Frame type rotating shaft and wind turbine generator
The frame-type shaft design solves the problems of shaft material consumption and wind resistance in vertical-axis wind turbines, achieves lightweight and efficient wind energy utilization, and improves the structural bending, torsional stiffness and fatigue strength.
Patent Information
- Application Number
- CN202422143315.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-09-02
AI Technical Summary
When increasing the power and anti-bending and anti-torsion capabilities of the rotating shaft of the existing vertical axis wind turbine, it leads to increased wind resistance, increased material consumption and increased costs, while also affecting the aerodynamic performance of the impeller and the tower shadow effect.
A frame-type shaft design is adopted, with multiple shaft units forming cross nodes and intermediate support structures to form a stable frame structure, reducing wind resistance and improving bending and torsional rigidity.
It reduces material usage and weight, reduces wind resistance, improves the wind energy utilization efficiency of the impeller, reduces the cost of the impeller and tower, and improves the fatigue strength of the structure.
Smart Images
Figure CN223344186U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wind power generation, and particularly relates to a frame-type rotating shaft and a wind turbine generator set. Background Art
[0002] Wind power is the most promising power generation method in the renewable energy field with the greatest large-scale development value and commercial development prospects. Available wind energy is widely distributed around the world and has huge reserves.
[0003] While vertical-axis wind turbines have a long history, they have fallen out of mainstream use with the rapid development of horizontal-axis wind turbines. However, due to their lack of a yaw system, low noise levels, and simpler structure, vertical-axis wind turbines, as small and medium-sized wind turbines, remain popular in distributed wind power projects and residential wind power equipment markets.
[0004] The majority of current vertical-axis wind turbine rotor configurations employ blades secured to a rotating shaft via connecting rods, with the shaft rotating relative to a fixed axis via bearings. Both the rotating and fixed shafts are typically constructed from hollow tubes. As blades increase, the length of the rotating and fixed shafts also increases. Furthermore, as turbine power increases, the cross-sectional dimensions and thickness of the rotating and fixed shafts also need to be increased to improve bending and torsional resistance. While thickening and thickening the rotating shaft can improve its load-bearing capacity, this simple design presents two key issues: 1) Due to the operating characteristics of vertical-axis wind turbines, at any given moment, some blades will inevitably be located downwind of the rotating shaft. This means that wind first passes over the upwind blades, then over the rotating shaft, and finally reaches the downwind blades. Consequently, an excessively large rotating shaft cross-sectional area can significantly impact the downwind blades, compromising the aerodynamic performance of the entire rotor and causing a certain degree of "tower shadow effect" in vertical-axis wind turbines. 2) An excessively large shaft cross-sectional area increases wind resistance on the shaft, placing greater bending and thrust loads on components such as the bearings and the tower below, leading to increased specifications for load-bearing components. 3) To ensure the shaft's load-bearing capacity, increased cross-sectional area and thickness result in increased shaft material, which in turn increases costs.
[0005] Therefore, it is necessary to provide a new vertical axis wind turbine shaft that has the characteristics of low wind resistance and low material consumption while ensuring bending and torsional resistance. Utility Model Content
[0006] In order to solve at least one of the above technical problems, a first aspect provides a frame-type rotating shaft, which includes a plurality of rotating shaft units, wherein the rotating shaft units are composed of a flange connecting section and an intermediate connecting section;
[0007] The two intermediate connecting sections are arranged crosswise to form an intersection node, the intermediate connecting section includes a first end and a second end, the first ends of the two intermediate connecting sections and the end of the flange connecting section together constitute the bending point of the rotating shaft unit, or the first ends of the two intermediate connecting sections and the end of the flange connecting section are connected to form the rotating shaft unit;
[0008] The plurality of rotating shaft units are divided into a first group and a second group of rotating shaft units, the number of rotating shaft units in the first group and the number of rotating shaft units in the second group are the same, and the number of rotating shaft units in each group is at least three;
[0009] The flange connection section of the first group of rotating shaft units is arranged in parallel with the flange connection section of the second group of rotating shaft units, and the second end of the intermediate connection section in the first group of rotating shaft units is connected to the second end of the intermediate connection section in the second group of rotating shaft units via a connecting member, or the intermediate connection section of the first group of rotating shaft units and the intermediate connection section of the second group of rotating shaft units together form an integrated structure;
[0010] The first group of rotating shaft units and the second group of units are arranged around the rotation axis of the frame type rotating shaft to form a frame type rotating shaft;
[0011] The frame-type rotating shaft also includes an intermediate support member connection. In the first group of rotating shaft units, the intersection nodes of adjacent rotating shaft units are connected through the intermediate support member; in the second group of rotating shaft units, the intersection nodes of adjacent rotating shaft units are connected through the intermediate support member.
[0012] In a second aspect, a wind turbine is provided, comprising an impeller, a generator and a tower;
[0013] The impeller comprises a frame-type rotating shaft as described in the first aspect;
[0014] The impeller further comprises two flanges, at least two blades and a plurality of blade connecting rods;
[0015] The flange is connected to the two axial ends of the frame-type rotating shaft, and the blade is connected to the flange via the blade connecting rod;
[0016] One of the flanges is connected to the generator, and the generator is connected to the tower.
[0017] In a further technical solution, the flange is connected to the flange connection section located at the end of the frame-type rotating shaft.
[0018] In a further technical solution, the position where the flange plate is connected to the flange connecting section is a flange connecting position, and the flange connecting positions are evenly distributed on the flange plate around the axis of the frame-type rotating shaft.
[0019] In a further technical solution, the position where the blade connecting rod is connected to the flange is located between two adjacent flange connection positions.
[0020] Each blade is connected to the two flanges simultaneously through at least two blade connecting rods.
[0021] The frame-type rotating shaft is also provided with an auxiliary support structure, and the auxiliary support member is composed of a plurality of auxiliary support members connected together.
[0022] In a further technical solution, the auxiliary support member is connected to the second ends of two adjacent intermediate connecting sections in the frame-type rotating shaft.
[0023] One of the flanges is connected to the generator rotor, and the frame-type rotating shaft and the generator rotor rotate coaxially.
[0024] In a further technical solution, the generator stator is connected to the top of the tower, and the generator rotor rotates relative to the generator stator through at least one set of bearings.
[0025] The beneficial effects of the present invention are as follows: compared to the rotating shafts currently used in vertical-axis wind turbines, the frame-type rotating shaft proposed in this solution uses less material and is lightweight, which can reduce the cost of the impeller and tower. Due to its frame-type structure, the wind resistance cross-section is small, and the wind speed acting on the downwind blades is less attenuated, greatly improving the impeller's utilization of wind energy. Furthermore, its unique shape ensures good bending and torsional rigidity and strength, and the load generated during the operation of the impeller causes less structural deformation, thereby improving the fatigue strength of the structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is a schematic diagram of a frame-type rotating shaft unit according to an embodiment of the present utility model;
[0027] Figure 2 This is a schematic diagram of the axial side of a frame-type rotating shaft unit component according to an embodiment of the present utility model;
[0028] Figure 3 This is a schematic diagram of a first connection method of a frame-type rotating shaft unit component according to an embodiment of the utility model;
[0029] Figure 4 This is a schematic diagram of a second connection method of a frame-type rotating shaft unit component according to an embodiment of the utility model;
[0030] Figure 5 This is a schematic diagram of the axial side of a frame-type rotating shaft according to an embodiment of the present utility model;
[0031] Figure 6 This is an axonometric diagram of a wind turbine generator set according to an embodiment of the present utility model;
[0032] Figure 7 This is a top view of a wind turbine generator set according to an embodiment of the present utility model;
[0033] Figure 8 This is a partial schematic diagram of the shaft side of a wind turbine generator set according to an embodiment of the present utility model.
[0034] Description of Figure Numbers:
[0035] 1. Rotating shaft unit component, 1.1. Flange connection section, 1.2. Intermediate connecting section, 1.21. First end of the intermediate connecting section, 1.22. Second end of the intermediate connecting section, 1.3. Cross node, 2. First group of rotating shaft unit components, 3. Second group of rotating shaft unit components, 4. Rotation axis, 5. Intermediate support member, 6. Flange plate, 7. Blade, 8. Blade connecting rod, 9. Generator, 9.1. Generator rotor, 9.2. Generator stator, 10. Tower, 11. Auxiliary support structure, 11.1. Auxiliary support member.
[0036] It is important to note that the figures above are intended to illustrate the features of the present invention and are not intended to depict any actual structure or reflect detailed information such as the dimensions, relative proportions, or other details of the various components. To more clearly demonstrate the principles of the present invention and to avoid obscuring the principles of the present invention with unnecessary detail, the examples in the figures have been simplified. These illustrations will not cause difficulty for those skilled in the relevant art in understanding this patent, and actual embodiments may include additional modules or components. DETAILED DESCRIPTION
[0037] To make the purpose and technical solution of the embodiments of the present invention clearer, the following is a complete description of the embodiments of the present invention in conjunction with the relevant drawings of the embodiments of the present invention. This patent describes only some embodiments, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this utility model.
[0038] An embodiment of a frame-type rotating shaft
[0039] The frame type shaft is mainly composed of multiple Figure 1 and Figure 2 The rotating shaft unit component (1) shown is composed of two parts: a flange connection section (1.1) and an intermediate connection section (1.2).
[0040] Two intermediate connecting segments (1.2) are arranged in a cross shape to form a cross node (1.3). The two ends of the intermediate connecting segment (1.2) are respectively the first end (1.21) and the second end (1.22). The first ends (1.21) of the two intermediate connecting segments and the end of the flange connecting segment (1.1) together form the bending point of the rotating shaft unit (1). The entire rotating shaft unit (1) forms a "fork" - shaped structure. Here, the meaning that the first ends (1.21) of the two intermediate connecting segments and the end of the flange connecting segment (1.1) together form the bending point of the rotating shaft unit (1) is that the two intermediate connecting segments (1.2) and the flange connecting segment (1.1) are formed by bending a complete profile at the bending point (a total of two bends). There is another possible manufacturing method for the rotating shaft unit (1) to form a "fork" - shaped structure: the first ends (1.21) of the two intermediate connecting segments and the end of the flange connecting segment (1.1) are connected (such as by welding). In the above method, manufacturing the rotating shaft unit (1) by bending a complete profile at the bending point maintains the integrity of the material and the fatigue strength of the structure is better.
[0041] The multiple rotating shaft units (1) are divided into a first group (2) and a second group of rotating shaft units (3). The number of the first group of rotating shaft units (2) and the second group of rotating shaft units (3) is the same, and the number of each group is at least three. In this embodiment, the number of the first group of rotating shaft units (2) and the second group of rotating shaft units (3) is three. In other embodiments, the number of the rotating shaft units (1) can be appropriately increased according to the requirements such as the bearing capacity of the rotating shaft and the radial dimension of the rotating shaft.
[0042] The flange connecting segments (1.1) of the first group of rotating shaft units (2) are arranged in parallel with the flange connecting segments (1.1) of the second group of rotating shaft units (3). And the second ends (1.22) of the intermediate connecting segments of the first group of rotating shaft units (2) are connected to the second ends (1.22) of the intermediate connecting segments of the second group of rotating shaft units (3) through a connecting member, or the intermediate connecting segments (1.2) of the first group of rotating shaft units (2) and the intermediate connecting segments (1.2) of the second group of rotating shaft units (3) together form an integral structure. Such as Figure 3 and Figure 4As shown, there are two topological structures when the second end (1.22) of the middle connecting section of the first group of rotating shaft units (2) is connected to the second end (1.22) of the middle connecting section of the second group of rotating shaft units (3): 1) the second ends (1.22) of the middle connecting sections of the two adjacent first group of rotating shaft units (2) are connected to each other; 2) the second ends (1.22) of the middle connecting sections of the two adjacent first group of rotating shaft units (2) are not connected to each other, but are only connected to the second end (1.22) of the middle connecting section of the second group of rotating shaft units (3). The above two topological structures may appear in the embodiments, and can be selected according to the requirements such as the load-bearing capacity of the rotating shaft and the axial size of the rotating shaft. It is worth noting that in this embodiment, the second end (1.22) of the middle connecting section of the first group of rotating shaft units (2) and the second end (1.22) of the middle connecting section of the second group of rotating shaft units (3) are connected by a connecting piece. In some other embodiments, the connection can also be formed by welding or even as shown in FIG. Figure 3 and 4 The multiple rotating shaft units (1) shown can also be formed by bending a complete profile.
[0043] like Figure 5 As shown, the first group of rotating shaft units (2) and the second group of rotating shaft units are arranged around the rotation axis (4) of the frame type rotating shaft to form a frame type rotating shaft. The frame type rotating shaft further includes an intermediate support member (5) for connection. In the first group of rotating shaft units (2), the intersection nodes (1.3) of adjacent rotating shaft units (1) are connected through the intermediate support member (5). In the second group of rotating shaft units (3), the intersection nodes (1.3) of adjacent rotating shaft units (1) are connected through the intermediate support member (5).
[0044] The novelties and advantages of the above technical solution are:
[0045] a) The frame-type shaft has a special spatial structure composed of multiple identical shaft units (1), forming a large number of triangular structures. This structure forms a stable structure based on the load characteristics of the shaft of the vertical axis wind turbine.
[0046] b) Compared with the existing cylindrical structure, the frame-type rotating shaft has a smaller wind resistance, which is conducive to the air flow acting on the blades in the downwind direction, and better improves the wind energy utilization efficiency of the vertical axis wind turbine impeller.
[0047] c) Compared with the existing cylindrical structure, the frame-type shaft uses much less material, the overall weight is lighter, and the gravity load on the generator and tower below the vertical axis wind turbine rotor is reduced.
[0048] d) Although the frame-type shaft has a hollow structure and uses less material, it has good effective bending and torsional rigidity, which reduces the deformation of the impeller when loaded and ensures the fatigue strength of the unit.
[0049] An embodiment of a wind turbine generator set
[0050] like Figure 6 As shown, the wind turbine mainly consists of an impeller, a generator (9) and a tower (10). The impeller includes the aforementioned frame-type rotating shaft, two flanges (6), three blades (7) and a plurality of blade connecting rods (8).
[0051] The flange (6) is connected to the two axial ends of the frame-type rotating shaft, and the blade (7) is connected to the flange (6) through the blade connecting rod (8). The flange (6) at the bottom is connected to the generator (9), and the generator (9) is connected to the tower (10).
[0052] Specifically, such as Figure 7 As shown, the flange (6) is connected to the flange connection section (1.1) located at the end of the frame-type rotating shaft. The position where the flange (6) is connected to the flange connection section (1.1) is the flange connection position. The flange connection positions are evenly distributed on the flange (6) around the axis of the frame-type rotating shaft (that is, the rotation axis of the impeller), that is, the flange connection positions can divide the flange (6) into three sections. Each blade (5) is connected to two flanges (6) at the same time through two blade connecting rods (8). In this embodiment, Figure 6 As shown, two blade connecting rods (8) are horizontally arranged between the blades (7) and the flange (6). The position where the blade connecting rod (8) is connected to the flange (6) is located between two adjacent flange connection positions. In this embodiment, the number of blades (7) and the flange connection section (1.1) are both three, so the position where the blade connecting rod (8) is connected to the flange (6) can be approximately considered to be located in the middle of the two adjacent flange connection positions. If the number of blades (7) in other embodiments is two or four or more, the position where the blade connecting rod (8) is connected to the flange (6) can be adjusted according to actual needs, but it is still located between the two adjacent flange connection positions.
[0053] like Figure 6 indivual Figure 8 As shown, in this embodiment, the frame-type rotating shaft is further provided with an auxiliary support structure (11), which is composed of a plurality of auxiliary support members (11.1) connected together. The auxiliary support members (11.1) are connected to the second ends (1.22) of two adjacent intermediate connecting sections (1.2) in the frame-type rotating shaft. The addition of the auxiliary support structure (11) can further enhance the rigidity of the frame-type rotating shaft, and is particularly suitable for embodiments in which the rotating shaft has a long axial length.
[0054] A flange (6) is connected to the generator rotor (9.1), and the frame shaft and the generator rotor (9.1) rotate coaxially. The generator stator (9.2) is connected to the top of the tower (10), and the generator rotor (9.1) rotates relative to the generator stator (9.2) through at least one set of bearings.
[0055] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up, down, front, back, left and right" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as a limitation on the present invention.
[0056] Unless otherwise specified or limited, the terms "mounted, connected, and connected" in this utility model should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection. They can also refer to mechanical connection, electrical connection, direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0057] While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.
Claims
1. A frame-type rotating shaft, characterized in that: Comprising a plurality of rotating shaft units (1), the rotating shaft units (1) are composed of a flange connection section (1.1) and an intermediate connection section (1.2); The two intermediate connecting sections (1.2) are arranged crosswise to form a cross node (1.3); the intermediate connecting section (1.2) comprises a first end (1.21) and a second end (1.22); the first ends (1.21) of the two intermediate connecting sections and the end of the flange connecting section (1.1) together constitute a bending point of the rotating shaft unit (1); or the first ends (1.21) of the two intermediate connecting sections and the end of the flange connecting section (1.1) are connected to form the rotating shaft unit (1); The plurality of rotating shaft units (1) are divided into a first group and a second group of rotating shaft units (3), the number of the first group of rotating shaft units (2) and the number of the second group of rotating shaft units (3) are the same, and the number of each group is at least three; The flange connection section (1.1) of the first group of rotating shaft units (2) and the flange connection section (1.1) of the second group of rotating shaft units (3) are arranged in parallel, and the second end (1.22) of the intermediate connection section in the first group of rotating shaft units (2) and the second end (1.22) of the intermediate connection section in the second group of rotating shaft units (3) are connected via a connecting piece, or the intermediate connection section (1.2) of the first group of rotating shaft units (2) and the intermediate connection section (1.2) of the second group of rotating shaft units (3) together form an integrated structure; The first group of rotating shaft units (2) and the second group of units are arranged around the rotation axis (4) of the frame-type rotating shaft to form a frame-type rotating shaft; The frame-type rotating shaft further includes an intermediate support member (5) for connection, wherein in the first group of rotating shaft units (2), the intersection nodes (1.3) of adjacent rotating shaft units (1) are connected via the intermediate support member (5); and in the second group of rotating shaft units, the intersection nodes (1.3) of adjacent rotating shaft units (1) are connected via the intermediate support member (5).
2. A wind turbine generator system, characterized in that: including an impeller, a generator (9) and a tower (10); The impeller comprises a frame-type rotating shaft as described in claim 1; The impeller further comprises two flanges (6), at least two blades (7) and a plurality of blade connecting rods (8); The flange (6) is connected to the two axial ends of the frame-type rotating shaft, and the blade (7) is connected to the flange (6) via the blade connecting rod (8); One of the flanges (6) is connected to the generator (9), and the generator (9) is connected to the tower (10).
3. A wind turbine according to claim 2, characterized in that: The flange (6) is connected to the flange connection section (1.1) located at the end of the frame-type rotating shaft.
4. A wind turbine generator set according to claim 3, characterized in that: The position where the flange (6) is connected to the flange connection section (1.1) is a flange connection position, and the flange connection positions are evenly distributed on the flange (6) around the axis of the frame-type rotating shaft.
5. A wind turbine generator set according to claim 4, characterized in that: The position where the blade connecting rod (8) is connected to the flange (6) is located between two adjacent flange connection positions.
6. A wind turbine generator set according to claim 2, characterized in that: Each blade (7) is simultaneously connected to the two flanges (6) via at least two blade connecting rods (8).
7. A wind turbine generator set according to claim 2, characterized in that: The frame-type rotating shaft is further provided with an auxiliary support structure (11), and the auxiliary support structure (11) is composed of a plurality of auxiliary support members (11.1) connected together.
8. A wind turbine generator set according to claim 7, characterized in that: The auxiliary support member (11.1) is connected to the second ends (1.22) of two adjacent middle connecting sections in the frame-type rotating shaft.
9. A wind turbine generator set according to claim 2, characterized in that: One of the flanges (6) is connected to the generator rotor (9.1) of the generator (9), and the frame-type rotating shaft and the generator rotor (9.1) rotate coaxially.
10. A wind turbine generator set according to claim 9, characterized in that: The generator stator (9.2) of the generator (9) is connected to the top of the tower (10), and the generator rotor (9.1) rotates relative to the generator stator (9.2) through at least one set of bearings.