Parabolic heat collector supporting structure combining supporting wings and torsion rings

Abstract

The invention belongs to the technical field of photo-thermal power generation supporting structures, and particularly relates to a parabolic collector supporting structure combining supporting wings and torsion rings, which comprises a plurality of groups of supporting units connected side by side, and each group of supporting units comprises a supporting wing and a torsion ring which are fixedly connected; each supporting wing comprises a plurality of upper chords, web members and lower chords; each torsion ring comprises a steel ring, a flexible pull rod and a steel pipe; the upper chord member and the lower chord member are connected through a plurality of web members to form a parabolic opening structure; the steel pipe penetrates through the circle center of the steel ring of each supporting unit and is fixedly connected with the steel ring through a flexible pull rod. Connecting nodes are respectively arranged between the steel ring and the upper chord member and between the steel ring and the lower chord member; the supporting wings in each supporting unit are connected through a plurality of purlines, and the torsion rings in the adjacent supporting units are connected through inclined rods. By means of the design of the supporting wings and the torsion rings, the stability of the structure is guaranteed, the utilization rate of materials is increased through clear division of labor, the usage amount of steel is effectively reduced, and the production cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of photothermal power generation support structures, and in particular relates to a parabolic collector support structure with a combined support wing and a torsion ring. Background Art

[0002] The sun is the most abundant renewable energy source, and its radiation can be used to generate electricity directly through photovoltaic technology or through concentrated solar thermal power generation systems. After the oil crisis in the 1980s, with the emergence of the first parabolic trough solar power stations, concentrated solar power generation technology began to attract attention. Compared with photovoltaic technology, solar thermal power generation technology has the advantages of high thermal efficiency, heat storage capacity, and a wide range of applications. Therefore, in some specific scenarios, solar thermal power generation technology will definitely become the best choice for solar power generation.

[0003] However, compared with photovoltaic power generation, solar thermal power generation has more technical difficulties. First, under the action of its own weight, wind, snow and other loads, the collector makes circular motion around the driving axis, the frame will deform, causing the parabola of the reflector to change, affecting the light interception rate and reducing the optical efficiency. Second, how to reduce the manufacturing and use costs of the collector while meeting the structural strength requirements. Compared with photovoltaic power generation, the financial investment of solar thermal power generation is much higher. The key to determining the cost of the collector lies in the design of the supporting structure. The supporting structure is closely related to the material, assembly and maintenance costs of the collector. How to design the supporting structure of the collector and reduce the cost is a research hotspot in the current field of solar thermal power generation.

[0004] At present, in order to improve the light interception rate and reduce costs, the supporting structure is usually optimized to achieve higher material utilization and better stability. After more than 30 years of development, traditional parabolic collectors have shown a variety of forms. According to a large number of existing studies, they can be divided into three categories according to the different supporting structures, namely torque tubes, torque boxes, and space frames. According to engineering experience, the torque tube and torque box form has the advantages of fewer components and low assembly cost, but the high steel consumption per unit area leads to high cost; compared with the torque tube and torque box form, the space tube truss has the advantages of no need for fixtures for assembly, low steel consumption per unit area, which reduces material cost by 10%, high torsional stiffness, significantly improved optical performance, and high degree of standardization, but it has many components, high assembly precision requirements, and high assembly cost. In order to further improve the light interception rate and reduce costs, it is now necessary to combine the existing collector support structure form to design a parabolic collector structure with high light interception rate, low assembly cost, and good mechanical properties. Summary of the invention

[0005] The purpose of the present invention is to provide a parabolic collector support structure with combined support wings and torsion rings. Through the support wings and torsion rings, the collector structure has a clear division of labor in bearing mirror loads and transmitting torque, which not only ensures the stability of the structure, but also effectively reduces the use of steel and reduces production and maintenance costs.

[0006] To achieve the above-mentioned object, the present invention provides a parabolic collector support structure combining support wings and torsion rings, comprising a plurality of groups of support units connected side by side, each group of the support units comprising a fixedly connected support wing and a torsion ring; the support wing comprises a plurality of upper chord rods, a plurality of belly rods and a plurality of lower chord rods, and the torsion ring comprises a steel ring, a flexible tie rod and a steel pipe;

[0007] The upper chord and the lower chord are connected by the web to form a parabolic opening structure; the steel pipe passes through the center of the steel ring of each support unit and is fixedly connected to the steel ring by the flexible pull rod;

[0008] The steel ring is provided with connection nodes respectively between the upper chord and the lower chord; the support wings in each group of the support units are connected by a plurality of purlins, and the torsion rings in adjacent support units are connected by diagonal rods.

[0009] Furthermore, a first connection node is arranged between the top of the steel ring and the upper chord rod, and a second connection node and a third connection node are arranged between the top of the steel ring and the lower chord rod.

[0010] Furthermore, the diameter of the steel ring is greater than the vertical distance between the upper chord and the lower chord, so that the second connection node and the third connection node are symmetrically distributed on both sides of the upper semicircle of the steel ring, and the connection nodes are rivet connections.

[0011] Furthermore, the opening width of the parabolic opening structure of the support wing is larger than the diameter of the torsion ring, and is preferably 3-4 times the diameter of the torsion ring.

[0012] Furthermore, the upper chords form an upper parabola structure, the lower chords form a lower parabola structure, the webs are staggered and fixed between the upper chords and the lower chords, and the webs are connected to the upper chords and the lower chords by welding.

[0013] Furthermore, 12 flexible pull rods are fixed between each of the steel rings and the steel pipe, and each of the flexible pull rods is distributed at equal intervals.

[0014] Furthermore, the connection nodes of the oblique rods on the steel rings coincide with the connection nodes of the flexible pull rods, and each of the oblique rods is staggered between two adjacent steel rings.

[0015] Furthermore, 12 oblique rods are connected between two adjacent steel rings, and one end of two adjacent oblique rods shares a connection node.

[0016] The present invention also provides a parabolic collector, comprising the parabolic collector support structure described in any one of the above items, a heat collecting unit arranged on the parabolic collector support structure, and a driving unit for driving the parabolic collector support structure to rotate.

[0017] In general, the above technical solution conceived by the present invention has the following technical advantages compared with the prior art:

[0018] 1. The parabolic collector support structure of the combined support wing and torsion ring provided by the present invention has a clear division of labor in the collector structure in terms of bearing mirror load and transmitting torque through the combined design of the support wing and torsion ring; the steel pipe is connected to the steel ring through a flexible tie rod, which not only balances the center of gravity and the rotating shaft, reduces the driving torque of the driver, but also introduces the principle of tuned mass damper. Under extreme working conditions, when the collector is vibrated by external force, the inertia of the steel pipe can absorb the vibration energy, reduce the possibility of tilting and shaking, and reduce the vibration amplitude, thereby improving the stability of the collector; the utilization rate of materials is also improved through a clear division of labor, effectively reducing the use of steel, and reducing production and maintenance costs.

[0019] 2. Through the combination of the support wing and the torsion ring, the collector structure has a clear division of labor in bearing the mirror load and transmitting torque, which enables the opening width of the support wing to be further increased, thereby achieving a larger concentration ratio and significantly improving the optical efficiency.

[0020] 3. The support wing of the present invention adopts a plane tube truss structure, and the rods are square tubes, which are connected by intersecting nodes to improve the cross-sectional utilization efficiency. The design of the torsion ring adopts lightweight rods, which are easy to assemble and transport, further reducing the cost. In addition, all welding work is completed in the factory, reducing the amount of on-site welding, improving the quality of node connection, and ensuring the reliability of the node. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the parabolic collector support structure of the combined support wing and torsion ring of the present invention;

[0022] Figure 2 A side view of a parabolic collector support structure of the present invention with a combined support wing and a torsion ring;

[0023] Figure 3 A bottom view of the parabolic collector support structure of the present invention with combined support wings and torsion rings;

[0024] Figure 4It is a partial enlarged view of the connection part of the parabolic collector support structure of the combined support wing and the torsion ring;

[0025] Figure 5 A partial assembly diagram of a parabolic collector with combined support wings and torsion rings.

[0026] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0027] 1- purlin; 2- diagonal rod; 3- steel ring; 4- steel pipe; 5- flexible tie rod; 6- upper chord rod; 7- lower chord rod; 8- web rod; 9- connecting plate; 10- rivet; 11- parabolic collector using support wing and torsion ring; 12- support column. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] See also Figure 1-5 The present invention provides a parabolic collector support structure combining support wings and torsion rings, including a plurality of groups of support units connected side by side, constituting the entire parabolic collector support structure for carrying the mirror. Each group of support units includes a fixedly connected support wing and a torsion ring, both of which are located in the same plane; each support wing includes a plurality of upper chord rods 6, a web rod 8 and a lower chord rod 7, and each torsion ring includes a steel ring 3, a plurality of flexible tie rods 5 and a steel pipe 4.

[0030] The upper chord 6 and the lower chord 7 are connected by a plurality of web members 8 to form a parabolic opening structure. In practical applications, the plane where the upper chord 6, the web members 8 and the lower chord 7 are located is perpendicular to the mirror plane; the steel ring 3 of each support unit is coaxially arranged, and the steel pipe 4 passes through the center of the steel ring 3 of each support unit and is fixedly connected to each of the steel rings 3 through a flexible pull rod 5.

[0031] Connection nodes are respectively provided between the steel ring 3 and the upper chord 6 and the lower chord 7, so that the support wing and the torsion ring are fixedly connected. In practical applications, the two rotate synchronously; the support wings in each group of the support units are connected by a plurality of purlins 1, that is, the purlins 1 are laid flat and fixed on the upper chord 6 of each support wing along the layout direction of the support wings (parallel to the direction of the steel pipe 4), and the torsion rings in adjacent support units are connected by diagonal rods 2.

[0032] With this arrangement, the collector support structure is divided into two parts, the support wing and the torsion ring, both of which are made of common Q355B steel. The support wing is responsible for bearing the weight of the mirror, and the torsion ring is responsible for transmitting the torque of the driver. The clear division of labor can improve the utilization rate of materials, reduce the use of steel, and reduce costs. The steel pipe 4 is connected to the steel ring 3 through a flexible pull rod 5, which not only balances the center of gravity and the rotating shaft and reduces the driving torque of the driver, but also introduces the principle of a tuned mass damper. Under extreme working conditions, when the collector is vibrated by external force, the inertia of the steel pipe 3 can absorb the vibration energy, reduce the possibility of tilting and shaking, and reduce the vibration amplitude, thereby improving the stability of the collector.

[0033] Specifically, a first connection node is set between the top of the steel ring 3 and the upper chord rod 6, and a second connection node and a third connection node are set between the top of the steel ring 3 and the lower chord rod 7. The diameter of the steel ring 3 is greater than the vertical distance between the upper chord rod 6 and the lower chord rod 7, so that the second connection node and the third connection node are symmetrically distributed on both sides of the upper semicircle of the steel ring 3, such as Figure 2 .

[0034] The upper chord rods 6 form an upper parabola structure, the lower chord rods 7 form a lower parabola structure, the web rods 8 are staggered and fixed between the upper chord rods 6 and the lower chord rods 7, and the web rods 8 are connected to the upper chord rods 6 and the lower chord rods 7 by welding. The upper parabola structure formed by the upper chord rods 6 is a continuous and uninterrupted structure, and the lower parabola structure formed by the lower chord rods 7 is discontinuous between the second connection node and the third connection node, that is, the steel ring 3 is located directly below the upper chord rods 6 and is fixedly connected to the support wing through three connection nodes. The three connection nodes are all connected by rivets, such as Figure 4 The welding ear plate at the end of the upper chord rod 6 is connected to the connecting plate 9 on the torque ring through a rivet 10.

[0035] The opening width of the parabolic opening structure of the support wing is greater than the diameter of the torsion ring, and is preferably 3-4 times the diameter of the torsion ring. In some specific embodiments, the diameter of the torsion ring is 2600mm, and the parabolic opening width of the support wing is 8471.1±0.5mm. The present invention makes the division of labor of the collector structure in bearing mirror load and transmitting torque clearer through the combination of the support wing and the torsion ring. On this basis, while ensuring the stability of the support structure, the opening width of the collector can be increased through measurement, and a larger concentration ratio (the ratio of the opening width to the height of the groove) can be obtained, thereby improving the optical efficiency. Compared with traditional collectors, a large number of lightweight rods are used, which is easy to assemble and transport, and reduces costs.

[0036] The support wing and torsion ring combined heat collector support structure designed by the present invention, the support wing is responsible for bearing the mirror load, and the torsion ring is responsible for transmitting the torque. The structural form of the support wing is a plane tube truss, the rod of the support wing is a square tube, the chord is the main pipe, the web 8 is the branch pipe, and the nodes of the chord and the web 8 are welded (the use of hinges for structural design during calculation can improve the efficiency of material use. In actual engineering, welding can generally be used instead of hinges to approximately achieve the effect of hinges). The force system of the structure is simple and direct, the cross-sectional utilization efficiency is high, the cross-sectional size of the rod is small, the length is short, and the risk of instability is low. Intersecting nodes and welded plate nodes are both commonly used node connection forms in steel structures, with mature technology and simple structure.

[0037] Twelve flexible tie rods 5 are fixed between each of the steel rings 3 and the steel pipes 4, and each of the flexible tie rods 5 is evenly spaced, so that the gravity of the steel pipes 4 is evenly distributed on the steel rings 3, which makes maintenance easier and reduces difficulty.

[0038] The connection node of the diagonal rod 2 on the steel ring 3 coincides with the connection node of the flexible pull rod 5, and each diagonal rod 2 is staggered between two adjacent steel rings 3. Twelve diagonal rods 2 are connected between two adjacent steel rings 3, and one end of two adjacent diagonal rods 2 shares a connection node. The diagonal rod 2 of the torsion ring is a round tube, and each steel ring 3 is connected by the diagonal rod 2. The two ends of the diagonal rod 2 are fixed to the steel ring 3 by welding, which reduces the length coefficient of the instability calculation to half the rod length, reducing the risk of instability. All welding work is completed in the factory, reducing the amount of on-site welding, improving the quality of node connection, and ensuring node reliability.

[0039] The present invention uses a torsion ring that connects the steel pipe 4 and the steel ring 3 through a flexible tie rod 5 to construct a shock absorbing system. The steel pipe 4 accounts for most of the weight in the lower torsion ring structure. In addition to balancing the center of gravity with the rotating shaft and reducing the driving torque of the driver, it also has the function of tuning mass damper shock absorption. According to the principle of the tuned mass regulator, when facing extreme working conditions, the collector is vibrated by external forces, and the steel pipe 4 can absorb the energy of the collector vibration through its inertia, reduce the possibility of tilting and shaking, reduce the vibration amplitude, improve the stability of the collector, and reduce maintenance costs.

[0040] See also Figure 5 The present invention also provides a parabolic collector 11, comprising the parabolic collector support structure described above, a heat collecting unit arranged on the parabolic collector support structure, and a driving unit for driving the parabolic collector support structure to rotate. In actual assembly, the parabolic collector support structure needs to be connected to the corresponding support column 12, and equipped with a fixed type of heat collecting tube ( Figure 5Not shown), the reflective trough (parabolic opening structure) focuses sunlight onto the collector tube. As the sun moves, the driving unit drives the reflective trough to adjust its angle to maintain optimal reception of sunlight.

[0041] In summary, the present invention provides a parabolic collector support structure that combines support wings and torsion rings, organically combining the three support forms of torque tubes, torque boxes, and space frames to create a new collector structure that has significant advantages in structural innovation and optical efficiency improvement, shock absorption system and stability enhancement, structural optimization and cost-effectiveness. Through the innovative design that combines support wings with torsion rings, not only the collector concentration ratio performance is improved, but also progress has been made in material cost control and structural stability, reducing the cost of collector manufacturing and operation. These optimization measures make the collector more suitable for large-scale production and application, and have good application prospects and practical significance for actual engineering.

[0042] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A parabolic collector support structure with a combined support wing and a torsion ring, characterized in that: It comprises a plurality of groups of support units connected in parallel, each group of the support units comprises a support wing and a torsion ring which are fixedly connected; the support wing comprises a plurality of upper chord rods (6), a plurality of web rods (8) and a plurality of lower chord rods (7); the torsion ring comprises a steel ring (3), a plurality of flexible pull rods (5) and a steel pipe (4); The upper chord (6) and the lower chord (7) are connected via the web (8) to form a parabolic opening structure; the steel pipe (4) passes through the center of the steel ring (3) of each supporting unit and is fixedly connected to the steel ring (3) via the flexible pull rod (5); The steel ring (3) is provided with connection nodes respectively between the upper chord (6) and the lower chord (7); the support wings in each group of the support units are connected by a plurality of purlins (1), and the torsion rings in adjacent support units are connected by diagonal rods (2).

2. The parabolic collector support structure with combined support wings and torsion rings according to claim 1 is characterized in that: A first connection node is arranged between the top of the steel ring (3) and the upper chord (6), and a second connection node and a third connection node are arranged between the top of the steel ring (3) and the lower chord (7).

3. The parabolic collector support structure with combined support wings and torsion rings according to claim 2 is characterized in that: The diameter of the steel ring (3) is greater than the vertical distance between the upper chord (6) and the lower chord (7), so that the second connection node and the third connection node are symmetrically distributed on both sides of the upper semicircle of the steel ring (3).

4. The parabolic collector support structure with combined support wings and torsion rings according to claim 2 is characterized in that: The first connection node, the second connection node and the third connection node are all connected by rivets.

5. The parabolic collector support structure with combined support wings and torsion rings according to claim 1, characterized in that: The opening width of the parabolic opening structure of the support wing is larger than the diameter of the torsion ring, and is preferably 3-4 times the diameter of the torsion ring.

6. The parabolic collector support structure with combined support wings and torsion rings according to claim 1, characterized in that: The upper chord (6) forms an upper parabola structure, the lower chord (7) forms a lower parabola structure, the web (8) is staggered and fixed between the upper chord (6) and the lower chord (7), and the web (8) is connected to the upper chord (6) and the lower chord (7) by welding.

7. The parabolic collector support structure with combined support wings and torsion rings according to claim 1, characterized in that: Twelve flexible pull rods (5) are fixed between each of the steel rings (3) and the steel pipe (4), and each of the flexible pull rods (5) is distributed at equal intervals.

8. The parabolic collector support structure with combined support wings and torsion rings according to claim 1, characterized in that: The connection node of the inclined rod (2) on the steel ring (3) coincides with the connection node of the flexible pull rod (5), and each of the inclined rods (2) is staggeredly distributed between two adjacent steel rings (3).

9. The parabolic collector support structure with combined support wings and torsion rings according to claim 8, characterized in that: Twelve oblique rods (2) are connected between two adjacent steel rings (3), and one end of two adjacent oblique rods (2) shares a connection node.

10. A parabolic collector, characterized in that: It comprises the parabolic collector support structure according to any one of claims 1 to 9, a heat collecting unit arranged on the parabolic collector support structure, and a driving unit for driving the parabolic collector support structure to rotate.

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