Long-range line focusing heat absorber and assembling method thereof

Abstract

The invention discloses a long-range line focusing heat absorber and an assembling method thereof, and relates to the technical field of solar heat collection. Comprising a suspension support, a secondary reflector assembly and a heat collecting pipe assembly arranged on the reflecting surface of the secondary reflector assembly which are sequentially arranged below the suspension support, and a thermal expansion absorption assembly arranged between the suspension support and the backlight surface of the secondary reflector assembly, the thermal expansion absorption assembly is arranged on the backlight surface of the secondary reflective mirror assembly, so that the thermal expansion absorption assembly can operate in a long-term stable working temperature range, the service life of the thermal expansion absorption assembly is greatly prolonged, the reliability of the thermal expansion absorption assembly is greatly improved, and a connecting assembly on the backlight surface of the secondary reflective mirror and a hanging bracket above the connecting assembly are not irradiated by high-power reflected light; a large thermal expansion amount is not generated, and a special absorption mechanism is not needed.

Description

Technical Field

[0001] This invention relates to the field of solar thermal collector technology, specifically to a long-path focusing absorber and its assembly method. Background Technology

[0002] A linear Fresnel solar collector system is a type of linear focusing solar collector system. The main body of the receiver consists of vacuum collector tubes and secondary reflectors. To achieve high collection temperatures, the receiver is designed to be hundreds of meters or even over a kilometer long, consisting of numerous interconnected vacuum collectors and secondary reflectors. Due to the high collection temperatures, the thermal expansion of the vacuum collector tubes and their accessories in long-range receivers is very large, making thermal expansion mitigation crucial for the stable and reliable operation of long-range receivers. Conventional long-range receivers use expansion joints in adjacent collector tubes or combinations of multiple collector tubes to mitigate thermal expansion, with accessories using gaps to absorb this expansion. Therefore, the receiver has numerous expansion joints, resulting in high cost, short lifespan, and significantly shortened effective receiver length. Furthermore, the expansion joints require light-shielding designs and support devices, making installation extremely inconvenient. The receiver's accessories are typically exposed to high-magnification reflected light, and the high temperatures causing deformation of metal components also affect the system's reliable operation and lifespan.

[0003] Therefore, it is necessary to develop and design long-path focusing receivers and their assembly methods to ensure optical synchronization between the heat collection tube and the secondary reflector while preventing the receiver's auxiliary components from being directly irradiated by high-magnification light spots, thereby improving their service life. This is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a long-range focusing receiver and its assembly method, which ensures optical synchronization between the heat collection tube and the secondary reflector while preventing direct irradiation of the receiver's auxiliary components by high-magnification light spots, thereby improving its service life.

[0005] To achieve the above objectives, the present invention provides the following solution: A long-range focusing heat absorber includes a suspension bracket, a secondary reflector assembly arranged sequentially below the suspension bracket, a heat collection tube assembly disposed on the reflective surface of the secondary reflector assembly, and a heat expansion absorption assembly disposed between the suspension bracket and the backlight surface of the secondary reflector assembly. The thermal expansion absorption component includes a suspension rail mounted on the suspension bracket, a first roller slidably connected to the suspension rail, and a connecting rod with one end connected to the first roller and the other end connected to the heat collection tube assembly. The secondary reflector assembly includes at least two secondary reflectors, a frame for connecting adjacent secondary reflectors, and a suspension rod with one end connected to the frame and the other end connected to the suspension bracket. The boom is slidably connected to the rail via a second roller.

[0006] Preferably, the heat collection tube assembly includes at least two heat collection tubes and a clamp for connecting adjacent heat collection tubes, and the connecting rod is connected to the clamp.

[0007] Preferably, adjacent heat collection tubes are welded together, and both the weld points of adjacent heat collection tubes and the clamps are provided with heat insulation components.

[0008] Preferably, the secondary reflector is arranged correspondingly to the heat collection tube, and the connecting rod is located between adjacent secondary reflectors.

[0009] Preferably, at least one fixing rod is provided between the heat collection tube assembly and the suspension bracket, one end of the fixing rod is fixedly connected to the heat collection tube assembly, and the other end of the fixing rod is fixedly connected to the suspension bracket.

[0010] Preferably, the heat collection tube assembly is connected to an external pipe via a flexible tube.

[0011] Preferably, the suspension bracket is a portal frame, and the two arms of the portal frame are connected to the two side arms of the Y-shaped support. Sliding transition blocks are provided on the side walls of the two arms of the portal frame, and the lower edge of the secondary reflector cooperates with the sliding transition blocks.

[0012] This invention also discloses a method for assembling a long-range focusing receiver, using the long-range focusing receiver described above, characterized by comprising the following steps: Install suspension brackets; Connect one set of heat collection tubes and the secondary reflector that matches the heat collection tubes, and slide the assembled heat collection tubes and secondary reflector to the suspension bracket. Repeat the above steps until all the collector tubes are installed.

[0013] The present invention achieves the following technical effects compared to the prior art: By placing the thermal expansion absorption component on the back surface of the secondary reflector assembly, it is ensured that the thermal expansion absorption component can operate stably within a long-term temperature range, greatly extending its service life and reliability. This avoids the problems of slow plastic deformation and sliding mechanism jamming that can occur when the thermal expansion absorption component is placed on the reflective surface of the secondary reflector assembly due to high temperature. Moreover, the connecting components and the suspension bracket above the secondary reflector are not exposed to high-magnification reflected light and do not generate large amounts of thermal expansion, so no special absorption mechanism is required. By placing the heat collection tube assembly and the secondary reflector assembly on the same hanging rail, when the first roller is pushed, it moves as a whole with the heat collection tube, connecting rod, and the bracket of the aligned secondary reflector, achieving perfect optical synchronization. Furthermore, the secondary reflector assembly is suspended on the same hanging rail by the second roller, and the guide rail runs through the entire length of the suspension bracket, ensuring that the thermal expansion of the secondary reflector assembly and the heat collection tube can slide along the entire length of the suspension bracket. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Appendix Figure 1 This is a schematic diagram of the main view structure of the long-path focusing receiver disclosed in this invention; Appendix Figure 2 This is a top view structural schematic diagram of the long-path focusing receiver disclosed in this invention; Appendix Figure 3 This is a side view structural schematic diagram of the long-path focusing receiver disclosed in this invention; Appendix Figure 4 This is a side view of the long-path focusing receiver disclosed in this invention after removing the Y-shaped support column; Appendix Figure 5 This is a schematic diagram of the heat collection tube assembly structure in the long-path focusing receiver disclosed in this invention; Appendix Figure 6 This is a schematic diagram of the connection structure between the heat collection tube assembly and the suspension bracket in the long-path focusing receiver disclosed in this invention; Appendix Figure 7 This is a schematic flowchart of the assembly method for the long-path focusing receiver disclosed in this invention; The components include: 1. Suspension bracket; 2. Heat collection pipe; 3. Secondary reflector assembly; 4. Thermal expansion absorption assembly; 5. Hanging rail; 6. Connecting rod; 7. Secondary reflector; 8. Clamp; 9. Y-shaped support column; 10. First roller; 11. Frame; 12. Thermal insulation assembly; 13. Platform; 14. Second roller; 15. Hanging rod; 16. Sliding transition block; 17. Support arm. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] The purpose of this invention is to provide a long-path focusing receiver and its assembly method, so that the receiver's auxiliary components are not directly irradiated by high-magnification light spots, thereby improving their service life.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] refer to Figures 1-7 The long-range focusing receiver disclosed in this embodiment of the invention includes at least a suspension bracket 1. A secondary reflector assembly 3 is disposed below the suspension bracket 1. A heat collection tube assembly is disposed on the reflective surface of the secondary reflector assembly 3. A thermal expansion absorption assembly 4 is disposed between the suspension bracket 1 and the backlight surface of the secondary reflector assembly 3. The secondary reflector assembly 3 includes at least two secondary reflectors 7, which are connected by a frame 11. The frame 11 is connected to the suspension bracket 1 by a hanging rod 15. The reflectors are arranged in segments, and each heat collection tube 2 is provided with at least one secondary reflector 7. Each secondary reflector... The secondary reflector 7 itself also undergoes a slight expansion at the frame 11, but this expansion is absorbed by the segmented design and does not affect the shape of the mirror. The suspension rod 15 is slidably connected to the suspension rail 5 through the second roller 14. The secondary reflector assembly 3 is suspended on the same suspension rail 5 through the second roller 14. When the first roller 10 is pushed, it moves as a whole with the heat collection tube 2, the connecting rod 6 and the frame 11 of the secondary reflector 7 that is aligned with it. This movement will naturally pull or push the second roller 14, making it slide synchronously with the first roller 10, ensuring that the secondary reflector 7 and the heat collection tube 2 always maintain a fixed relative position during the thermal expansion process.

[0020] In this embodiment, by placing the thermal expansion absorption component 4 on the back surface of the secondary reflector component 3, it is ensured that the thermal expansion absorption component 4 can operate stably within a long-term temperature range, greatly extending its service life and reliability. This avoids the problems of slow plastic deformation and jamming of the sliding mechanism that would occur if the thermal expansion absorption component 4 were placed on the reflective surface of the secondary reflector component 3 under high temperature. Moreover, the connecting components on the back surface of the secondary reflector 7 and the upper suspension bracket 1 are not exposed to high-magnification reflected light and do not generate a large amount of thermal expansion, so no special absorption mechanism is required. By placing the heat collection tube assembly and the secondary reflector assembly on the same hanging rail, when the first roller is pushed, it moves as a whole with the heat collection tube, connecting rod and the bracket of the secondary reflector aligned with it, achieving perfect optical synchronization. Furthermore, the secondary reflector component 3 is suspended on the same hanging rail 5 by the second roller 14. The guide rail runs through the entire length of the suspension bracket 1, ensuring that the thermal expansion of the secondary reflector component 3 and the heat collection tube 2 can slide along the entire length of the suspension bracket 1.

[0021] It should be noted that when the hanger 15 is fixedly connected to the suspension bracket 1, the distance between adjacent secondary reflectors 7 is equal to the value of the thermal expansion of their corresponding adjacent heat collection tubes 2. refer to Figures 1-6 In one embodiment, the thermal expansion absorption component 4 includes a suspension rail 5 mounted on a suspension bracket 1. A first roller 10 is slidably connected to the suspension rail 5. The first roller 10 is connected to a connecting rod 6, and the end of the connecting rod 6 away from the first roller 10 is connected to the heat collection tube assembly. When the temperature of the heat collection tube 2 rises, the heat collection tube 2 will significantly elongate along its axial direction (i.e., the direction of the geodesic line). The expansion of the heat collection tube 2 will generate a huge thrust at its two end support points. This thrust is transmitted to the first roller 10 through the connecting rod 6. The thrust generates a horizontal component force on the roller, which overcomes the frictional force and drives the first roller 10 to slide along the suspension rail 5. Through the sliding of the roller, physical space is provided for the elongation of the heat collection tube 2, thereby converting the "stress" that restricts its expansion into "displacement" and realizing the "absorption" of thermal expansion. Using the first roller 10 to slide on the track, compared with simple sliding friction, rolling friction has less resistance, more flexible movement, and can respond more accurately to thermal expansion and contraction, reducing the risk of jamming.

[0022] refer to Figures 1-6In one implementation, the heat collection tube assembly includes at least two heat collection tubes 2, which are connected to each other by a clamp 8. The clamp 8 is connected to the first roller 10 by a connecting rod 6. Long-range focusing systems are usually very long (tens or even hundreds of meters), which cannot be achieved with a single heat collection tube 2. The long heat collection tube 2 is divided into multiple segments (at least two segments), each of which is an independent heat collection tube 2 unit. When the heat collection tube 2 expands, all the heat collection tubes 2 are heated and will expand to both ends. This expansion force pushes the clamp 8, and the clamp 8 transmits the force to the first roller 10 through the connecting rod 6. The first roller 10 slides outward on the hanging rail 5 to make room for the expansion of the heat collection tubes 2 on both sides. The clamp 8 connects two heat collection tubes 2 at the same time and is connected to the reflector structure above through the connecting rod 6. This ensures that even during thermal expansion and contraction, the force is fully applied to the clamp 8, avoiding damage to the heat collection tube 2.

[0023] refer to Figures 1-6 As a preferred method, adjacent collector tubes 2 are welded together, and both the weld points of adjacent collector tubes 2 and the clamps 8 are equipped with thermal insulation components 12. The thermal insulation components 12 at the weld points significantly reduce the temperature fluctuation range of the weld points during actual operation, making the weld points as close as possible to the ambient temperature, thereby greatly reducing the thermal stress they bear, fundamentally avoiding thermal fatigue failure, and ensuring the safety and sealing of the connection. The thermal insulation components 12 between the clamps 8 and the collector tubes 2 effectively block the heat transfer path, ensuring that the clamps 8 are always in a relatively low-temperature and stable working environment, ensuring that the clamping force of the clamps 8 is stable and will not change due to its own thermal expansion and contraction, while preventing the heat in the collector tubes 2 from being lost from the bare tube section.

[0024] It should be noted that the thermal insulation component 12 can be one of rock wool layer, slag wool layer, or aerogel felt layer, used to wrap the welding point and the clamp 8.

[0025] refer to Figures 1-6 As one implementation method, the secondary reflector 7 is set up corresponding to the heat collection tube 2, and the connecting rod 6 is located between adjacent secondary reflectors 7. The segmented design allows for disassembly and replacement at the two nearest "joints" when a section of the heat collection tube 2 or secondary reflector 7 is damaged, ensuring the convenience of replacement.

[0026] refer to Figures 1-6As one implementation method, a Y-shaped support column 9 is provided below the suspension bracket 1 to achieve the support stability of the suspension bracket 1. The interval between adjacent Y-shaped support columns 9 is 8 meters to 10 meters, preferably 8 meters. While ensuring that the suspension bracket 1 can be stably supported, the structure is simple and easy to install. Moreover, in this embodiment, the suspension bracket 1 is only set on the Y-shaped support column 9, and the hanging rail 5 is set on the suspension bracket 1. Thermal expansion can be absorbed without setting up a complex support structure.

[0027] It should be noted that the Y-shaped support columns 9 are installed at 8-meter intervals. Above the Y-shaped support columns 9 is a portal frame. The secondary reflector assembly 3 and the heat collection tube 2 are constrained within the portal frame. Since the secondary reflector assembly 3 and the heat collection tube 2 are installed in a suspended manner and are located at a high altitude outdoors, they will sway laterally due to strong winds. The portal frame can limit the sway range of the secondary reflector assembly 3 and the heat collection tube 2, thereby preventing severe lateral deviation and damage. At the same time, it can ensure that the reflected light spot of the concentrator below the secondary reflector assembly 3 and the heat collection tube 2 is accurately projected onto the opening of the secondary reflector 7 in windy weather, and the reflected light spot does not overflow, thereby ensuring that the optical efficiency of the system does not decrease in windy weather.

[0028] The suspension bracket is a portal frame, with both arms 17 connected by Y-shaped supports 9. Sliding transition blocks 16 are installed on the side walls of both arms 17. Because the length of a single secondary reflector 7 is typically 2 meters, less than the 8-meter spacing of the Y-shaped supports 9, there is a certain deviation in the straightness of adjacent secondary reflectors 7. When a secondary reflector 7 deviates laterally due to strong winds or installation errors, its lower edge will abut against the arms 17 on both sides of the portal frame. During the thermal expansion of the heat collection tube 2, the secondary reflector 7... The lower edge slides on the support arms 17 on both sides. When the lower edge of the next secondary reflector 7 is not straight enough with the lower edge of the secondary reflector 7 that is currently passing through the column, the lower edge of the next secondary reflector 7 will get stuck on the support arm 17. As thermal expansion continues, the heat collection tube 2 will be pulled and damaged by the support arm 17. By setting sliding transition blocks 16 on both sides of the support arm 17 at the positions corresponding to the lower edge of the secondary reflector 7, the secondary reflectors 7 with inconsistent straightness can pass smoothly through the support arms 17 on both sides of the portal frame, ensuring the safe operation of the system under thermal expansion.

[0029] refer to Figures 1-6As one implementation method, at least one fixing rod is provided between the heat collection tube assembly and the suspension bracket 1. One end of the fixing rod is fixedly connected to the heat collection tube assembly, and the other end of the fixing rod is fixedly connected to the suspension bracket 1. That is, the heat collection tube assembly is provided with at least one fixing point on the suspension bracket 1, preferably one fixing point. The fixing point firmly fixes the heat collection tube assembly to a certain position on the suspension bracket 1. The expansion of all heat collection tubes 2 will start from this point and push to both sides, which makes the force of the whole system more reasonable and the movement more controllable.

[0030] refer to Figures 1-6 As one implementation method, the heat collection tube assembly is connected to the external pipeline through a flexible tube, which ensures a reliable connection between the absorber and the external pipeline during thermal displacement.

[0031] refer to Figure 7 The present invention also discloses a method for assembling a long-range focusing receiver, which uses the long-range focusing receiver described above, and the main steps are as follows: Install the suspension bracket 1, and install the Y-shaped support column 9 below the suspension bracket 1 to form the heat absorber structural frame; At the end of the suspension bracket 1, select the end with the higher elevation and build a high platform 13; Install the first section of the heat collection tube 2 and its matching secondary reflector 7 assembly on the high platform 13. Fix the first section of the heat collection tube 2 with the thermal expansion absorption component 4. Then, use the first roller 10 to push the heat collection tube assembly into the hanging rail 5. Then, use the second roller 14 to push the secondary reflector assembly 3 into the hanging rail 5. After that, install the second section of the heat collection tube 2 and its matching secondary reflector 7 assembly in sequence, pushing one section at a time until all the heat collection tubes 2 are installed.

[0032] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A long-range line-focusing heat absorber characterized by, The application relates to a solar energy collecting device, which comprises a hanging support, a secondary reflector assembly arranged below the hanging support in sequence, a heat collecting pipe assembly arranged on a reflecting surface of the secondary reflector assembly, and a thermal expansion absorbing assembly arranged between the hanging support and a back light surface of the secondary reflector assembly. The thermal expansion absorbing assembly comprises a hanging rail arranged on the hanging support, a first roller in sliding connection with the hanging rail, and a connecting rod connected with the first roller at one end and with the heat collecting pipe assembly at the other end. The secondary reflector assembly comprises at least two secondary reflectors, a supporting frame for connecting adjacent secondary reflectors, and a hanging rod connected with the supporting frame at one end and with the hanging support at the other end. The hanging rod is in sliding connection with the hanging rail through a second roller.

2. The long-range linear focusing heat absorber of claim 1, wherein, The heat collecting pipe assembly comprises at least two heat collecting pipes and a clamp for connecting adjacent heat collecting pipes, and the connecting rod is connected with the clamp.

3. The long range linear focusing trap of claim 2, wherein, Adjacent heat collecting pipes are welded, and the welding points of adjacent heat collecting pipes and the clamp are provided with heat preservation and insulation assemblies.

4. The long range linear focusing trap of claim 1, wherein, The secondary reflectors are correspondingly arranged with the heat collecting pipes, and the connecting rod is located between adjacent secondary reflectors.

5. The long range linear focusing trap of claim 1, wherein, At least one fixing rod is arranged between the heat collecting pipe assembly and the hanging support, one end of the fixing rod is fixedly connected with the heat collecting pipe assembly, and the other end of the fixing rod is fixedly connected with the hanging support.

6. The long range linear focusing trap of claim 1, wherein, The heat collecting pipe assembly is connected with external pipelines through flexible pipes.

7. The long range linear focusing trap of claim 1, wherein, The hanging support is a door-shaped frame, two supporting arms of the door-shaped frame are connected with two side arms of a Y-shaped support column, sliding transition blocks are arranged on side walls of the two supporting arms of the door-shaped frame, and lower edges of the secondary reflectors are matched with the sliding transition blocks.

8. A method of assembling a long-range linear focusing trap using the long-range linear focusing trap of any one of claims 1-7, wherein, The application further relates to a method for installing the solar energy collecting device, which comprises the following steps: installing the hanging support; connecting one group of heat collecting pipes and secondary reflectors matched with the heat collecting pipes, and slidingly connecting the assembled heat collecting pipes and secondary reflectors with the hanging support; repeating the above operation until all the heat collecting pipes are installed.

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