Supporting frame of multi-impeller wind power system

Abstract

The utility model discloses a supporting frame of a multi-impeller wind power system. The device comprises a support, an arch truss and a horizontal truss. The supporting frame is used for supporting the multiple wind power units, and each wind power unit comprises an impeller and a cabin. The top end of each support is connected with the cabin. The arch truss is arranged between the two supports, the horizontal truss is arranged between the two supports, the two ends of the arch truss are connected with the bottoms of the two adjacent supports respectively, and the two ends of the horizontal truss are connected with the middles of the two adjacent supports respectively. The middle of the arch truss is connected with the middle of the horizontal truss to form an intersection connection position, and the cabin is connected with the intersection connection position. The supporting frame can effectively cope with thrust load and gravity load generated by the wind power unit, and meanwhile, a plurality of supports can be connected together to achieve the integrity of the supporting frame. Materials are effectively distributed, the connection rigidity of a local structure is guaranteed, and loaded deformation is controlled; the material consumption is reduced, and the total cost is controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind power generation, and in particular relates to a support frame of a multi-impeller wind power system. 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] Throughout the development of wind power, cost has become a bottleneck for the entire industry, a global issue. Larger wind turbines (i.e., increased turbine capacity) have proven to be an effective way to address this cost issue. However, as capacity continues to increase, conventional wind turbine designs face increasingly severe challenges. Beyond the need for extra-long blades, the dramatic increase in loads necessitates the use of oversized load-bearing components, such as extra-large pitch slewing bearings, main bearings, and gearboxes weighing hundreds of tons. This presents numerous challenges in manufacturing, transportation, and installation.

[0004] A multi-blade wind turbine system is a new type of wind power equipment that converts wind energy into electrical energy by installing multiple wind turbine units of smaller rated capacity on a single support frame. Compared to conventional single-blade wind turbines, multi-blade wind turbine systems avoid the use of oversized components such as extra-long and extra-heavy blades. This reduces the complexity of manufacturing, transportation, and installation while avoiding the occurrence of excessive loads, providing a new technical path for the large-scale development of wind turbines.

[0005] The support frame is a newly introduced component. Its role in a multi-blade wind turbine system is similar to that of a conventional single-blade wind turbine tower—it enables the wind turbine unit to be supported and fixed at a higher altitude from the ground, transferring the load generated by the wind turbine unit during operation to the foundation. Unlike the tower, the support frame needs to support multiple wind turbine units at the same time, constructing a huge windward surface composed of the rotors of multiple wind turbine units, so the structure has a large span. This feature makes it impossible for the support frame to directly adopt a structure similar to that of a conventional wind turbine tower. Using a continuous spatial steel structure for all wind turbines would significantly increase the amount of steel used and reduce the economic efficiency of the support frame.

[0006] In addition to gravity loads, each wind turbine generates significant aerodynamic thrust and additional bending moment loads acting on the support frame after operation. The main issues that need to be addressed in the support frame design are: 1) ensuring the support stiffness of the structure directly connected to the wind turbine, so that the load from the wind turbine does not cause excessive structural deformation. In particular, the connection to wind turbines with higher hub heights must meet the requirements of general high-rise structure specifications; 2) maintaining the overall structural stiffness and stability of the long-span structure to withstand the multiple loads caused by the simultaneous operation of multiple wind turbines; 3) reducing material usage and controlling the cost of the support frame; and 4) minimizing the support frame's interference with airflow velocity, which may even cause large-scale obstruction and the formation of a tower shadow effect. Summary of the Invention

[0007] The first object of the present invention is to provide a support frame for a multi-impeller wind power system to solve at least one technical problem mentioned in the background technology.

[0008] To achieve the above-mentioned object, a first aspect provides a support frame for a multi-blade wind power system, which includes a bracket, an arch truss and a horizontal truss;

[0009] The support frame is used to support multiple wind turbine units, each of which includes an impeller and a nacelle; the top of each bracket is connected to the nacelle to support one wind turbine unit;

[0010] The arch truss is arranged between the two supports, the horizontal truss is arranged between the two supports, the two ends of the arch truss are respectively connected to the bottom of the two adjacent supports, and the two ends of the horizontal truss are respectively connected to the middle of the two adjacent supports;

[0011] The middle portion of the arch truss is connected to the middle portion of the horizontal truss to form an intersection and connection position; the cabin is arranged at the intersection and connection position.

[0012] In a further technical solution, the distance between the two brackets is at least greater than 1.05 times the diameter of the impeller.

[0013] The height of the bracket above the horizontal truss is greater than 0.91 times the diameter of the impeller.

[0014] The cabin is arranged at the center of the horizontal truss between two adjacent supports, and the impeller rotation axis is perpendicular to the direction in which the horizontal truss extends toward the support.

[0015] The horizontal span of the arch truss along the direction of the impeller rotation axis is a first horizontal span, and the first horizontal span changes uniformly from the end of the arch truss to the intersection and connection position.

[0016] In a further technical solution, the maximum value of the first horizontal span is located at the position where the bottom of the bracket is connected to the end of the arch truss; the minimum value of the first horizontal span is located at the intersection and connection position.

[0017] The horizontal span of the horizontal truss along the direction of the impeller rotation axis is a second horizontal span, and the second horizontal span changes uniformly from the end of the horizontal truss to the intersection and connection position.

[0018] In a further technical solution, the maximum value of the second horizontal span is located at the position where the bracket is connected to the end of the horizontal truss; the minimum value of the second horizontal span is located at the intersection and connection position.

[0019] The portion of the arch truss located between the intersection and the end of the arch truss is connected to the horizontal truss and the bracket through a web member.

[0020] In a second aspect, a multi-impeller wind power system is provided, wherein the multi-impeller wind power system includes a support frame of the multi-impeller wind power system.

[0021] The beneficial effects of this utility model are as follows: with the brackets as the primary load-bearing structure, wind turbine units are arranged between the brackets, and horizontal trusses and arch trusses connect adjacent brackets. This effectively counteracts the thrust and gravity loads generated by the wind turbine units, while also connecting multiple brackets together to maintain the integrity of the support frame. The support frame effectively distributes material, ensuring the connection stiffness of the local structure and controlling load deformation; it also reduces material usage, achieving the effect of controlling overall costs; and it also reduces the disturbance and obstruction of the airflow near the impeller by the support frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a general schematic diagram of a support frame according to an embodiment of the present utility model;

[0023] Figure 2 A side view of a support frame of an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of connecting adjacent brackets of a support frame according to an embodiment of the present utility model;

[0025] Figure 4 This is a schematic diagram of the intersection and connection between the arch truss and the horizontal truss of a support frame according to an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of the bracket height requirements of a support frame according to an embodiment of the present utility model;

[0027] Figure 6 This is a bird's-eye view of an arch truss of a support frame according to an embodiment of the present invention;

[0028] Figure 7 This is an overhead view of a horizontal truss of a support frame according to an embodiment of the present invention.

[0029] Description of Figure Numbers:

[0030] 1. Bracket, 1.1. Bracket height above the horizontal truss, 1.2. Bracket height below the horizontal truss, 2. Arch truss, 2.1. First horizontal span, 3. Horizontal truss, 3.1. Second horizontal span, 4. Wind turbine unit, 4.1. Nacelle, 4.2. Impeller diameter, 5. Intersection connection location, 6. Web member.

[0031] It is important to note that the aforementioned figures 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 hinder understanding of the present invention by those skilled in the relevant art, and actual embodiments may include additional modules or components. DETAILED DESCRIPTION

[0032] 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.

[0033] like Figure 1 As shown, a support frame of a multi-blade wind power system mainly comprises a bracket (1), an arch truss (2) and a horizontal truss (3). The support frame supports multiple wind power units (4) in the air at a certain height above the ground, and transmits the loads (such as thrust and bending moment loads) generated by the wind power units (4) during operation from top to bottom to the foundation. The wind power unit (4) includes a blade and a nacelle (4.1).

[0034] like Figure 2 As shown, the top end of each bracket (1) is connected to the cabin (4.1) to support a wind power unit (4). Figure 3 As shown, the two supports (1) are connected via a horizontal truss (3) and an arch truss (2). The two ends of the arch truss (2) are respectively connected to the bottoms of the two adjacent supports (1), and the two ends of the horizontal truss (3) are respectively connected to the middles of the two adjacent supports (1);

[0035] like Figure 3 and Figure 4 As shown, the middle part of the arch truss (2) intersects and connects with the middle part of the horizontal truss (3), forming an intersection connection position (5). The wind turbine unit (4) is set at the intersection connection position (5), and it can be considered that the cabin (4.1) of the wind turbine unit (4) is connected to the horizontal truss (3). For a multi-blade wind turbine system, the number of its blades should reach three or more. According to the previous description "the top of each bracket (1) is connected to the cabin (4.1) to support a wind turbine unit (4)", and "the wind turbine unit (4) is set at the intersection connection position (5)", it can be concluded that the number of brackets (1) in the support frame is at least two, and the number of horizontal trusses (3) and arch trusses (2) is at least one.

[0036] The advantages and benefits of this technical solution adopted by the utility model are mainly reflected in the following aspects:

[0037] 1) The wind power unit (4) is arranged between the top of the support (1) and the support (1), and the space is reasonably utilized to minimize the span of the entire support frame under the condition of a given number of wind power units (4);

[0038] 2) The supports (1) are connected to the arch trusses (2) via the horizontal trusses (3), effectively bearing the thrust load and gravity load generated by the wind power unit (4);

[0039] 3) The arrangement of the supports (1) and the connection structure between the supports (1) (horizontal trusses (3) and arch trusses (2)) not only meet the integrity required by the support frame, but also avoid the cost increase caused by the continuous use of steel structure connections over a large area;

[0040] 4) The influence of the support (1), the horizontal truss (3) and the arch truss (2) on the airflow near the wind power unit (4) is reduced.

[0041] The distance between the two supports (1) should be set taking into account at least the following factors: 1) the size of the impeller diameter (4.2); 2) the load generated by the impeller during operation, which causes structural deformation on the support frame, resulting in a further reduction in the distance between the blade tips of two adjacent impellers; 3) the simultaneous operation of adjacent wind turbine units (4) can have a positive impact on increasing power generation (as proven by a large number of simulation and prototype test results).

[0042] Therefore, under ideal conditions, the distance between the two brackets (1) is at least the sum of the impeller diameter (4.2) and the safety margin. However, if the value of the safety margin is too large, although it ensures that there will be no mechanical interference between the blades and between the blades and the brackets (1), it will obviously lead to an increase in the volume of the support frame. In addition, if the distance between adjacent impeller diameters (4.2) is too large, the positive effects of simultaneous operation (such as the airflow acceleration effect) will be weakened. Taking all factors into consideration, the distance between two adjacent brackets (1) should be consistent with the distance between the hub centers of adjacent wind turbine units (4), and should not be less than 1.05 times the impeller diameter (4.2).

[0043] like Figure 5 As shown, mechanical interference between adjacent impellers may also occur between the impeller at the top of the bracket (1) and the impeller between the bracket (1). Therefore, the height (1.1) of the bracket above the horizontal truss is the same as the distance between the brackets (1) and needs to meet the design requirements. Based on the description of the distance between the two brackets (1) and the distance between the hub centers of adjacent wind turbine units (4) in the above content, it can be concluded through geometric relationships that the height (1.1) of the bracket above the horizontal truss should be at least greater than 0.91 times the impeller diameter (4.2).

[0044] The cabin (4.1) is arranged in the middle of the horizontal truss (3) between two adjacent brackets (1), and the impeller rotation axis and the horizontal truss (3) are in the direction of extension toward the brackets (1) at both ends (i.e. Figure 1 The span direction, or left-right direction) of the horizontal trusses (3) shown is vertical.

[0045] The horizontal span of the arch truss (2) along the impeller rotation axis (i.e., the front-to-back direction relative to the direction of the impeller) is defined as the first horizontal span (2.1). Figure 6 As shown, the first horizontal span (2.1) changes uniformly from the end of the arch truss (2) to the intersection and connection position (5). The maximum value of the first horizontal span (2.1) is located at the position where the bottom of the bracket (1) is connected to the end of the arch truss (2), and the minimum value is located at the intersection and connection position (5). In other words, from the bottom of the bracket (1) to the horizontal truss (3), as the height from the ground increases, the first horizontal span (2.1) of the arch truss (2) gradually decreases. In this embodiment, the arch truss (2) can be considered to adopt a horizontal truss (3) structure, that is, the chord is geometrically arched as a whole, and the front and rear chords are connected by a web. Therefore, in fact, the first horizontal span (2.1) also refers to the horizontal distance between the front and rear chords in the arch truss (2). In other embodiments, the arch truss (2) can adopt a spatial truss structure according to actual engineering requirements.

[0046] The horizontal span of the horizontal truss (3) along the impeller rotation axis (i.e., the front-to-back direction relative to the direction of the impeller) is the second horizontal span (3.1), as shown in FIG. Figure 7 As shown, the second horizontal span (3.1) changes evenly from the end of the horizontal truss (3) to the intersection connection position (5). The maximum value of the second horizontal span (3.1) is located at the position where the bracket (1) is connected to the end of the horizontal truss (3), and the minimum value of the second horizontal span (3.1) is located at the intersection connection position (5). In other words, when looking down at the horizontal truss (3), the overall structure is "wide on both sides and narrow in the middle". This change is to adapt to the characteristic that the front-to-back span of the bracket (1) is larger than the front-to-back length of the cabin (4.1). Overall, the first horizontal span (2.1) and the second horizontal span (3.1) have similar change trends. In this embodiment, the horizontal truss (3) adopts a spatial truss structure, on the one hand to better connect the cabin (4.1); on the other hand, the horizontal truss (3) connects two adjacent brackets (1), which plays an important role in the integrity of the support frame, such as the overall left-right stiffness.

[0047] In this embodiment, the above content has already defined the height (1.1) of the bracket above the horizontal truss. Figure 5 As shown, in fact, the height (1.2) of the bracket below the horizontal truss will also take into account multiple factors in actual engineering. For example, the wind turbine unit (4) located in the middle of the horizontal truss (3) (that is, the intersection and connection position (5)) has corresponding requirements for the height of the blade tip from the ground, such as at least 15 meters from the ground. Therefore, the height (1.2) of the bracket below the horizontal truss must be at least greater than the length of the blade. In order to better increase the structural rigidity, the part of the arch truss (2) located between the intersection and connection position (5) and the end of the arch truss (2) is connected to the horizontal truss (3) and the bracket (1) through the web (6).

[0048] In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0049] 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.

[0050] 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 support frame for a multi-impeller wind power system, characterized in that: It includes a bracket (1), an arch truss (2) and a horizontal truss (3); The support frame is used to support a plurality of wind power units (4), wherein the wind power units (4) include an impeller and a nacelle (4.1); the top end of each bracket (1) is connected to the nacelle (4.1) to support one wind power unit (4); The arch truss (2) is arranged between the two supports (1), and the horizontal truss (3) is arranged between the two supports (1). The two ends of the arch truss (2) are respectively connected to the bottoms of the two adjacent supports (1), and the two ends of the horizontal truss (3) are respectively connected to the middle parts of the two adjacent supports (1). The middle portion of the arch truss (2) is connected to the middle portion of the horizontal truss (3), forming an intersection connection position (5); the cabin (4.1) is arranged at the intersection connection position (5).

2. The support frame of a multi-impeller wind power system according to claim 1, characterized in that: The distance between the two supports (1) is at least greater than 1.05 times the diameter (4.2) of the impeller.

3. The support frame of a multi-impeller wind power system according to claim 1, characterized in that: The height (1.1) of the bracket above the horizontal truss is greater than 0.91 times the diameter (4.2) of the impeller.

4. The support frame of a multi-impeller wind power system according to claim 1, characterized in that: The cabin (4.1) is arranged at the center of the horizontal truss (3) between two adjacent supports (1), and the impeller rotation axis is perpendicular to the direction in which the horizontal truss (3) extends toward the support (1).

5. The support frame of a multi-impeller wind power system according to claim 1, characterized in that: The horizontal span of the arch truss (2) along the direction of the impeller rotation axis is a first horizontal span (2.1), and the first horizontal span (2.1) changes evenly from the end of the arch truss (2) to the intersection connection position (5).

6. The support frame of a multi-impeller wind power system according to claim 5, characterized in that: The maximum value of the first horizontal span (2.1) is located at the position where the bottom of the bracket (1) is connected to the end of the arch truss (2); the minimum value of the first horizontal span (2.1) is located at the intersection connection position (5).

7. The support frame of a multi-impeller wind power system according to claim 1, characterized in that: The horizontal span of the horizontal truss (3) along the direction of the impeller rotation axis is a second horizontal span (3.1), and the second horizontal span (3.1) changes evenly from the end of the horizontal truss (3) to the intersection connection position (5).

8. The support frame of a multi-impeller wind power system according to claim 7, characterized in that: The maximum value of the second horizontal span (3.1) is located at the position where the bracket (1) is connected to the end of the horizontal truss (3); the minimum value of the second horizontal span (3.1) is located at the intersection connection position (5).

9. The support frame of a multi-impeller wind power system according to claim 8, characterized in that: The portion of the arch truss (2) located between the intersection connection position (5) and the end of the arch truss (2) is connected to the horizontal truss (3) and the bracket (1) via a web member (6).

10. A multi-impeller wind power system, characterized in that: A support frame comprising a multi-impederment wind power system as claimed in any one of claims 1 to 9.

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