CN116428116A - Support system for metal wind power blade - Google Patents

Abstract

A supporting system of a metal wind power blade comprises a blade body and a hub connected with the blade body, wherein a front support is arranged on the hub; and a diagonal brace is arranged between the front brace and the leaf framework of the leaf body, and a straight brace is connected between the diagonal brace and the leaf framework. The invention can keep the wind wheel in a balanced state of uniform stress all the time, and can keep the leaf stem part free from bending and fatigue no matter the wind wheel is subjected to strong wind or forward and reverse wind, and the mechanical property is obvious.

Description

A support system for metal wind turbine blades

technical field

The invention relates to the technical field of wind power generation, in particular to a support system for metal wind power blades.

Background technique

A wind power generator mainly includes a tower, a generator, a hub and an impeller, wherein the impeller includes a plurality of blades. Existing fan blades will be fatigued during 360° rotation, because they will be subjected to two forces of tension and compression during the rotation process, and once fatigued, the structural strength will be greatly reduced. Moreover, when the existing wind rotor is subjected to forward and reverse wind force, wind shear or local wind turbulence, the blades will be excessively bent or even broken, which greatly reduces the service life.

The applicant of the present invention also successively applied for a series of wind power blade structures before this application, including setting a front brace at the front end of the hub, setting a diagonal brace and a stay rope between the front brace and the stem of the blade, but the inventor did not In follow-up tests, it was found that the effect of bending resistance and fatigue resistance of this structure was not significant, and the wind rotor could not always maintain a balanced state of uniform force, especially when subjected to positive and negative wind forces, it was prone to bending and fatigue, exceeding the load stress. Therefore, the present invention urgently needs to design a kind of supporting system to solve above-mentioned defect.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and provide a support system for metal wind power blades with remarkable bending and fatigue resistance, uniform force, less consumable materials and low cost.

The technical solution of the present invention is: a support system for metal wind power blades, including a blade body and a hub connected to the blade body, a front brace is provided on the hub; a diagonal brace is provided between the front brace and the blade frame of the blade body , a straight brace is connected between the diagonal brace and the leaf skeleton.

Further, a stay rope is provided between the diagonal brace and the leaf frame.

Further, a stay rope is provided between the diagonal brace and the hub.

Further, one end of the stay rope is connected to the leaf frame or the hub, and the other end is connected between the diagonal brace and the straight brace.

Further, the oblique stay rope is fixed on the connecting seat of the leaf frame, and the connecting seat is provided with a slanted hole for passing through the screw sleeve. One end of the screw sleeve is obliquely fixed on the connecting base through a nut, and the other end is connected to the oblique stay rope.

Further, the braces are formed by connecting a plurality of rods through flange seats. When the hub is connected to multiple blade bodies, a brace stay rope is provided between the braces of each blade body; One end of the screw sleeve is obliquely fixed on the flange seat through a nut, and the other end is connected with a diagonal stay rope.

Further, the diagonal brace is a rod body, and the straight brace is a truss structure.

Further, the blade body is formed by splicing multiple segments of fan blades, the leaf skeleton is the leaf stem part, which is arranged in the inner cavity of the fan blade, and the root end of the leaf stem part extends out to connect with the hub; The leaf-stem connecting seat is connected with the leaf-stem part, and the leaf-stem connecting seat is arranged at the splicing place of adjacent wind blades; the oblique stay rope and at least one straight support are connected to the structure extending from the leaf-stem part.

Further, at least two straight braces are arranged between the diagonal brace and the leaf skeleton, and the straight braces are vertically arranged to the leaf skeleton.

Further, the front brace is also connected with a front stay rope, the other end of the front stay rope is connected to the leaf skeleton, and the angle between the front stay rope and the leaf skeleton is smaller than the angle between the diagonal brace and the leaf skeleton; The angle between the brace and the leaf skeleton is not greater than 30°.

Beneficial effects of the present invention: by setting the diagonal brace and the straight brace, the bending of the blade body can be prevented, so that it can always form an overall optimal and uniform stress; and the diagonal brace is a rod structure, and the straight brace is a truss structure, which can On the basis of saving steel, it can also greatly improve the bending strength and ensure the stable operation of the wind rotor under strong winds; through the interaction of diagonal braces, straight braces and cable stays, the blade body can be kept under the action of braces and pulls. There will be transitional bending and fatigue, and the wind wheel will always form a balanced state of uniform force, and there will be no stress problem exceeding the load; by setting the front pull rope and combining it with the front support and straight support, it can save consumables on the basis of In addition, it can also greatly improve the overall fatigue resistance of the leaf stem, coupled with the diagonal bracing rope, can greatly improve the overall operation stability of the wind wheel, whether it is subjected to strong wind or positive and negative wind, it can maintain the leaf stem. Bending and fatigue will not occur, and the mechanical properties are remarkable.

Description of drawings

Fig. 1 is the structural representation of the wind wheel of the embodiment of the present invention;

Fig. 2 is a schematic structural view of the connection between the diagonal brace and the straight brace according to the embodiment of the present invention;

Fig. 3 is the enlarged schematic diagram of the structure of the straight support of the embodiment of the present invention;

Fig. 4 is the concrete connection schematic diagram of oblique stay rope and diagonal stay stay rope of the embodiment of the present invention;

Fig. 5 is a schematic diagram of the connection structure of the front end of the front support according to the embodiment of the present invention;

Fig. 6 is a schematic diagram of the connecting structure of the braced flange according to the embodiment of the present invention.

Explanation of the accompanying drawings:

1. Blade body; 2. Wheel hub; 3. Front support; 4. Diagonal support; 5. Straight support; 6. Diagonal stay rope; 7. Screw sleeve; 8. Front stay rope; Shell; 12. Leaf stem; 31. Extension rod; 32. Pull cord connection seat; 41. Diagonal bracing flange; 51. Tilting rod; 52. Connecting rod;

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 3: a support system for metal wind power blades, including a blade body 1 and a hub 2 connected to the blade body, the hub 2 is provided with a front brace 3; Diagonal braces 4 are arranged between the skeletons, and straight braces 5 are connected between the diagonal braces 4 and the leaf skeleton.

The above scheme has the following advantages: by combining the diagonal brace and the straight brace, the bending of the blade body can be prevented, so that it always forms an overall optimal and uniform force; because the wind rotor will encounter reverse wind force during rotation , due to the large diameter of the wind rotor, when the blade body is subject to both positive and reverse wind forces during a certain period of time, or when a part of the wind rotor is subject to positive wind force and the other part is subject to reverse wind force, such as wind Shear or local wind turbulence, through the combination of diagonal braces and straight braces, can prevent excessive bending of each blade body. If only diagonal braces are set, there is still a risk of bending. By adding straight braces, this phenomenon will be avoided.

In this embodiment, there are multiple blade bodies 1 of a wind power generator, usually 2 to 6, which are connected with the hub 2 to form a wind rotor. Wherein, the blade body 1 includes a leaf skeleton and a casing 11, wherein the leaf skeleton is a leaf stem portion 12, and the leaf stem portion 12 is a truss structure, the casing 11 is spliced by multiple sections of wind blades to form a large-scale structure, and the leaf stem portion 12 is connected to The inner cavity of the casing 11 , and the blade root end of the blade stem portion 11 extends out, and is connected with the hub 2 . One end of the diagonal brace 4 is connected to the hub 2, and the other end is connected to the leaf stem 12, and the angle between the diagonal brace 4 and the leaf stem 12 is not more than 30°, more preferably 10 to 20°, so that the diagonal brace can be The setting is longer, that is, the diagonal brace is connected to the position of 1/3~2/3 of the fan blade body, which can ensure that the diagonal brace has enough supporting force to make the leaf stem evenly stressed without bending. Large, the brace is too short, because the leaf stem has a certain length, it will lead to poor stability, and it is easy to shake under strong wind, increasing the risk of bending.

In addition, since the connection between the brace 4 and the blade stem 12 is covered by the shell of the blade body, it cannot be directly connected to the blade stem. Therefore, the present invention realizes The connection with the diagonal brace 4, that is, the connection between the leaf stem connection seat and the leaf stem part 12, and a gap is provided on each fan blade shell at the joint of the adjacent fan blades, so that the leaf stem connection seat is exposed along the gap, and connected with the diagonal brace 4 threaded connection.

In this embodiment, the diagonal brace 4 is a rod structure, and the straight brace 5 is a truss structure. This setting structure can save steel on the one hand, if the diagonal brace 4 is set as a truss structure, due to the long length of the diagonal brace, not only will it consume steel, but also the structure is complicated and the assembly is complicated; on the other hand, the straight brace 5 is designed as The truss structure can improve the bending strength, and the straight brace itself is short, so the consumables are less and the cost is greatly reduced. It can be said that the combination structure of the present invention can greatly improve the bending strength on the basis of saving steel materials, and ensure the stable operation of the wind rotor under strong wind.

As shown in Figure 5: in this embodiment, the front end of the front support 3 of the hub is provided with an extension rod 31 extending outwards, the number of the extension rod is the same as the number of the blade body, and is used to connect with the diagonal brace 4 of each blade body. Make flange connections.

In this embodiment, the number of straight braces corresponding to each blade body 1 is preferably 2 to 4, which can be determined according to the length of the diagonal braces. For example, there are two straight supports 5 in this embodiment, and the straight supports 5 are vertically arranged with the leaf stem part 12 . Preferably, the straight brace 5 is a triangular truss structure, and the leaf stem part 12 is also a triangular truss structure. The straight brace 5 is mainly composed of two inclined rods 51 and a plurality of connecting rods 52 arranged between the inclined rods. The leaf stem part 12 It is formed by splicing multi-section trusses, and the multi-section trusses are connected by stem flanges 121 . Wherein the two inclined rods 51 straightly supported are threadedly connected between the blade stem flange 121 of a certain adjacent section of the blade stem through a connecting plate. The diagonal brace is formed by splicing multi-section rod bodies through the diagonal brace flange 41, and the other ends of the two inclined rods of the straight brace 5 are threaded with the diagonal brace flange 41 on the diagonal brace through a connecting plate. The two straight supports 5 in this embodiment are all connected to the part of the truss extending from the leaf stem.

As shown in Figure 4: in this embodiment, a diagonal stay rope 6 is provided between the diagonal brace 4 and the leaf stem 12, and a diagonal stay rope 6 is also provided between the diagonal brace 4 and the hub 2, and the diagonal stay rope 6 One end is connected to the leaf stem or the hub, and the other end is connected between the diagonal brace and the straight brace. By arranging the oblique stay ropes, since the oblique stay ropes are stressed in one direction, the wind rotor can always be in the state of being tensioned by the oblique stay ropes during operation, without positive and negative fatigue. In addition, through the interaction between the oblique stay ropes, diagonal braces and straight braces, the blade body will not experience excessive bending and fatigue under the action of braces and pulls, and the wind wheel will always form a balanced state of uniform force, and will not appear Stress problems with excess loads.

In this embodiment, a plurality of stay ropes 6 are connected between the straight brace 5 and the brace 4 on the side close to the hub, and one end of each stay rope 6 is connected to the brace flange 41, and the other end is connected to the brace flange 41. on the shell of hub 2.

In this embodiment, a plurality of stay ropes 6 are also connected between the straight brace 5 and the brace 4 on the side close to the blade body shell 11, and one end of each stay rope 6 is connected to the brace flange 41 , and the other end is connected to the stem flange 121 of the stem portion.

As shown in Figure 6: the brace flange 41 of this embodiment is not only used to connect the adjacent poles of the brace 4, but also used to connect the straight brace 5 and the stay rope 6, and the brace flange 41 is provided with a One end of the screw sleeve 7 is obliquely fixed on the brace flange 41 through a nut 71 , and the other end is connected to the oblique stay rope 6 . Similarly, the leaf stem flange 121 is not only used to connect the adjacent segment trusses of the leaf stem, but also used to connect straight braces and cable-stayed ropes. The leaf stem flange is also provided with oblique holes, which will not be detailed here. repeat.

In this embodiment, the front stay 3 is also connected with a front stay rope 8, the other end of the front stay rope 8 is connected to the leaf stem 12, and the angle between the front stay rope 8 and the leaf stem 12 is smaller than that between the diagonal brace 4 and the leaf stem. The angle between the stems 12. Specifically, a stay cord connection seat 32 for connecting with the front stay cord 8 is provided at the end of the front stay 3; On the connection seat, that is, the leaf stem connection seat is also provided with an oblique hole passing through the screw sleeve. One end of the screw sleeve is obliquely fixed on the leaf stem connection seat by a nut, and the other end is connected to the front stay rope. The length of the front stay rope in this embodiment is set longer than the diagonal brace, so the angle between it and the leaf stem is smaller than the angle between the diagonal brace and the leaf stem, which can greatly improve the fatigue resistance of the blade body And bending resistance, if it is set shorter than the diagonal brace, the fatigue performance of the end of the leaf stem away from the diagonal brace will be enhanced, so that the wind wheel cannot be evenly stressed.

In this embodiment, when the hub 2 is connected to multiple blade bodies 1, a diagonal stay rope 9 is provided between the braces 4 of each blade body 1; On the diagonal bracing flange 41 of the support, the specific connection mode is the same as the stay rope, and will not be described in detail here. The stability of the overall rotation of the wind wheel can be improved by arranging the diagonally braced stay ropes, and fatigue caused by positive and negative forces can be prevented.

In summary, the present invention can prevent the bending of the blade body by setting the diagonal brace and the straight brace, so that it can always form an overall optimal and uniform force; and the diagonal brace is a rod structure, and the straight brace is a truss structure, which can On the basis of saving steel, it can also greatly improve the bending strength and ensure the stable operation of the wind rotor under strong winds; by setting up the interaction of diagonal braces, straight braces and diagonal stay ropes, the blade body can be supported and pulled. There will be no transitional bending and fatigue, and the wind wheel will always form a balanced state of uniform force, and there will be no stress problem beyond the load; by setting the front pull rope and combining it with the front support and straight support, it can save consumables on the basis of In addition, it can also greatly improve the overall fatigue resistance of the leaf stem. Coupled with the diagonal bracing rope, it can greatly improve the overall operation stability of the wind wheel. Whether it is subjected to strong wind or positive and negative wind, it can maintain the leaf stem. There will be no bending and fatigue at the part, and the mechanical properties are remarkable.

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims (10)

1. A supporting system of a metal wind power blade comprises a blade body and a hub connected with the blade body, wherein a front support is arranged on the hub; the novel blade is characterized in that an inclined strut is arranged between the front strut and the blade skeleton of the blade body, and a straight strut is connected between the inclined strut and the blade skeleton.

2. The support system of a metal wind power blade according to claim 1, wherein a diagonal draw rope is arranged between the diagonal brace and the blade skeleton.

3. The support system of a metal wind power blade according to claim 1, wherein a diagonal draw rope is arranged between the diagonal brace and the hub.

4. A support system for a metal wind power blade according to claim 2 or 3, wherein one end of the diagonal draw rope is connected to a blade skeleton or hub, and the other end is connected between the diagonal strut and the straight strut.

5. A support system for a metal wind power blade according to claim 2 or 3, wherein the oblique rope is fixed on a connecting seat of the blade skeleton, an oblique hole for passing through a screw sleeve is arranged on the connecting seat, one end of the screw sleeve is obliquely fixed on the connecting seat through a nut, and the other end of the screw sleeve is connected with the oblique stay rope.

6. The support system of the metal wind power blade according to claim 5, wherein the diagonal braces are formed by connecting a plurality of rod bodies through flange seats, and diagonal brace pull ropes are arranged between the diagonal braces of each blade body when the hub is connected with a plurality of blade bodies; the flange seat is provided with an inclined hole for penetrating through the threaded sleeve, one end of the threaded sleeve is obliquely fixed on the flange seat through a nut, and the other end of the threaded sleeve is connected with an inclined stay cord.

7. The support system of a metal wind power blade according to claim 1, wherein the diagonal braces are rods and the straight braces are truss structures.

8. A support system for a metal wind power blade according to claim 2 or 3, wherein the blade body is formed by splicing a plurality of sections of blades, the She Gujia is a stem part and is arranged in an inner cavity of the blade, and a blade root end of the stem part extends out to be connected with a hub; the inclined strut is connected with the leaf stem part through a leaf stem connecting seat, and the leaf stem connecting seat is arranged at the splicing position of the adjacent fan blades; the cable-stayed rope and at least one straight stay are connected to the structure extending from the leaf stem.

9. The support system of a metal wind power blade according to claim 1, wherein at least two straight struts are arranged between the diagonal struts and the blade skeleton, and the straight struts are arranged perpendicular to She Gujia.

10. The support system of the metal wind power blade according to claim 1, wherein the front support is further connected with a front stay rope, the other end of the front stay rope is connected with She Gujia, and an included angle between the front stay rope and the blade skeleton is smaller than an included angle between the diagonal support and the blade skeleton; the included angle between the inclined strut and the leaf framework is not more than 30 degrees.

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