Solar heat collector
By incorporating a multi-reflection concentrator assembly in the solar collector and placing the collector tube at the center of rotation, the low efficiency and leakage problems of the rotary joint in traditional parabolic trough solar collectors are solved, achieving highly efficient optical and heat collection effects.
Patent Information
- Application Number
- CN202410736238.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-12-09
AI Technical Summary
Traditional parabolic trough solar collectors suffer from problems such as low heat collection efficiency, easy leakage of rotary joints, and high wind load, resulting in insufficient optical performance and service life.
The system employs a multi-concentrator assembly. A first reflector assembly reflects vertically incident sunlight onto a second concentrator, and the second and third concentrators focus the light onto the heat collection tube. This achieves multiple reflections and concentrations, improving both optical and heat collection efficiency. Simultaneously, the heat collection tube is positioned at the rotation center of the first reflector assembly to prevent leakage from the rotary joint.
It achieves high-concentration light, improves the optical and heat collection efficiency of solar collectors, reduces heat loss, and avoids leakage problems of the rotary joint of the collector tube.
Smart Images
Figure CN121089271A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of solar thermal power generation technology, and more specifically, to a solar collector. Background Technology
[0002] Parabolic trough solar collectors mount the collector tubes on the upper part of a parabolic trough reflector via a bracket. Sunlight incident on the parabolic reflector is reflected and focused onto the collector tube located at the focal line. Except for a small amount absorbed and reflected by the glass sleeve, most of the sunlight passes through the glass sleeve to the outer wall of the absorber tube, where it is absorbed by the solar selective absorption coating and converted into heat energy. The heat energy is then conducted and convection to the fluid inside the tube.
[0003] Traditional parabolic trough solar collectors have a relatively large light-gathering spot. Using large-diameter collector tubes would lead to increased heat loss, while using smaller-diameter collector tubes would result in light leakage and reduced optical efficiency, thus resulting in low solar collector efficiency.
[0004] Furthermore, because the collector tubes need to rotate with the reflector when tracking the sun, the rotating joints connecting them are prone to leakage, posing a safety risk. Additionally, during molten salt venting, the molten salt is prone to solidification at the rotating joints, leading to difficulties in venting. At the same time, parabolic trough solar collectors, due to their large openings, experience significant wind loads, requiring heavy supports to ensure they bear the load, resulting in a high unit weight for the collector.
[0005] Therefore, how to improve the heat collection efficiency of solar collectors has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0006] In view of this, the purpose of the present invention is to provide a solar collector to improve the heat collection efficiency of the solar collector.
[0007] To achieve the above objectives, the present invention provides the following technical solution:
[0008] A solar collector, comprising:
[0009] A concentrator assembly includes a first concentrator, a second concentrator, and a third concentrator. The first concentrator includes a support member and a first reflective component rotatably disposed on the support member. The first reflective component rotates around the rotation center of the first concentrator. The second concentrator and the third concentrator are respectively connected to the first reflective component, and the focusing center of the third concentrator coincides with the rotation center of the first reflective component.
[0010] The heat collection tube is positioned at the rotation center of the first reflective component;
[0011] The first reflective component is used to reflect vertically incident sunlight onto the second concentrator to form a first incident light on the second concentrator. The second concentrator is used to reflect the first incident light onto the heat collection tube and the third concentrator to form a second incident light on the third concentrator. The third concentrator is used to reflect the second incident light onto the heat collection tube.
[0012] Optionally, in the above-mentioned solar collector, the first reflective component includes a first bracket and at least two first parabolic reflectors with different focal lengths and confocal lines mounted on the first bracket, and there is a gap between two adjacent first parabolic reflectors for wind to pass through.
[0013] Optionally, in the above-described solar collector, the support includes a column and a tracking drive device disposed on the column. The tracking drive device is used to connect to the first bracket to drive the first reflective component to rotate around the rotation center.
[0014] Optionally, in the above-mentioned solar collector, the second concentrator includes a second parabolic reflector and a second bracket for mounting the second parabolic reflector, the second bracket being connected to the first bracket.
[0015] Optionally, in the above-mentioned solar collector, the tracking drive device is provided with a mounting hole for installing the heat collection tube, the heat collection tube is provided with a collar that slides with the mounting hole, and one end of the heat collection tube is inclined to the other end.
[0016] Optionally, in the above-mentioned solar collector, the heat collection tube includes a metal tube and an insulation layer located outside the metal tube, and the inner cavity of the metal tube is filled with a heat transfer medium.
[0017] Optionally, in the above-mentioned solar collector, the insulation layer is a transparent aerogel wrapped around the outer wall of the metal tube; or,
[0018] The insulation layer is a glass sleeve fitted over the outside of the metal tube, and a vacuum zone is provided between the glass sleeve and the metal tube.
[0019] Optionally, in the above-mentioned solar collector, the cross-section of the second concentrator is a convex parabola, and the focal line of the second concentrator is the same as that of the first concentrator, with the second concentrator and the first concentrator located on the same side of the focal line.
[0020] Optionally, in the above-mentioned solar collector, the cross-section of the second concentrator is a concave parabola, the focal line of the second concentrator is the same as that of the first concentrator, and the second concentrator and the first concentrator are located on opposite sides of the focal line.
[0021] Optionally, in the above-mentioned solar collector, the cross-section of the third concentrator includes at least one of a parabola, an involute, or a circular arc.
[0022] The solar collector provided by this invention comprises a first concentrator, a second concentrator, and a third concentrator. The first reflective component of the first concentrator is rotatably mounted on a support, allowing it to rotate around the rotation center of the first concentrator. The second and third concentrators are respectively connected to the first reflective component, with the concentrating center of the third concentrator coinciding with the rotation center of the first reflective component. A heat collection tube is positioned at the rotation center of the first reflective component. The first reflective component of the first concentrator reflects perpendicularly incident sunlight onto the second concentrator, forming a first incident light on the second concentrator. The second concentrator reflects the first incident light onto the heat collection tube and the third concentrator, forming a second incident light on the third concentrator. The third concentrator then reflects the second incident light onto the heat collection tube, thus creating a multi-reflection concentrating effect.
[0023] Compared with existing technologies, the solar collector provided by this invention employs a multi-reflection concentrating method. The first reflective component of the first concentrator reflects vertically incident sunlight onto the second concentrator, which then focuses the light onto the collector tube. Finally, a third concentrator reflects any light overflowing from the collector tube back onto it, achieving high-concentration light and improving both the optical and thermal efficiency of the solar collector. Furthermore, by placing the collector tube at the center of rotation of the first concentrator, the first concentrator rotates while the collector tube remains stationary, thus avoiding leakage issues at the collector tube's rotating joint.
[0024] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the structure of the solar collector provided in Embodiment 1 of the present invention;
[0027] Figure 2 This is a schematic diagram of the optical path of the concentrator assembly provided in Embodiment 1 of the present invention;
[0028] Figure 3 This is a schematic diagram of the structure of the solar collector provided in Embodiment 2 of the present invention.
[0029] Among them, 100 is the first concentrator, 101 is the support, 1011 is the column, 1012 is the tracking drive device, 1013 is the mounting hole, 102 is the first reflection component, 1021 is the first bracket, 1022 is the first parabolic reflector, 1023 is the gap, and 103 is the rotation center.
[0030] 200 is the second condenser, 201 is the second parabolic mirror, and 202 is the second support.
[0031] 300 is the third concentrator;
[0032] 400 is the heat collection tube, and 401 is the collar. Detailed Implementation
[0033] The core of this invention is to provide a solar collector to improve the heat collection efficiency of solar collectors.
[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0035] Solar thermal power generation technology uses mirrors and collectors to concentrate sunlight and convert it into heat energy, which is then converted into electricity through a steam Rankine cycle. It is a promising solar energy utilization technology. Commonly used solar collectors include flat-plate collectors, evacuated tube collectors, solar air collectors, and concentrating solar collectors.
[0036] Among them, focusing solar collectors can significantly increase the heat collection temperature compared to other collectors. Focusing solar collectors are mainly divided into two types: point-focusing collectors and line-focusing collectors. Although point-focusing solar collectors can obtain high-temperature heat sources of several hundred or even thousands of degrees Celsius, their cost is relatively high, and such high temperatures are clearly unnecessary in high-temperature solar energy applications, sometimes even causing damage to the absorber. Currently, line-focusing solar collector systems can be further divided into four types according to the type of concentrator: parabolic trough concentrators, line-focusing Fresnel lenses, Fresnel mirrors, and non-imaging concentrators.
[0037] Parabolic trough solar collectors mount the collector tubes on the top of a parabolic trough reflector via a bracket. Sunlight incident on the parabolic reflector is reflected and focused onto the collector tube located at the focal line. Except for a small amount absorbed and reflected by the glass sleeve, most of the sunlight passes through the glass sleeve to the outer wall of the absorber tube, where it is absorbed by the solar selective absorption coating and converted into heat energy. The heat is then conducted and convectioned to the fluid inside the tube.
[0038] Traditional parabolic trough solar collectors suffer from low collection efficiency due to their large concentrated light spot. Using large-diameter collector tubes increases heat loss, while smaller-diameter tubes lead to light leakage and reduced optical efficiency. Furthermore, the collector tubes rotate with the reflector to track the sun, making the rotating joints prone to leakage and posing safety risks. Additionally, molten salt solidification at the joints during venting can cause difficulties. Moreover, the large opening of the parabolic trough results in significant wind loads, requiring heavy supports to withstand the load, thus increasing the collector's unit weight.
[0039] Therefore, such as Figures 1 to 3 As shown, this embodiment of the invention discloses a solar collector, including a concentrator assembly and a collector tube 400. By employing a multi-reflection concentrating method, the first reflector 102 of the first concentrator 100 reflects vertically incident sunlight onto the second concentrator 200, which then focuses the light onto the collector tube 400. Finally, the third concentrator 300 reflects any light overflowing from the collector tube 400 back onto it, achieving high-concentration light and improving the optical and thermal efficiency of the solar collector. Simultaneously, by placing the collector tube 400 at the rotation center 103 of the first concentrator 100, the first concentrator 100 can rotate while the collector tube 400 remains stationary, thus avoiding leakage at the rotating joint of the collector tube 400.
[0040] The following will combine Figures 1 to 3 The solar collector disclosed in the embodiments of the present invention will be explained and described in detail.
[0041] Among them, such as Figure 1 and Figure 3 As shown, the concentrator assembly includes a first concentrator 100, a second concentrator 200, and a third concentrator 300. The first concentrator 100 includes a support member 101 and a first reflective component 102 rotatably mounted on the support member 101. The first reflective component 102 reflects vertically incident sunlight onto the second concentrator 200. Simultaneously, the first reflective component 102 can rotate around the rotation center 103 of the first concentrator 100, effectively tracking the sun's position and ensuring that the first reflective component 102 always faces the sun, thereby maximizing the solar energy collection efficiency. The second concentrator 200 and the third concentrator 300 are respectively connected to the first reflective component 102 to ensure that the second concentrator 200 and the third concentrator 300 can rotate synchronously with the first reflective component 102. It should be noted that the rotation center 103 is the axis center line located on the symmetry center plane of the first condenser 100 and parallel to the focal line of the first condenser 100, and the first reflective component 102 can rotate circumferentially around the axis center line.
[0042] Furthermore, to ensure that the collector tube 400 does not rotate with the first reflector 102, the collector tube 400 is positioned at the rotation center 103 of the first reflector 102, allowing the concentrator assembly to rotate around the collector tube 400. Simultaneously, to ensure that the third concentrator 300 can reflect light overflowing from the collector tube 400 back onto the collector tube 400, the focusing center of the third concentrator 300 is located at the rotation center 103 of the first reflector 102, meaning the focusing center of the third concentrator 300 coincides with the rotation center 103 of the first reflector 102. This allows light incident on the third concentrator 300 to be reflected back onto the collector tube 400, achieving high-concentration light and improving the optical and heat collection efficiency of the solar collector.
[0043] When the solar collector is working, such as Figure 2As shown, the first reflector 102 of the first concentrator 100 reflects vertically incident sunlight onto the second concentrator 200, forming a first incident light on the second concentrator 200. The second concentrator 200 reflects the first incident light onto the collector tube 400 and the third concentrator 300, forming a second incident light on the third concentrator 300. The third concentrator 300 reflects the second incident light back onto the collector tube 400, thus creating a multi-reflection concentrating effect. Through this multi-reflection method, the first concentrator 100 has an extra-large opening, and the second and third concentrators 200 and 300 can highly concentrate the light onto the collector tube 400 located at the center of rotation of the trough collector. This reduces the diameter of the collector tube 400, prevents light leakage, and reduces heat loss. Furthermore, by placing the collector tube 400 at the center of rotation of the first reflector 102, there is no need to install a rotating joint, effectively avoiding the problem of leakage from the rotating joint of the collector tube 400.
[0044] Furthermore, such as Figure 1 and Figure 3 As shown, the first concentrator 100 is a slotted concentrator with an extra-large opening, and the first reflective assembly 102 includes a first support 1021 and at least two first parabolic reflectors 1022 with different focal lengths and confocal lines mounted on the first support 1021. In this embodiment, two first parabolic reflectors 1022 with different focal lengths and confocal lines are used. By adjusting the distance between the two first parabolic reflectors 1022 with different focal lengths, the two first parabolic reflectors 1022 with different focal lengths achieve the purpose of confocal lines, thereby ensuring that sunlight perpendicularly incident on the first parabolic reflectors 1022 can be reflected onto the second concentrator 200. At the same time, by adjusting the distance between the two first parabolic reflectors 1022 with different focal lengths, a gap 1023 that allows wind to pass through can be formed between two adjacent first parabolic reflectors 1022, thereby reducing effective wind resistance, reducing the wind load applied to the first parabolic reflectors 1022, and improving the service life of the solar collector.
[0045] Specifically, for ease of understanding, the two parabolic reflectors 1022 with different focal lengths are defined as the first reflector and the second reflector, respectively. The parabolic reflector 1022 closer to the heat collection tube 400 is defined as the first reflector, and the parabolic reflector 1022 farther from the heat collection tube 400 is defined as the second reflector. The support member 101 includes columns 1011 located at both ends of the first support 1021 and a tracking drive device 1012 mounted on the columns 1011. The first support 1021 adopts a truss structure system symmetrically distributed on both sides of the heat collection tube 400, and the first support 1021 includes multiple single trusses distributed along the axial direction of the heat collection tube 400, and each single truss can be connected by multiple connecting rods. Simultaneously, there are two first reflectors and two second reflectors, each symmetrically fixed to the connecting rod of the first bracket 1021 about respect to the heat collection tube 400. That is, there is one first reflector and one second reflector distributed on each side of the heat collection tube 400. Space is left between adjacent first reflectors for installing the heat collection tube 400, allowing it to be installed at the rotation center between adjacent first reflectors. This ensures that the second concentrator 200 reflects the first incident light onto the third concentrator 300, forming a second incident light on the third concentrator 300. The third concentrator 300 then reflects the second incident light back onto the heat collection tube 400, creating a multi-reflection concentrating effect. By connecting the connecting rod of the first bracket 1021 to the tracking drive device 1012, the tracking drive device 1012 drives the first bracket 1021 to rotate, thereby rotating the first parabolic reflector 1022.
[0046] It should be noted that the cross-section of the first parabolic reflector 1022 is a convex parabola, i.e. a convex mirror. The first and second reflectors can be a separate structure along the axial direction of the heat collection tube 400 or an integrated structure. This paper does not impose any restrictions on this.
[0047] Furthermore, such as Figure 1 and Figure 3As shown, to prevent the heat collector tube 400 from rotating synchronously with the first reflector assembly 102, a mounting hole 1013 for mounting the heat collector tube 400 can be provided on the tracking drive device 1012, and a collar 401 that slides through the mounting hole 1013 can be provided on the heat collector tube 400. Specifically, the tracking drive device 1012 includes a bearing component, a bearing seat for mounting the bearing component, and a drive component for driving the bearing component to rotate. The bearing component is provided with a mounting hole 1013 for mounting the heat collector tube 400 and a bearing hole sleeved on the connecting rod of the first bracket 1021. The bearing component is fixed to the top of the column 1011 by the bearing seat. When the driving component drives the bearing component to rotate, the bearing component drives the first bracket 1021 to rotate. Because the collar 401 on the heat collection tube 400 slides in conjunction with the mounting hole 1013 on the bearing component, the bearing component can rotate around the heat collection tube 400 in the mounting hole 1013. This prevents the heat collection tube 400 from rotating synchronously with the first reflective assembly 102, effectively avoiding leakage from the rotary joint of the heat collection tube 400. Simultaneously, the heat collection tube 400 includes a metal tube and an insulation layer located outside the metal tube. The inner cavity of the metal tube is filled with a heat transfer medium. To ensure smooth discharge of the heat transfer medium within the heat collection tube 400, the height of the bearing seats at both ends of the heat collection tube 400 can be adjusted, allowing one end of the heat collection tube 400 to be tilted towards the other, so that the heat transfer medium can be smoothly discharged along the heat collection tube 400 under its own gravity.
[0048] It should be noted that the driving component of the tracking drive device 1012 can be, but is not limited to, a servo motor or a hydraulic cylinder. Furthermore, to enable the tracking drive device 1012 to track and capture sunlight, a photosensor can be installed on it. Through the cooperation of the photosensor and the driving component, the first reflective component 102 can always face the sun, effectively tracking the sun's position and maximizing solar energy collection efficiency. Of course, the tracking drive device 1012 can also employ a conventional drive mechanism capable of tracking the sun's position and simultaneously driving the first reflective component 102 to rotate; this will not be elaborated upon further here.
[0049] Furthermore, the second concentrator 200 includes a second parabolic reflector 201 and a second bracket 202 for mounting the second parabolic reflector 201, the second bracket 202 being connected to the first bracket 1021. Specifically, the second parabolic reflector 201 is an integral structure along the axial direction of the collector tube 400, and the second parabolic reflector 201 is supported by the second brackets 202 located at both ends of the second parabolic reflector 201, so that the second parabolic reflector 201 is fixed above the collector tube 400, thereby enabling the second parabolic reflector 201 to reflect the first incident light reflected from the first reflective component 102 of the first concentrator 100 back onto the collector tube 400 and the third concentrator 300. The second bracket 202 can adopt a truss structure system, which can effectively reduce the weight of the second bracket 202 while ensuring the strength of supporting the second parabolic reflector 201, thus saving the cost of the entire solar collector. To ensure that the first reflective component 102 of the first concentrator 100 reflects the vertically incident sunlight onto the second concentrator 200 to form the first incident light on the second concentrator 200, and that the second concentrator 200 reflects the first incident light onto the heat collection tube 400 and the third concentrator 300, the focal line of the second concentrator 200 must be the same as the focal line of the first concentrator 100, that is, the focal line of the second concentrator 200 coincides with the focal line of the first concentrator 100. Figure 1 and Figure 3 As shown.
[0050] Furthermore, the third concentrator 300 can be mounted on the first bracket 1021, and the third concentrator 300 is located below the heat collection tube 400, such as... Figure 2 As shown, this design ensures that the light overflowing from the heat collection tube 400 can be reflected back onto the heat collection tube 400 by the third concentrator 300, thereby achieving high-concentration light and improving the optical and heat collection efficiency of the solar collector. The cross-section of the third concentrator 300 includes at least one of a parabola, an involute, or a circular arc, and the concentrating center of the third concentrator 300 is located at the rotation center of the first reflective component 102, i.e., at the location of the heat collection tube 400. In this embodiment, the third concentrator 300 can be a composite parabolic CPC concentrator, which can distribute the incident sunlight more evenly onto the heat collection tube 400, thereby ensuring the uniformity of heat conduction in the heat collection tube 400. It should be noted that a composite parabolic CPC concentrator refers to using two symmetrical parabolic surfaces that share a focal point to ensure that light incident from any direction can be effectively focused.
[0051] like Figure 1As shown, in one specific embodiment, the opening width of the first concentrator 100 is 14 mm. The heat collection tube 400 includes a metal tube and an insulation layer located on the outside of the metal tube. The insulation layer of the heat collection tube 400 can be a transparent aerogel wrapped around the outer wall of the metal tube. The metal tube is filled with a heat transfer medium, and the outer diameter of the metal tube is 90 mm. Meanwhile, the cross-section of the second concentrator 200 is a convex parabola, that is, the second parabolic reflector 201 is a convex lens. At this time, the second concentrator 200 and the first concentrator 100 are located on the same side of the focal line, that is, the second parabolic reflector 201 and the first reflective assembly 102 are located on the lower side of the focal line. Figure 1 (View angle). Furthermore, the third concentrator 300 employs a composite parabolic CPC concentrator composed of a parabola and an involute. By using the multiple focusing and reflection method described in the above embodiment, the highest focusing ratio can reach 155, thereby achieving a high-concentration effect.
[0052] Of course, the second condenser 200 and the first condenser 100 can also be located on opposite sides of the focal line, i.e., different sides, such as... Figure 3 As shown, in another specific embodiment, the opening width of the first concentrator 100 can be 20 mm, and the heat collection tube 400 is a vacuum heat collection tube, that is, the heat collection tube 400 includes a metal tube and an insulation layer located outside the metal tube, a vacuum zone is set between the insulation layer and the metal tube, and the metal tube is filled with a heat transfer medium. In this embodiment, the insulation layer can be a glass sleeve sleeved outside the metal tube, and air is extracted between the glass sleeve and the metal tube by an air extraction device, thereby forming a vacuum zone between the glass sleeve and the metal tube, and the outer diameter of the metal tube is 100 mm. Furthermore, in this embodiment, as... Figure 3 As shown, the cross-section of the second condenser 200 is a concave parabola, meaning the second parabolic mirror 201 is a concave lens. In this case, the second condenser 200 and the first condenser 100 are located on opposite sides of the focal line, i.e., the second parabolic mirror 201 is located above the focal line, and the first reflecting assembly 102 is located below the focal line. Figure 3 (View angle). Furthermore, the third concentrator 300 employs a composite parabolic CPC concentrator composed of involutes and arcs. By using the multiple focusing and reflection method described in the above embodiment, the highest focusing ratio can reach 200, thereby achieving a high-magnification focusing effect.
[0053] It should be noted that the heat transfer medium in the above embodiments can be, but is not limited to, molten salt, or can also be heat transfer oil or a mixture of water and ethylene glycol, etc.
[0054] The terms "first" and "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed.
[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A solar collector, characterized in that, include: A concentrator assembly, comprising a first concentrator (100), a second concentrator (200), and a third concentrator (300), wherein the first concentrator (100) includes a support member (101) and a first reflective component (102) rotatably disposed on the support member (101), the first reflective component (102) rotating around the rotation center (103) of the first concentrator (100), the second concentrator (200) and the third concentrator (300) being respectively connected to the first reflective component (102), and the focusing center of the third concentrator (300) coinciding with the rotation center (103) of the first reflective component (102); A heat collection tube (400) is disposed at the rotation center (103) of the first reflective component (102); The first reflective component (102) is used to reflect vertically incident sunlight onto the second concentrator (200) to form a first incident light on the second concentrator (200). The second concentrator (200) is used to reflect the first incident light onto the heat collection tube (400) and the third concentrator (300) to form a second incident light on the third concentrator (300). The third concentrator (300) is used to reflect the second incident light onto the heat collection tube (400).
2. The solar collector according to claim 1, characterized in that, The first reflective assembly (102) includes a first bracket (1021) and at least two first parabolic mirrors (1022) with different focal lengths and confocal lines mounted on the first bracket (1021), and there is a gap (1023) between two adjacent first parabolic mirrors (1022) for wind to pass through.
3. The solar collector according to claim 2, characterized in that, The support member (101) includes a column (1011) and a tracking drive device (1012) disposed on the column (1011). The tracking drive device (1012) is used to connect with the first bracket (1021) to drive the first reflective component (102) to rotate around the rotation center (103).
4. The solar collector according to claim 3, characterized in that, The second concentrator (200) includes a second parabolic mirror (201) and a second bracket (202) for mounting the second parabolic mirror (201), the second bracket (202) being connected to the first bracket (1021).
5. The solar collector according to claim 3, characterized in that, The tracking drive device (1012) is provided with a mounting hole (1013) for mounting the heat collection tube (400), and the heat collection tube (400) is provided with a collar (401) that slides with the mounting hole (1013), and one end of the heat collection tube (400) is inclined to the other end.
6. The solar collector according to claim 5, characterized in that, The heat collection tube (400) includes a metal tube and an insulation layer located outside the metal tube, and the inner cavity of the metal tube is filled with a heat transfer medium.
7. The solar collector according to claim 6, characterized in that, The insulation layer is a transparent aerogel wrapped around the outer wall of the metal tube; or, The insulation layer is a glass sleeve fitted over the outside of the metal tube, and a vacuum zone is provided between the glass sleeve and the metal tube.
8. The solar collector according to claim 1, characterized in that, The cross-section of the second condenser (200) is a convex parabola, and the focal line of the second condenser (200) is the same as that of the first condenser (100). The second condenser (200) and the first condenser (100) are located on the same side of the focal line, respectively.
9. The solar collector according to claim 1, characterized in that, The cross-section of the second condenser (200) is a concave parabola. The focal line of the second condenser (200) is the same as that of the first condenser (100). The second condenser (200) and the first condenser (100) are located on opposite sides of the focal line.
10. The solar collector according to any one of claims 1 to 9, characterized in that, The cross-section of the third concentrator (300) includes at least one of a parabola, an involute, or a circular arc.