A trough solar energy district heating system

Abstract

The application discloses a groove type solar regional heating system, and relates to the technical field of solar energy, which comprises a main positioning module, a mirror panel module and a heat collecting pipe are arranged on the main positioning module; the mirror panel module comprises a main mirror panel and a vice mirror panel, the main mirror panel is fixedly arranged directly below the heat collecting pipe, one vice mirror panel is arranged on each side of the main mirror panel, and a spacing space is reserved between each vice mirror panel and the main mirror panel; the two vice mirror panels are connected to the main positioning module through a group of vice positioning modules; the heat collecting pipe is arranged on the main positioning module through a light spot tracking module; a linear moving module is arranged on the main positioning module, the linear moving module is below the main mirror panel, a cleaning module is connected to a moving end of the linear moving module, the cleaning module is connected to the two spacing spaces and contacts the upper surfaces of the main mirror panel and the vice mirror panel. The system improves the heat collecting efficiency and operation stability, can automatically complete positioning, heat collecting and cleaning operations, and has high practicability and economy.

Description

Technical Field

[0001] This invention relates to the field of solar energy technology, and more specifically, to a parabolic trough solar district heating system. Background Technology

[0002] With the increasing urgency of energy structure transformation and energy conservation and emission reduction, solar energy, as a clean and renewable energy source, is being used more and more widely in district heating. Among them, parabolic trough solar thermal collector systems have become one of the important technical solutions for district heating due to their relatively simple structure and high heat collection efficiency. However, existing parabolic trough solar district heating systems still face many technical bottlenecks in practical applications, which restrict further improvements in their heat collection efficiency and operational stability.

[0003] First, traditional solar trough systems typically use fixed or individually driven mirror panels, allowing only rough angle adjustments based on the approximate sun position, failing to achieve precise real-time tracking. Second, the collector tubes in existing systems are usually fixed in position, neglecting the shift in the reflected light spot on the mirror panel as the sun's position changes. When the reflected light spot changes position, the fixed collector tubes cannot adjust their position promptly to receive the maximum area of ​​light, further reducing the system's heat collection efficiency and making it difficult to meet the stable heat output requirements of district heating. Third, the mirror panels of trough solar systems are constantly exposed to the outdoor environment, easily accumulating dust, fallen leaves, bird droppings, and other debris. These contaminants significantly reduce the reflectivity of the mirror panels, leading to a continuous decline in heat collection efficiency. The entire system suffers from poor operational consistency, making it difficult to consistently and stably provide sufficient heat for district heating in complex and variable outdoor environments. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art above, and to propose a trough-type solar district heating system.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A trough-type solar district heating system includes a main positioning module, on which a mirror panel module and a heat collection tube are mounted. The mirror panel module performs initial positioning based on the real-time position of the sun and concentrates solar radiation heat onto the heat collection tube. The mirror panel module includes a main mirror panel and secondary mirror panels. The main mirror panel is fixedly positioned directly below the heat collection tube, and a secondary mirror panel is distributed on each side of it, with a pre-existing gap between each secondary mirror panel and the main mirror panel. Each of the two secondary mirror panels is connected to the main positioning module via a set of secondary positioning modules, allowing the secondary mirror panels to be positioned relative to the main positioning module. The system performs secondary positioning based on the sun's position, allowing the reflected solar heat from the sun and the reflected heat from the primary mirror panel to converge onto the heat collection tube. The heat collection tube is mounted on the main positioning module via a spot tracking module, enabling it to dynamically adjust its position to capture and track the spot of light reflected from the secondary mirror panel. The main positioning module is equipped with a linear motion module located below the primary mirror panel, with its moving end connected to a cleaning module. The cleaning module connects to two spaced intervals and contacts the upper surfaces of the primary and secondary mirror panels, allowing it to reciprocate along the north-south direction of the primary and secondary mirror panels and perform cleaning actions.

[0007] Furthermore, the above solution includes a base frame with a first mounting base on it. A first drive motor is mounted on the first mounting base, and the first drive motor is connected to a first rotating rod. The first rotating rod is rotatably mounted on the first mounting base, and a second mounting base is mounted on it, allowing the second mounting base to perform angle adjustment in the north-south direction. The second mounting base has a second drive motor connected to a second rotating rod, which is rotatably mounted on the second mounting base and connected to a mounting frame via a fixed beam, allowing the mounting frame to perform angle adjustment in the east-west direction. The mounting frame includes a first sunlight sensor, a main mirror panel, a secondary positioning module, a light spot tracking module, and a linear motion module.

[0008] Furthermore, the above scheme includes angle encoders installed on the first and second rotating rods to provide real-time feedback on the actual angles of the mounting frame in the north-south and east-west directions, forming a closed-loop control of the target angle and the actual angle with the solar position data collected by the first solar radiation sensor.

[0009] Furthermore, the above solution includes a third mounting base, which is mounted on a mounting frame and has a third drive motor. The third drive motor is connected to a third rotating rod, which is rotatably mounted on the third mounting base and has a bracket on it, so that the bracket can perform east-west angle adjustment. The bracket has a second sunlight sensor and a secondary mirror panel.

[0010] Furthermore, the above solution includes a light spot tracking module comprising two electric push rods vertically mounted on a mounting frame, all connected to a fixed frame. The fixed frame is equipped with a light spot sensor and a heat collection tube. The two light spot sensors are respectively located at the positions of the heat collection tubes to receive light spots reflected from the two secondary mirror panels.

[0011] Furthermore, the linear motion module includes a fourth drive motor mounted on the mounting frame. The fourth drive motor is connected to a lead screw. The lead screw is rotatably mounted in the north-south direction of the mounting frame and has a guide rod on one side. The guide rod is fixedly mounted in the north-south direction of the mounting frame, and a slider is mounted on both the guide rod and the lead screw. A cleaning module is mounted on the slider.

[0012] Furthermore, the cleaning module includes two connecting rods symmetrically arranged on the slider. Each connecting rod is connected to a space and a hinge block. An inner cleaning brush is hinged between the two hinge blocks and contacts the surface of the main mirror panel. An outer cleaning brush is hinged to each hinge block and contacts the surfaces of two secondary mirror panels.

[0013] Furthermore, the above solution includes a cavity on the slider, which is connected to an external air source inlet pipe; the connecting rod, inner cleaning brush, and outer cleaning brush are all hollow, and the connecting rod is connected to the cavity. The connecting rod is connected to the inner cleaning brush and the outer cleaning brush respectively through a flexible tube, and the bottom surface of the inner cleaning brush and the outer cleaning brush are provided with air ports for gas to be blown out.

[0014] Furthermore, the above scheme includes a phase change heat storage tank connected in series in the heat exchange circuit of the heat collection tube, so that when there is sufficient heat, the heat energy is stored in the heat storage tank, and when there is insufficient heat, the heat storage tank releases heat energy to supplement the heating. An air source heat pump interface is reserved so that when the heat storage is insufficient, the air source heat pump can be started to form a composite heating mode.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention employs a dual positioning mechanism of primary positioning and secondary positioning. The primary positioning module drives the mirror panel module to complete the initial positioning, laying a precise foundation for heat convergence. Two sets of secondary positioning modules then perform secondary fine-tuning of the angles of the secondary mirror panels on both sides, ensuring that the solar radiation reflected by the primary mirror panel and the two secondary mirror panels can be collaboratively converged to the heat collection tube, forming a three-in-one high-efficiency heat collection mode. Compared to the traditional single positioning method, this dual positioning mechanism can adapt to real-time changes in solar altitude and azimuth angles, significantly reducing heat loss due to positioning deviations and significantly improving the efficiency of solar radiation heat convergence. Simultaneously, the light spot tracking module captures the position of the light spot reflected by the secondary mirror panels in real time and dynamically drives the heat collection tube to adjust its position, ensuring that the heat collection tube is always in the optimal position to receive the maximum light spot reflected by the two secondary mirror panels, providing a stable and sufficient heat source for district heating.

[0017] 2. The linear movement module and the cleaning module of this invention form an integrated automatic cleaning mechanism. The cleaning module is connected to the gap space between the main mirror panel and the secondary mirror panel, and can contact the upper surfaces of the main mirror panel and the secondary mirror panel at the same time. The linear movement module drives the cleaning module to move back and forth along the north-south direction of the mirror panel module to complete the automatic cleaning operation, ensuring that the surface of the mirror panel is always kept clean and effectively avoiding the problem of decreased reflectivity caused by the accumulation of debris. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0020] Figure 3 This is a diagram showing the installation location of the hose;

[0021] The components include: 1. Main positioning module; 11. Base frame; 12. First mounting base; 13. First drive motor; 14. First rotating rod; 15. Second mounting base; 16. Second drive motor; 17. Second rotating rod; 18. Fixed beam; 19. Mounting bracket; 110. First solar sensor; 2. Mirror panel module; 21. Main mirror panel; 22. Secondary mirror panel; 3. Heat collection tube; 4. Secondary positioning module; 41. Third mounting base; 42. Third drive motor. 43. Third rotating rod; 44. Bracket; 45. Second sunlight sensor; 5. Spot tracking module; 51. Electric push rod; 52. Fixing frame; 53. Spot sensor; 6. Linear movement module; 61. Fourth drive motor; 62. Lead screw; 63. Guide rod; 64. Slider; 641. Cavity; 7. Cleaning module; 71. Connecting rod; 72. Hinge block; 73. Inner cleaning brush; 74. Outer cleaning brush; 741. Air port; 75. Hose. Detailed Implementation

[0022] 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 a part of the embodiments of the present invention, and not all of them. 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. The present invention will be further described with reference to the accompanying drawings and embodiments:

[0023] A trough-type solar district heating system, as shown in the attached document. Figure 1 As shown, the system includes a main positioning module 1, on which a mirror panel module 2 and a heat collection tube 3 are mounted. The main positioning module 1 can drive the mirror panel module 2 to complete its initial positioning based on the real-time position of the sun, thereby efficiently converging solar radiation heat to the heat collection tube 3 and achieving initial heat energy collection. The mirror panel module 2 includes a main mirror panel 21 and secondary mirror panels 22. The main mirror panel 21 is fixedly positioned directly below the heat collection tube 3 as the core reflective unit for heat convergence, and a secondary mirror panel 22 is distributed on each of its two sides. A gap is reserved between each secondary mirror panel 22 and the main mirror panel 21. Each of the two secondary mirror panels 22 is connected to the main positioning module 1 through a set of secondary positioning modules 4, allowing the secondary mirror panels 22 to perform secondary, refined positioning based on the sun's position, ensuring that the solar heat reflected by the secondary mirror panels 22 can be converged with the reflected heat from the main mirror panel 21 to the heat collection tube 3, maximizing the heat collection effect. The heat collection tube 3 is mounted on the main positioning module 1 via a light spot tracking module 5. The light spot tracking module 5 can capture and track the light spot reflected by the secondary mirror panel 22 in real time, driving the heat collection tube 3 to dynamically adjust its position, thus always being in the optimal position to receive the maximum light spot reflected by the two secondary mirror panels 22, further enhancing the heat collection efficiency. In addition, the main positioning module 1 is equipped with a linear movement module 6, which is located below the main mirror panel 21 and its moving end is connected to a cleaning module 7. The cleaning module 7 is connected to two spaced intervals and contacts the upper surfaces of the main mirror panel 21 and the secondary mirror panel 22. By driving the cleaning module 7 to move back and forth along the north-south direction of the mirror panel module 2 through the linear movement module 6, the surface of the mirror panel module 2 can be automatically cleaned, effectively avoiding the impact of dust and debris accumulation on the reflection efficiency.

[0024] In its specific implementation, this invention also includes a control module, which adopts the PLC control method in the prior art, and will not be described in detail here. This application takes the main positioning module 1 as the core base. The main positioning module 1 drives the mirror panel module 2 to complete the initial positioning and establish the heat gathering direction. Then, two sets of secondary positioning modules 4 make secondary fine adjustments to the secondary mirror panel 22 to achieve coordinated focusing of light from the main and secondary mirrors. Then, the light spot tracking module 5 drives the heat collection tube 3 to dynamically track the light spots reflected from the two secondary mirror panels 22, so that the heat collection tube 3 is always in the optimal heat gathering position to maximize the heat gathering. When it is necessary to clean the mirror panel module 2, the linear movement module 6 drives the cleaning module 7 to clean back and forth to ensure the high reflectivity of the main mirror panel 21 and the secondary mirror panel 22. In use, the system can automatically perform the initial positioning of the mirror panel module 2 based on the sun's position data through the main positioning module 1. The secondary positioning module 4 simultaneously fine-tunes the angle of the secondary mirror panel 22, and the light spot tracking module 5 captures the light spot in real time and drives the heat collection tube 3 to adjust its position. At the same time, the linear movement module 6 is started at a set frequency (such as once or multiple times a day, depending on the actual environment) to drive the cleaning module 7 to clean the mirror panel module 2 back and forth in the north-south direction (such as once or multiple times, depending on the actual environment). The entire process can stably provide heating energy to the area without human intervention.

[0025] For the above scheme, please refer to the appendix for details. Figure 1 and attached Figure 2 As shown, the main positioning module 1 includes a base frame 11, on which a first mounting base 12 is provided. The first mounting base 12 is provided with a first drive motor 13, which is connected to a first rotating rod 14. The first rotating rod 14 is rotatably mounted on the first mounting base 12 and a second mounting base 15 is provided thereon, so that the second mounting base 15 can perform angle adjustment in the north-south direction. The second mounting base 15 is provided with a second drive motor 16, which is connected to a second rotating rod 17. The second rotating rod 17 is rotatably mounted on the second mounting base 15 and a mounting frame 19 is connected thereon through a fixed beam 18, so that the mounting frame 19 can perform angle adjustment in the east-west direction. The mounting frame 19 is provided with a first sunlight sensor 110, a main mirror panel 21, a secondary positioning module 4, a light spot tracking module 5, and a linear movement module 6.

[0026] In this design, the main positioning module 1 uses the base frame 11 as its support. The first drive motor 13 on the first mounting base 12 drives the first rotating rod 14, which in turn drives the second mounting base 15 to adjust the angle in the north-south direction. Then, the second drive motor 16 on the second mounting base 15 drives the second rotating rod 17, which, with the help of the fixed beam 18, drives the mounting frame 19 to adjust the angle in the east-west direction. At the same time, the first solar radiation sensor 110 on the mounting frame 19 captures solar position data in real time, providing a precise basis for angle adjustment. This enables the main mirror panel 21, the secondary positioning module 4, and other core components on the frame to complete their initial positioning, laying a stable foundation for the subsequent fine adjustment of the secondary positioning module 4. In use, the first solar radiation sensor 110 collects and feeds back solar position information in real time. Based on this, the control module controls the first drive motor 13 and the second drive motor 16 to start respectively. Through the rotation of the first rotating rod 14 and the second rotating rod 17, the mounting frame 19 is adjusted to the appropriate angle synchronously or stepwise in the north-south and east-west directions, completing the initial positioning of the mirror panel module 2 and providing directional assurance for efficient heat concentration.

[0027] In addition, angle encoders (not shown in the figure) are installed on the first rotating rod 14 and the second rotating rod 17 to provide real-time feedback on the actual angles of the mounting frame 19 in the north-south and east-west directions. This forms a closed-loop control between the target angle and the actual angle with the solar position data collected by the first solar radiation sensor 110. When the system experiences a slight shift in the mounting frame 19 due to strong winds or temperature changes, the angle encoders can quickly capture the deviation. The first drive motor 13 and the second drive motor 16 perform sub-millimeter-level angle corrections to control the positioning error within ±0.1°, thus avoiding the cumulative error of traditional open-loop control.

[0028] For the above scheme, please refer to the appendix for details. Figure 1 and attached Figure 2 As shown, the secondary positioning module 4 includes a third mounting base 41, which is mounted on the mounting frame 19 and has a third drive motor 42. The third drive motor 42 is connected to a third rotating rod 43, which is rotatably mounted on the third mounting base 41 and has a bracket 44 on it, so that the bracket 44 can perform east-west angle adjustment. The bracket 44 has a second sunlight sensor 45 and a secondary mirror panel 22.

[0029] In this design, the secondary positioning module 4 is based on the third mounting base 41. The third drive motor 42 drives the third rotating rod 43 to rotate, causing the bracket 44 and the secondary mirror panel 22 and the second solar sensor 45 on the bracket to simultaneously adjust their east-west angles. The second solar sensor 45 captures detailed solar position data in real time, providing precise control data for the third drive motor 42. Based on the initial positioning by the main positioning module 1, the secondary mirror panel 22 undergoes a secondary, refined angle adjustment, ensuring that its reflected light and the reflected light from the main mirror panel 21 converge to the heat collection tube 3. This allows for precise independent adjustment of a single secondary mirror panel 22, compensating for minor deviations in the main positioning and improving heat collection accuracy. During use, the second solar sensor 45 collects and feeds back solar position information in real time. The control module, combined with the basic angle of the main positioning, controls the third drive motor 42 to start. The third rotating rod 43 then drives the bracket 44 and the secondary mirror panel 22 to make fine adjustments in the east-west angle, completing the secondary positioning and ensuring optimal heat collection.

[0030] For the above scheme, please refer to the appendix for details. Figure 1 and attached Figure 2 As shown, the light spot tracking module 5 includes an electric push rod 51 vertically mounted on the mounting bracket 19. There are two electric push rods 51, which are connected to a fixed bracket 52. The fixed bracket 52 is equipped with a light spot sensor 53 and a heat collection tube 3. There are two light spot sensors 53, which are respectively located at the position of the heat collection tube 3, for receiving light spots reflected from the two secondary mirror panels 22.

[0031] In this design, the light spot tracking module 5 uses two electric push rods 51 as its driving core, which are connected to the mounting bracket 52 that carries the heat collection tube 3 and the two light spot sensors 53. The two light spot sensors 53 capture the position of the light spot reflected by the corresponding secondary mirror panel 22 in real time, and precisely control the extension and retraction of the two electric push rods 51 accordingly. This drives the mounting bracket 52 and the heat collection tube 3 to dynamically adjust their positions, ensuring that the heat collection tube 3 is always in the optimal position to receive the maximum light spot reflected by the two secondary mirror panels 22, thus avoiding heat waste. During use, the two light spot sensors 53 continuously monitor the position of the reflected light spot of the corresponding secondary mirror panel 22 and feed back the data. The control module synchronously controls the extension and retraction of the two electric push rods 51 according to the light spot offset, driving the mounting bracket 52 and the heat collection tube 3 to adjust to the optimal receiving position, ensuring maximum heat collection efficiency.

[0032] For the above scheme, please refer to the appendix for details. Figure 1 and attached Figure 2As shown, the linear motion module 6 includes a fourth drive motor 61 mounted on the mounting frame 19. The fourth drive motor 61 is connected to a lead screw 62. The lead screw 62 is rotatably mounted in the north-south direction of the mounting frame 19 and has a guide rod 63 on one side. The guide rod 63 is fixedly mounted in the north-south direction of the mounting frame 19, and a slider 64 is provided on the guide rod 63 and the lead screw 62. A cleaning module 7 is provided on the slider 64.

[0033] In this design, the linear motion module 6 is powered by a fourth drive motor 61. The fourth drive motor 61 is connected to a lead screw 62 arranged along the east-west direction of the mounting frame 19. A fixed guide rod 63 is provided parallel to one side of the lead screw 62. The slider 64 cooperates with the lead screw 62 and the guide rod 63 and is connected to the cleaning module 7. The fourth drive motor 61 drives the lead screw 62 to rotate in both directions. Under the guidance of the guide rod 63, the slider 64 is driven to move back and forth in the north-south direction, thereby driving the cleaning module 7 to move synchronously to complete the cleaning. In use, the cleaning frequency is set according to the contamination of the mirror panel module 2. The control module controls the fourth drive motor 61 to start. The lead screw 62 drives the slider 64 and the cleaning module 7 to move back and forth in the north-south direction through the forward and reverse rotation, so as to automatically clean the surfaces of the main mirror panel 21 and the secondary mirror panel 22 and ensure the reflection efficiency of the mirror panel.

[0034] For the above scheme, please refer to the appendix for details. Figure 1 and attached Figure 2 As shown, the cleaning module 7 includes two connecting rods 71 ​​symmetrically arranged on the slider 64. Each connecting rod 71 is connected to a pitch space and a hinge block 72. An inner cleaning brush 73 is hinged between the two hinge blocks 72. The inner cleaning brush 73 contacts the surface of the main mirror panel 21. Each hinge block 72 is hinged with an outer cleaning brush 74. Each outer cleaning brush 74 contacts the surfaces of the two secondary mirror panels 22 respectively.

[0035] In this design, the cleaning module 7 is based on two connecting rods 71. When the linear motion module 6 moves the slider 64, the connecting rods 71 ​​synchronously drive the inner cleaning brush 73 and the outer cleaning brush 74 to move along the north-south direction of the mirror panel module 2 with the slider 64. Through the hinge structure, the inner cleaning brush 73 and the outer cleaning brush 74 can always be in contact with the surface of the mirror panel module 2 and will not be affected by the angle deflection of the sub-mirror panel 22, ensuring that the inner cleaning brush 73 and the outer cleaning brush 74 are in close contact with the mirror surface. In use, when the linear motion module 6 drives the slider 64 to move back and forth, the connecting rods 71 ​​drive the hinge block 72 and the connected inner cleaning brush 73 and outer cleaning brush 74 to move synchronously. The inner cleaning brush 73 cleans the main mirror panel 21, and the outer cleaning brushes 74 on both sides clean the corresponding sub-mirror panels 22 respectively, realizing the automated cleaning of the mirror panel module 2 in one movement and ensuring the high reflectivity of the mirror surface.

[0036] Regarding the above solutions, considering the cleaning effect, please refer to the appendix. Figure 3 As shown, a cavity 641 is provided on the slider 64, and the cavity 641 is connected to the external air source inlet pipe. The connecting rod 71, the inner cleaning brush 73 and the outer cleaning brush 74 are all hollow structures, and the connecting rod 71 is connected to the cavity 641. The connecting rod 71 is connected to the inner cleaning brush 73 and the outer cleaning brush 74 through a hose 75, and the bottom surface of the inner cleaning brush 73 and the outer cleaning brush 74 are provided with air ports 741 for blowing out gas.

[0037] In this design, cavity 641 serves as the core of the air source transfer mechanism. Cavity 641 is connected to an external air source inlet pipe and is also connected to a hollow connecting rod 71. The connecting rod 71 is then connected to a hollow inner cleaning brush 73 and an outer cleaning brush 74 via a hose 75. Air inlets 741 are provided on the bottom surfaces of the inner cleaning brush 73 and the outer cleaning brush 74. During use, external air enters cavity 641 of slider 64 through the inlet pipe, and then passes through the hollow connecting rod 71 and hose 75 to enter the interior of the inner cleaning brush 73 and the outer cleaning brush 74. Finally, it is blown out from the bottom air inlets 741. Combined with the movement and wiping of the cleaning brushes, a dual cleaning mode of air blowing and brush wiping is formed. First, the airflow blows away floating dust and small debris, and then the cleaning brushes wipe away stubborn stains, greatly improving the cleaning effect and ensuring the high reflectivity of the mirror surface.

[0038] It is worth mentioning that during the system implementation, a phase change thermal storage tank (not shown in the figure) is connected in series in the heat exchange loop of collector tube 3. The phase change thermal storage tank is filled with paraffin-based composite phase change material with a phase change temperature of 55-60℃, which is suitable for heating demand. When there is sufficient solar energy during the day, excess heat energy is stored in the storage tank; at night or on cloudy days when solar energy is insufficient, the storage tank releases heat energy to supplement heating. At the same time, an air source heat pump interface is reserved. When the heat storage is insufficient, the air source heat pump is automatically started, forming a composite heating mode of solar energy as the main source, air source heat pump as a supplement, and phase change thermal storage for peak regulation, ensuring a stable heat supply 24 hours a day.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A trough-type solar district heating system, comprising a main positioning module (1), wherein a mirror panel module (2) and a heat collection pipe (3) are provided on the main positioning module (1), so that the mirror panel module (2) performs initial positioning according to the real-time position of the sun and concentrates solar radiation heat to the heat collection pipe (3); characterized in that: in, The mirror panel module (2) includes a main mirror panel (21) and a secondary mirror panel (22). The main mirror panel (21) is fixedly arranged directly below the heat collection tube (3), and a secondary mirror panel (22) is distributed on each side of it. A gap space is reserved between each secondary mirror panel (22) and the main mirror panel (21). Among them, the two secondary mirror panels (22) are each connected to the main positioning module (1) through a set of secondary positioning modules (4) so ​​that the secondary mirror panel (22) can be repositioned according to the sun's position on the basis of the main positioning module (1), so that the solar heat reflected by it and the reflected heat of the main mirror panel (21) can be gathered together to the heat collection tube (3). Among them, the heat collection tube (3) is set on the main positioning module (1) through the light spot tracking module (5) so that the heat collection tube (3) can dynamically adjust its position to capture and track the light spot formed by the reflection of the secondary mirror panel (22); The main positioning module (1) is equipped with a linear movement module (6). The linear movement module (6) is located below the main mirror panel (21) and its moving end is connected to a cleaning module (7). The cleaning module (7) enters two gap spaces and contacts the upper surfaces of the main mirror panel (21) and the secondary mirror panel (22) so that the cleaning module (7) moves back and forth along the north-south direction of the main mirror panel (21) and the secondary mirror panel (22) and performs cleaning actions.

2. The trough-type solar district heating system according to claim 1, characterized in that: The main positioning module (1) includes a base frame (11), a first mounting base (12) is provided on the base frame (11), a first drive motor (13) is provided on the first mounting base (12), the first drive motor (13) is connected to a first rotating rod (14), the first rotating rod (14) is rotatably mounted on the first mounting base (12) and a second mounting base (15) is provided on it, so that the second mounting base (15) can perform angle adjustment in the north-south direction; The second mounting base (15) is provided with a second drive motor (16), the second drive motor (16) is connected to a second rotating rod (17), the second rotating rod (17) is rotatably mounted on the second mounting base (15) and a mounting frame (19) is connected to it through a fixed beam (18) so that the mounting frame (19) can perform east-west angle adjustment. The mounting bracket (19) is equipped with a first solar sensor (110), a main mirror panel (21), a secondary positioning module (4), a light spot tracking module (5), and a linear movement module (6).

3. A trough-type solar district heating system according to claim 2, characterized in that: An angle encoder is installed on the first rotating rod (14) and the second rotating rod (17) to provide real-time feedback on the actual angles of the mounting bracket (19) in the north-south and east-west directions, forming a closed-loop control of the target angle and the actual angle with the solar position data collected by the first solar sensor (110).

4. A trough-type solar district heating system according to claim 3, characterized in that: The sub-positioning module (4) includes a third mounting base (41), which is mounted on the mounting frame (19) and has a third drive motor (42) on it. The third drive motor (42) is connected to a third rotating rod (43), which is rotatably mounted on the third mounting base (41) and has a bracket (44) on it, so that the bracket (44) can perform east-west angle adjustment. The bracket (44) is equipped with a second solar sensor (45) and a secondary mirror panel (22).

5. A trough-type solar district heating system according to claim 4, characterized in that: The light spot tracking module (5) includes two electric push rods (51) vertically mounted on the mounting frame (19) and a common fixed frame (52). The fixture (52) is equipped with a light spot sensor (53) and a heat collection tube (3). There are two light spot sensors (53) and they are respectively located at the position of the heat collection tube (3) to receive the light spot reflected from the two secondary mirror panels (22).

6. A trough-type solar district heating system according to claim 5, characterized in that: The linear motion module (6) includes a fourth drive motor (61) mounted on the mounting frame (19). The fourth drive motor (61) is connected to a lead screw (62). The lead screw (62) is rotatably mounted in the north-south direction of the mounting frame (19) and has a guide rod (63) on one side. The guide rod (63) is fixedly mounted in the north-south direction of the mounting frame (19). A slider (64) is provided on the guide rod (63) and the lead screw (62). A cleaning module (7) is provided on the slider (64).

7. A trough-type solar district heating system according to claim 6, characterized in that: The cleaning module (7) includes two connecting rods (71) which are symmetrically arranged on the slider (64). Each connecting rod (71) is connected to a spacing space and a hinge block (72). Among them, an inner cleaning brush (73) is hinged between the two hinge blocks (72), and the inner cleaning brush (73) contacts the surface of the main mirror panel (21); Each hinge block (72) is hinged with an external cleaning brush (74), and each external cleaning brush (74) contacts the surfaces of the two secondary mirror panels (22).

8. A trough-type solar district heating system according to claim 7, characterized in that: The slider (64) has a cavity (641) which is connected to an external air source inlet pipe; Among them, the connecting rod (71), the inner cleaning brush (73) and the outer cleaning brush (74) are all hollow structures, and the connecting rod (71) is connected to the cavity (641). The connecting rod (71) is connected to the inner cleaning brush (73) and the outer cleaning brush (74) respectively through a hose (75). The bottom surface of the inner cleaning brush (73) and the outer cleaning brush (74) are provided with air ports (741) for blowing out gas.

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