Photovoltaic cable truss bracket

Abstract

The present invention belongs to the technical field of photovoltaic supports, and specifically relates to a photovoltaic cable truss support. This photovoltaic cable truss support comprises: a plurality of center columns arranged in rows, with end columns provided at both ends of each row; a cable truss mechanism mounted on each row of end columns and center columns; the cable truss mechanism comprises an upper chord, a lower chord, and a diagonal rod, with the diagonal rod disposed between the upper and lower chords; the upper and lower chords are flexible cables; a plurality of purlins are laid on the upper chords of every two rows of the cable truss mechanism; and the end columns are provided with diagonal braces connected to external fixings. This photovoltaic cable truss support has the advantages of saving materials, strong load-bearing capacity, and strong resistance to deformation, thereby achieving the effect of improving the stability of photovoltaic modules.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic supports, and in particular relates to a photovoltaic cable truss support. Background Art

[0002] Solar photovoltaic brackets are special brackets designed for placing, installing, and fixing solar panels in solar photovoltaic power generation systems. They are generally made of aluminum alloy, carbon steel, and stainless steel.

[0003] Solar mounting systems are made of carbon steel and stainless steel. The carbon steel is hot-dip galvanized, ensuring 30 years of rust-free outdoor use. These solar mounting systems are weld-free, drill-free, 100% adjustable, and 100% reusable.

[0004] A typical existing flexible photovoltaic support system consists of several central columns arranged in one or two rows, with end columns at either end. Each row of central and end columns is equipped with a cable mechanism. This cable mechanism includes at least one cable attached to the end and central columns, and typically also includes a diagonal cable connecting the upper end of the end column to the ground. The cables are pre-tensioned, and the photovoltaic modules are directly mounted on the cables. By adopting an optimized self-balancing prestressed cable system, the vertical stiffness of the cables is increased, significantly improving the spanning capacity of the photovoltaic support, reducing the footprint, and making it more adaptable to areas with complex terrain.

[0005] The above-mentioned existing technical solutions have the following drawbacks: 1. Although the optimized self-balancing prestressed cable system improves the vertical stiffness of the structure, the vertical stiffness of the cables is still relatively low, and they are prone to significant deformation under wind loads. 2. The cables will expand and contract under various loads. PV modules mounted directly on the cables will deform with them, causing damage to the modules. 3. The large number of columns hinders material conservation. Summary of the Invention

[0006] The purpose of the present invention is to provide a photovoltaic flexible bracket, which, through a simple structure, saves the number of columns and solves the technical problem that the cables will produce telescopic deformation under various loads, leading to damage to the photovoltaic modules. At the same time, it improves the structural bearing capacity and the ability to resist deformation, thereby achieving the purpose of increasing the structural bearing load and improving the stability of the photovoltaic modules.

[0007] In order to solve the above technical problems, the present invention provides a photovoltaic cable truss support, comprising:

[0008] A plurality of central columns are arranged in a row and end columns are provided at both ends of the central columns;

[0009] A cable truss mechanism is installed on each row of the end columns and the middle columns;

[0010] The cable truss mechanism includes an upper chord, a lower chord and an oblique rod, wherein the oblique rod is arranged between the upper chord and the lower chord;

[0011] The upper chord and the lower chord are flexible cables, and pre-tension is applied to the cables;

[0012] Furthermore, a plurality of purlins are laid on the upper chords of each two adjacent rows of the cable truss mechanisms;

[0013] Furthermore, the end column is provided with a diagonal brace connected to an external fixing point.

[0014] Furthermore, a height difference is formed between the two adjacent rows of center columns and end columns.

[0015] Furthermore, the oblique rods are connected end to end to form a plurality of W-shaped corrugated support frames.

[0016] Furthermore, the plurality of W-shaped corrugated support frames are disconnected at mid-span.

[0017] Furthermore, secondary transverse support rods are provided between adjacent diagonal rods.

[0018] Furthermore, buffer blocks are provided at both ends of the secondary transverse support rod, and elastic adhesive layers are provided on both sides of the buffer blocks.

[0019] Furthermore, a plurality of upper damping mechanisms are provided at the lower end of the upper chord, and the upper damping mechanisms include an upper hanging rope provided on the upper chord and an upper damping sphere provided at the lower end of the hanging rope;

[0020] The lower end of the lower chord is provided with a plurality of lower damping mechanisms, and the lower damping mechanisms include a lower hanging rope provided on the lower chord and a lower damping ball provided at the lower end of the hanging rope.

[0021] The beneficial effects of the present invention are:

[0022] 1. By laying purlins on the upper chords, more photovoltaic modules can be laid along the purlins. The same number of photovoltaic modules requires fewer piles, thus saving materials.

[0023] 2. Since purlins are laid on the upper chord and photovoltaic modules are laid on the purlins, the photovoltaic modules are not directly connected to the upper chord, which is equivalent to adding a buffer structure between the upper chord and the photovoltaic modules. The photovoltaic modules are less likely to be damaged by the expansion and contraction of the upper chord.

[0024] 3. Since the cable truss structure adopted in this patent solution can provide vertical stiffness far greater than that of general single-layer cables according to common sense of engineering mechanics, and because purlins are laid on the cable truss structure, the spacing between the cable trusses is larger. When subjected to vertical loads or wind torsion, the deformation and torsion angles will be greatly reduced.

[0025] 4. Since the patented solution applies pre-tension to the cables, the structure will not have stability problems, thus avoiding the waste of materials in order to solve the stability problem.

[0026] 5. The transverse support rod can play a transverse supporting role and form a stable triangular structure with the diagonal rod, thereby further increasing the stability of the structure.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a structural schematic diagram of the photovoltaic cable truss support of the present invention;

[0030] Figure 2 It is a partial structural schematic diagram of the photovoltaic cable truss support of the present invention;

[0031] Figure 3 It is a schematic diagram of the force of the purlin of the present invention.

[0032] In the picture:

[0033] 1. Center column;

[0034] 2. End column;

[0035] 3. Cable truss mechanism; 31. Upper chord; 32. Lower chord; 33. Diagonal rod;

[0036] 4. Purlins;

[0037] 5. Oblique pull;

[0038] 6. Secondary lateral support rod; 61. Buffer block; 62. Elastic adhesive layer;

[0039] 7. Upper damping mechanism; 71. Upper hanging rope; 72. Upper damping sphere;

[0040] 8. Lower damping mechanism; 81. Lower hanging rope; 82. Lower damping sphere. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] Example:

[0043] like Figures 1 to 3 As shown, a photovoltaic cable truss support includes: a number of center columns 1, arranged in rows, taking two rows as an example, and end columns 2 are provided at both ends of the center columns 1. The end columns 2 and the center columns 1 mainly play a supporting role, holding up the upper structure and photovoltaic modules. Providing an appropriate number of center columns 1 can reduce the span. In this embodiment, the center columns 1 and the end columns 2 arranged in two rows form a height difference between the two rows, so that the laid photovoltaic modules can have an inclined angle, thereby having a better sun-facing effect. A diagonal pull 5 is provided between the upper end of the end column 2 and the ground to balance the horizontal force on the end column 2.

[0044] like Figure 1 As shown, a cable truss mechanism 3 is installed on each row of end columns 2 and the middle column 1; the cable truss mechanism 3 includes an upper chord 31, a lower chord 32 and a diagonal rod 33, and the diagonal rod 33 is arranged between the upper chord 31 and the lower chord 32. The diagonal rod 33 is arranged above the middle column 1. Among them, the upper chord 31 and the lower chord 32 are flexible cables. In this embodiment, the upper chord 31 and the lower chord 32 can be made of but not limited to steel strands, and a very high pre-tension is applied to the steel strands. When this cable truss mechanism 3 is subjected to an in-plane load, according to mechanical theory, analogous to a beam subjected to a vertical load, tensile and compressive stresses will be generated on the upper and lower surfaces. The cable truss mechanism 3 of this patent solution will also generate tensile and compressive stresses in the upper chord 31 and the lower chord 32 respectively. Compressive stress may cause stability problems, but as long as the pressure caused by the external load in the chord is not greater than the pre-tension in the steel strand, there is no pressure in the chord. Therefore, the cable truss mechanism 3 of this patent solution does not need to be verified for lateral stability, and no additional structure is required to provide out-of-plane stability. It only needs two chords and corresponding diagonal rods 33, while conventional steel structure trusses require at least three chords to form a stable structure. The cable truss used in this patent solution greatly simplifies the structure. Furthermore, because the diagonal rods 33 of the cable truss near the mid-span are subjected to lower stress, the diagonal rods 33 are disconnected at the mid-span, saving material and simplifying the structure without affecting performance indicators.

[0045] like Figure 1 and Figure 3 As shown in Figure 3 , in this embodiment, the diagonal bars 33 are connected end to end to form a number of W-shaped waveform support frames.

[0046] Meanwhile, a number of purlins 4 are laid on the upper chord cable 31, such that the photovoltaic modules are not directly connected to the upper chord cable 31, which is equivalent to adding a buffer structure between the upper chord cable and the photovoltaic modules, thereby making it less likely for the photovoltaic modules to be damaged due to the telescopic deformation of the upper chord cable.

[0047] Since purlins 4 are laid on the upper chord cable 31, the spacing between the two stay cables is no longer restricted by the size of the photovoltaic modules, and the spacing can be increased. More photovoltaic modules can be laid along the purlins 4, and the number of piles used for the same number of photovoltaic modules is less, thus saving the number of middle columns 1 and end columns 2 and being more material-saving.

[0048] Generally speaking, in order to face the sun, the photovoltaic modules are arranged with an inclination. When such an inclined flat structure faces the wind, it is equivalent to a typical flat airfoil. In the field of aerodynamics, the inclination angle is called the angle of attack. The wind load received by this airfoil is not only the force passing through the centroid of the cross-section, but also the torque around the centroid, that is, the wind torsional moment. A number of purlins 4 are laid on the upper chord cable 31, making the spacing between the cable trusses larger, and the vertical stiffness provided by the cable truss mechanism 3 used in this patent solution is much greater than that of a conventional single stay cable. Therefore, under the condition of receiving vertical loads or wind torsion, the deformation and torsional angle are much smaller. The proof is as follows: make the following comparison. Assume that the vertical stiffness of the conventional single stay cable in the prior art and the cable truss mechanism 3 in this patent solution are both linear. Let the vertical stiffness of the single stay cable in the prior art be k, the vertical load be f, the wind torsional moment be m, the spacing between the two stay cables be d, and the chord length of the wind-receiving area formed by the photovoltaic modules be l (the chord length is a technical term in aerodynamics, which in this patent refers to the width of the component wind-receiving area along the air flow direction). Assume that the span of this patent solution is the same as that of the prior art solution, and the number of modules laid per span is a times that of the prior art solution, and a>1. Therefore, the chord length of the wind-receiving area formed by the modules is a*l, and the vertical load is a*f. According to aerodynamic knowledge, when the chord length becomes a times, the wind torsional moment becomes a 2 , 2 , 2 times, that is, a 2 *m. Let the vertical stiffness provided by the single-row cable truss mechanism 3 in this patent solution be b*k. Since the stiffness of the cable truss mechanism 3 is much greater than that of the horizontal stay cable, b>>a>1. The distance between the two stay cables in this patent solution is a*d. According to mechanical theory, the vertical deformation D1 of the existing solution is f / (2*k), and the vertical deformation D2 of this patent solution is a*f / (2*b*k), D2=(a / b)*D1. Because b>>a, so D2<<D1. At small angles, the torsional angle α of the prior art solution is m / (d 2 *k), and the torsional angle β of this patent solution is a 2*m / ((a*d) 2 *b*k). Comparison reveals that β=α / b. Based on the above derivation, compared to the prior art, this patent reduces the deformation under vertical load by b / a times, and reduces the rotation angle under wind torsion by b times, b>>a>1. This means that this patent solution can effectively reduce the deformation of the bracket under vertical load and the torsion angle under wind torsion. The above derivation assumes that the vertical stiffness of the single cable in the prior art and the cable truss mechanism 3 of this patent solution are both linear, and the torsion angle is a linear solution. In reality, both have nonlinear effects, but this does not affect the qualitative analysis.

[0049] like Figure 1 and Figure 2 As shown, secondary transverse support rods 6 are disposed between adjacent diagonal rods 33, forming a stable triangular structure between the secondary transverse support rods and the adjacent diagonal rods 33. Furthermore, to reduce damage to the secondary transverse support rods 6 due to deformation of the diagonal rods 33, buffer blocks 61 are disposed at both ends of the secondary transverse support rods 6. Elastic adhesive layers 62 are disposed on both sides of the buffer blocks 61. When the diagonal rods 33 deform, the buffer blocks 61 maintain the stable triangular structure formed between the secondary transverse support rods 6 and the diagonal rods 33 through their own deformation.

[0050] like Figure 1 and Figure 2 As shown, the lower end of the upper chord 31 is provided with a plurality of upper damping mechanisms 7, comprising an upper hanging rope 71 and an upper damping sphere 72 at the lower end of the hanging rope. The lower end of the lower chord 32 is provided with a plurality of lower damping mechanisms 8, comprising a lower hanging rope 81 and a lower damping sphere 82 at the lower end of the hanging rope. Due to the upper damping spheres 72 on the upper hanging rope 71, when the upper chord 31 oscillates or swings due to external forces, the upper damping spheres 72 swing accordingly. Because the upper damping spheres 72 and the lower damping spheres 82 swing in directions opposite to the direction of the chord swing, the upper damping spheres 72 and the lower damping spheres 82 generate forces opposite to the swinging, thereby reducing the swing amplitude of the upper and lower chords 31 and 32, thereby offsetting the effect of wind on the chord swing and reducing the sway of the upper and lower chords 31 and 32.

[0051] In summary: by laying purlins 4 on the upper chord 31, more photovoltaic modules can be laid along the purlins 4, and the same number of photovoltaic modules requires fewer piles, thus saving materials. Since the purlins 4 are laid on the upper chord 31 and the photovoltaic modules are laid on the purlins 4, the photovoltaic modules are not directly connected to the upper chord 31, which is equivalent to adding a buffer structure between the upper chord 31 and the photovoltaic modules. The photovoltaic modules are less likely to be damaged by the expansion and contraction deformation of the upper chord 31. Since pre-tension is applied to the upper chord 31 and the lower chord 32, the structure has no stability risk and there is no need to waste materials for stability issues. Since the cable truss mechanism 3 used in this patent solution, according to common sense of engineering mechanics, can provide a vertical stiffness far greater than that of the horizontal cable, and because the purlins 4 are laid on the cable truss mechanism 3, the spacing between the cable truss mechanisms 3 is larger. When subjected to vertical loads or wind torque, the deformation and torsion angles will be greatly reduced. The secondary lateral support rod 6 can play a lateral supporting role and form a stable triangular structure with the oblique rod 33, thereby further increasing the stability of the oblique rod 33.

[0052] The various devices selected in this application are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0053] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. There may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interface, indirect coupling or communication connection of devices or units, which may be electrical, mechanical or other forms.

[0056] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0057] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0058] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the composition and steps of each example according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0059] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A photovoltaic cable truss support, characterized in that: include: A plurality of center columns (1) are arranged in a row and end columns (2) are provided at both ends of the center columns (1); A cable truss mechanism (3) is mounted on each row of the end columns (2) and the middle columns (1); A plurality of purlins (4) are laid on the upper chords (31) of each of the two adjacent rows of the cable truss mechanisms (3); The cable truss mechanism (3) comprises an upper chord (31), a lower chord (32) and an oblique rod (33), wherein the oblique rod (33) is arranged between the upper chord (31) and the lower chord (32); The upper chord (31) and the lower chord (32) are flexible cables, and pre-tension is applied to the cables; The oblique rods (33) are connected end to end to form a plurality of W-shaped corrugated support frames; The plurality of W-shaped corrugated support frames are disconnected in the middle of the span; A secondary transverse support rod (6) is provided between adjacent inclined rods (33); Buffer blocks (61) are provided at both ends of the secondary transverse support rod (6), and elastic adhesive layers (62) are provided on both sides of the buffer block (61).

2. A photovoltaic cable truss support according to claim 1, characterized in that: The end column (2) is provided with a diagonal stay (5) connected to an external fixing point.

3. The photovoltaic flexible bracket according to claim 1, characterized in that: The end columns (2) and the middle columns (1) arranged in rows form a height difference between two adjacent rows.

4. A photovoltaic cable truss support according to claim 1, characterized in that: A plurality of upper damping mechanisms (7) are provided at the lower end of the upper chord (31), and the upper damping mechanisms (7) include an upper hanging rope (71) provided on the upper chord (31) and an upper damping sphere (72) provided at the lower end of the hanging rope; The lower end of the lower chord (32) is provided with a plurality of lower damping mechanisms (8), and the lower damping mechanisms (8) include a lower hanging rope (81) provided on the lower chord (32) and a lower damping ball (82) provided at the lower end of the hanging rope.

Images