rigidity of closed ring (shell) structure by utilizing pretension Download PDFInfo
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- CN114263574A CN114263574A CN202010973406.3A CN202010973406A CN114263574A CN 114263574 A CN114263574 A CN 114263574A CN 202010973406 A CN202010973406 A CN 202010973406A CN 114263574 A CN114263574 A CN 114263574A
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- shell
- pull rod
- closed ring
- tension adjusting
- adjusting device
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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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- 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
- Y02E10/728—Onshore wind turbines
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Abstract
The invention discloses a scheme for improving radial rigidity of a closed ring (shell) structure by utilizing pretension, which comprises a closed ring (shell) structural member, a pull rod, an auxiliary connecting piece and a tension adjusting device. Wherein, a plurality of connecting points are designed at proper positions in the closed ring (shell) structural member, the pull rod is connected with the tension adjusting device to form a pull rod assembly, and two ends of the pull rod assembly are arranged on the connecting points in the closed ring (shell) structural member through auxiliary connecting pieces. After all the pull rod assemblies are installed in place, the tension adjusting device is adjusted to enable the pull rods to generate pretension. Under the action of the pretension force of the pull rod, the radial rigidity of the closed ring (shell) -shaped structural part is enhanced, the stress condition is improved, the weight can be reduced, and the cost is further reduced.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a scheme for improving radial rigidity of a closed ring (shell) structure by utilizing pretension.
Background
As the capacity of the wind generating set is larger, the load of the wind generating set is larger, and the size of the bearing structural member of the wind generating set is also increased. The rigidity of closed loop (shell) structural components in the unit, such as a hub, a base, a pitch bearing, a yaw bearing, a tower drum and the like, is weak, and a large amount of materials are required to be added in the design to ensure that the strength and the rigidity meet the requirements, so that the cost is greatly increased. On the other hand, the load of the wind generating set is complex and variable, and the requirement on the bearing capacity of the closed ring (shell) structural member is high. The failure of such structural members will seriously affect the safe operation of the wind generating set. At present, the cracking phenomenon of a part of wind generating sets in operation, such as a variable pitch bearing, also happens occasionally.
The industry has considered these problems and proposed solutions. Publication number CN201381934Y proposes that a reinforcing ring plate is arranged in the hub cavity close to the mounting surface of the pitch bearing to increase the rigidity of the hub shell. Publications CN205225591U, CN205841112U, and CN207246253U all propose adding annular reinforcing plates to the end faces of the pitch bearing to increase the rigidity of the pitch bearing. The structural reinforcement part of the schemes needs to be designed to be very heavy so as to meet the requirements of design strength and rigidity, and the effect of improving the rigidity of the hub or the variable-pitch bearing is limited. Part of the scheme is also a remedial measure after the wind generating set finds problems on site.
Disclosure of Invention
Aiming at the problem that the rigidity of a closed ring (shell) structural part including a hub, a variable pitch bearing, a yaw bearing and a tower barrel in a large-capacity wind generating set is weak, the invention provides a scheme for enhancing the radial rigidity of the closed ring (shell) structural part by utilizing a plurality of rod pieces with pretension. By adopting the scheme of the invention, the radial rigidity and the strength of the closed ring (shell) structural member in the wind turbine generator can be enhanced, the operation is simple, the weight increase is less, and even the weight of the structural member can be integrally reduced, so that the cost is reduced. The scheme of the invention is as follows.
The invention comprises at least the following components: closed ring (shell) shaped structural member, pull rod, auxiliary connecting piece and tension adjusting device.
The closed ring (shell) structural part can be a closed ring-shaped or shell-shaped structural part such as a hub, a variable pitch bearing, a base, a yaw bearing, a tower drum and the like. And a plurality of connecting points are arranged in the closed ring (shell) structural member according to the actual bearing condition.
The pull rods are connected through the tension adjusting devices to form pull rod assemblies, and two ends of the pull rod assemblies are connected with corresponding connection points in the closed ring (shell) structural member through the auxiliary connecting pieces. The pull rod can be designed into various length specifications according to specific requirements.
The tension adjusting device can be an independent component, and can also be integrated with the auxiliary connecting piece to form a component with connecting and adjusting functions. The adjustment mode of the tension adjusting device includes but is not limited to screw thread adjustment.
After all the pull rod assemblies are installed in the closed ring (shell) structural member, the pull rods in the pull rod assemblies generate pre-tensioning force by adjusting the tension adjusting device, and the pre-tensioning force is transmitted to the connecting points in the closed ring (shell) structural member.
The closed ring (shell) structural member deforms from a circular ring (spherical shape) to a non-circular ring (spherical shape) under the action of external load, and the pull rod has the tendency of keeping the closed ring (shell) structural member in the original circular ring (spherical shape) under the action of pretension, so that the deformation of the closed ring (shell) structural member under the action of the external load is reduced. Further, the radial rigidity of the closed ring (shell) structural member is enhanced, and the stress condition of the closed ring (shell) structural member is improved. Compared with the conventional scheme, the closed ring (shell) structural part can meet the requirements of strength and rigidity by using less materials under the same external load condition, thereby reducing the cost. In addition, in the loading process, the pull rod is always under tension without the phenomenon of pressure instability, the tensile strength of the rod piece is strong, and the size specification of the pull rod does not need to be too large, so that the cost increase caused by the introduction of accessories in the scheme of the invention is limited.
The invention has the beneficial effects that: and reasonably arranging connecting points according to the external loading condition in the closed ring (shell) structural member, and installing a pull rod assembly on the connecting points. The tension adjusting device applies pretension force to the pull rod to strengthen the radial rigidity of the closed ring (shell) structural member and improve the stress condition of the closed ring (shell) structural member. The scheme is simple to realize, and the cost reduction effect is obvious.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is an assembly drawing of the inventive solution.
FIG. 2 is a schematic view of a tie rod assembly according to the present invention.
In the figure: 1-closed annular structural part, 2-pull rod assembly, 2.1-pull rod, 2.2-pull rod, 2.3-tension adjusting device and 3-auxiliary connecting piece.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. The invention provides a scheme for improving the radial rigidity of a closed ring (shell) structure by utilizing pretension, and a preferred embodiment of the scheme is as follows.
Six connecting points are arranged in the closed annular structural part 1 according to the actual loading condition. The pull rod 2.1 and the pull rod 2.2 are connected through a tension adjusting device 2.3 to form a pull rod assembly 2. The connecting end of the pull rod 2.1 and the tension adjusting device 2.3 is provided with left-handed threads, and the connecting end of the pull rod 2.2 and the tension adjusting device 2.3 is provided with right-handed threads; the tension adjusting device 2.3 is provided with threads with corresponding screwing directions so as to be matched with the pull rod 2.1 and the pull rod 2.2. Two ends of each pull rod assembly 2 are connected with corresponding connecting points in the closed annular structural member 1 through auxiliary connecting pieces 3. After all the pull rod assemblies 2 are mounted in place, the pretension force of the pull rods 2.1 and 2.2 can be adjusted by rotating the tension adjusting device 2.3 and transmitted to the connection points in the closed annular structural member 1.
The closed annular structural member 1 deforms from a circular shape to a non-circular shape under the action of external load, and the pull rod 2.1 and the pull rod 2.2 have the tendency of keeping the closed annular structural member 1 in the original circular shape under the action of pretension, so that the deformation of the closed annular structural member 1 under the action of the external load is reduced. Further, the radial rigidity of the closed annular structural member 1 is enhanced, and the stress condition is improved. The closed annular structural component 1 with the structural scheme under the same external load working condition and bearing requirement uses less materials than the conventional closed annular structural component, so that the cost can be reduced.
In addition, the pull rod 2.1 and the pull rod 2.2 are always pulled, so that the instability phenomenon cannot occur, the compression strength of the rod piece is high, and the size specifications of the pull rod 2.1 and the pull rod 2.2 do not need to be too large, so that the cost increase brought by the accessory pull rod 2.1, the pull rod 2.2, the pull force adjusting device 2.3 and the auxiliary connecting piece 3 introduced by the scheme of the invention is limited. The whole scheme has large integral cost reduction space and improved bearing capacity.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (5)
1. The scheme for improving the radial rigidity of the closed ring (shell) structure by utilizing the pretension is characterized in that: at least comprises a closed ring (shell) structural member, a pull rod, an auxiliary connecting piece and a tension adjusting device.
2. Closed-loop (shell) -like structure according to claim 1, characterized in that: and a plurality of pull rod connecting points are arranged at proper positions in the closed ring (shell) structural member.
3. The tie rod of claim 1, wherein: the pull rod is connected with the tension adjusting device to form a pull rod assembly.
4. A solution for increasing the radial stiffness of a closed loop (shell) like structure with pretension according to claim 1 and claim 3, characterized in that: two ends of a plurality of pull rod assemblies are arranged on each pull rod connecting point in the closed ring (shell) structural member through the auxiliary connecting piece, and the pull rods generate pre-tensioning force by adjusting the tension adjusting device.
5. The tension adjusting device according to claim 1, wherein: the tension adjusting device can be an independent component, and can also be integrated with the auxiliary connecting piece into a component with tension adjusting and connecting functions; the adjustment mode of the tension adjusting device includes but is not limited to screw thread adjustment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010973406.3A CN114263574A (en) | 2020-09-16 | 2020-09-16 | Scheme for improving radial rigidity of closed ring (shell) structure by utilizing pretension |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010973406.3A CN114263574A (en) | 2020-09-16 | 2020-09-16 | Scheme for improving radial rigidity of closed ring (shell) structure by utilizing pretension |
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| Publication Number | Publication Date |
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| CN114263574A true CN114263574A (en) | 2022-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010973406.3A Pending CN114263574A (en) | 2020-09-16 | 2020-09-16 | Scheme for improving radial rigidity of closed ring (shell) structure by utilizing pretension |
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| CN (1) | CN114263574A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114738439A (en) * | 2022-04-13 | 2022-07-12 | 同济大学 | Vibration damper for cooling tower |
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2020
- 2020-09-16 CN CN202010973406.3A patent/CN114263574A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114738439A (en) * | 2022-04-13 | 2022-07-12 | 同济大学 | Vibration damper for cooling tower |
| CN114738439B (en) * | 2022-04-13 | 2024-03-22 | 同济大学 | Vibration damper for cooling tower |
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