Solar heat collector

Abstract

The utility model discloses a solar heat collector, which relates to the technical field of solar thermal power generation and comprises a condenser component and a heat collecting tube. The condenser assembly comprises a first condenser, a second condenser and a third condenser, the first condenser comprises a supporting piece and a first reflection assembly rotationally arranged on the supporting piece, the first reflection assembly rotates around the rotating center of the first condenser, and the second condenser and the third condenser are connected with the first reflection assembly. The condensation center of the third condenser coincides with the rotation center of the first reflection assembly. The heat collecting pipe is arranged at the rotating center position of the first reflection assembly. According to the solar heat collector provided by the invention, high-power light condensation is realized by adopting a multi-reflection light condensation mode, and the optical efficiency and the heat collection efficiency of the solar heat collector are improved. Meanwhile, the heat collecting pipe is placed at the rotating center position of the first condenser, the effect that the heat collecting pipe does not rotate can be achieved, and therefore the problem of liquid leakage of a rotating connector of the heat collecting pipe is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar thermal power generation, and more specifically, to a solar thermal collector. Background Art

[0002] Parabolic trough solar collector installs the collector tube on the upper part of the trough parabolic reflector through a bracket. The solar rays incident on the parabolic reflector are reflected and focused on the collector tube at the focal line. Except for a small amount absorbed and reflected by the glass sleeve, most of the solar rays pass through the glass sleeve to reach the outer wall of the heat absorbing tube, and are then absorbed by the solar selective absorption coating and converted into heat energy, which is then transferred to the fluid in the tube through heat conduction and convection.

[0003] Traditional parabolic trough solar collectors have a large focusing spot. If large-diameter collector tubes are used, heat loss will increase. If smaller-diameter collector tubes are used, light overflow will occur, resulting in reduced optical efficiency, thereby making the solar collector's thermal efficiency lower.

[0004] In addition, since the collector tube needs to rotate with the reflector when it tracks the sun, the rotating joint connected to it is prone to leakage, which poses a safety risk. When the molten salt is emptied, the molten salt is prone to solidification at the rotating joint, making it difficult to empty. At the same time, the parabolic trough solar collector has a large wind load due to its large opening, and a heavier bracket is required to ensure its force, resulting in a larger unit weight of the collector.

[0005] Therefore, how to improve the heat collection efficiency of solar thermal collectors has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0006] In view of this, an object of the present invention is to provide a solar thermal collector to improve the heat collection efficiency of the solar thermal collector.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A solar thermal collector comprising:

[0009] A concentrator assembly, the concentrator assembly comprising a first concentrator, a second concentrator and a third concentrator, the first concentrator comprising a support and a first reflective assembly rotatably disposed on the support, the first reflective assembly rotates around a rotation center of the first concentrator, the second concentrator and the third concentrator are respectively connected to the first reflective assembly, and a focusing center of the third concentrator coincides with a rotation center of the first reflective assembly;

[0010] A heat collecting tube, arranged at the rotation center of the first reflecting assembly;

[0011] Among them, the first reflecting component is used to reflect vertically incident sunlight to the second concentrator to form a first incident light on the second concentrator, the second concentrator is used to reflect the first incident light to the thermal collecting tube and the third concentrator to form a second incident light on the third concentrator, and the third concentrator is used to reflect the second incident light to the thermal collecting tube.

[0012] Optionally, in the above-mentioned solar thermal collector, the first reflecting assembly includes a first bracket and at least two first parabolic reflectors with different focal lengths and common focal lines mounted on the first bracket, and a gap for wind to pass through is provided between two adjacent first parabolic reflectors.

[0013] Optionally, in the above-mentioned solar thermal collector, the support member includes a column and a tracking drive device arranged on the column, and the tracking drive device is used to connect with the first bracket to drive the first reflection component to rotate around the rotation center.

[0014] Optionally, in the above solar thermal collector, the second concentrator includes a second parabolic reflector and a second bracket for mounting the second parabolic reflector, and the second bracket is connected to the first bracket.

[0015] Optionally, in the above-mentioned solar collector, the tracking drive device is provided with a mounting hole for mounting the heat collecting tube, the heat collecting tube is provided with a ring that slides with the mounting hole, and one end of the heat collecting tube is inclined toward the other end.

[0016] Optionally, in the above-mentioned solar thermal collector, the heat collecting tube includes a metal tube and a thermal 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 solar thermal collector, the thermal insulation layer is a transparent aerogel wrapped on the outer wall of the metal tube; or,

[0018] The heat-insulating layer is a glass sleeve sleeved on 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 solar thermal collector, the cross section of the second concentrator is a convex parabola, and the focal line of the second concentrator is the same as the focal line of the first concentrator, and the second concentrator and the first concentrator are respectively located on the same side of the focal line.

[0020] Optionally, in the above solar thermal collector, the cross section of the second concentrator is a concave parabola, the focal line of the second concentrator is the same as the focal line of the first concentrator, and the second concentrator and the first concentrator are located on different sides of the focal line.

[0021] Optionally, in the above solar thermal collector, the cross-section of the third concentrator includes at least one of a parabola, an involute or a circular arc.

[0022] The solar thermal collector provided by the utility model is provided with a first concentrator, a second concentrator and a third concentrator, and the first reflective assembly of the first concentrator is rotatably provided on a support member, so that the first reflective assembly can rotate around the rotation center of the first concentrator, and the second concentrator and the third concentrator are respectively connected to the first reflective assembly, and the focusing center of the third concentrator coincides with the rotation center of the first reflective assembly, and the heat collection tube is provided at the rotation center position of the first reflective assembly. The first reflective assembly of the first concentrator reflects vertically incident sunlight onto the second concentrator to form the first incident light on the second concentrator, the second concentrator reflects the first incident light onto the heat collection tube and the third concentrator to form the second incident light on the third concentrator, and the third concentrator reflects the second incident light onto the heat collection tube, thereby forming a multiple reflection and focusing effect.

[0023] Compared with the prior art, the solar collector provided by the utility model adopts a multiple reflection and focusing method, using the first reflection component of the first concentrator to reflect the vertically incident sunlight to the second concentrator, and the second concentrator focuses the light onto the heat collecting tube, and the third concentrator reflects the light overflowing the heat collecting tube back to the heat collecting tube, thereby achieving high-power focusing and improving the optical efficiency and heat collection efficiency of the solar collector. At the same time, by placing the heat collecting tube at the rotation center position of the first concentrator, the effect of the first concentrator rotating while the heat collecting tube does not rotate can be achieved, thereby avoiding the problem of liquid leakage from the rotating joint of the heat collecting tube.

[0024] The technical features mentioned above, the technical features to be mentioned below, and the technical features shown separately in the drawings can be combined with each other arbitrarily, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents clearly recorded in this article. Any of the multiple sub-features contained in the same sentence can be applied independently, and does not have to be applied together with other sub-features. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of the structure of a solar thermal collector provided in Embodiment 1 of the present utility model;

[0027] Figure 2 A schematic diagram of the optical path of the condenser assembly provided in the first embodiment of the utility model;

[0028] Figure 3 This is a schematic structural diagram of a solar thermal collector provided in Embodiment 2 of the present utility model.

[0029] Wherein, 100 is a first concentrator, 101 is a support, 1011 is a column, 1012 is a tracking drive device, 1013 is a mounting hole, 102 is a first reflection assembly, 1021 is a first bracket, 1022 is a first parabolic reflector, 1023 is a gap, and 103 is a rotation center;

[0030] 200 is a second concentrator, 201 is a second parabolic reflector, and 202 is a second bracket;

[0031] 300 is a third concentrator;

[0032] 400 is a heat collecting tube, and 401 is a sleeve ring. DETAILED DESCRIPTION

[0033] The core of the utility model is to provide a solar thermal collector to improve the heat collection efficiency of the solar thermal collector.

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Solar thermal power generation technology is a promising solar energy utilization technology that uses mirrors and collectors to convert sunlight into heat energy, and then converts heat energy into electrical energy through the steam Rankine cycle. Commonly used solar collectors include flat plate collectors, vacuum tube collectors, solar air collectors, and focusing solar collectors.

[0036] Among them, focusing solar collectors can significantly increase the collection temperature compared with 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 hundreds or even thousands of degrees, the cost and cost are relatively high, and such high temperatures are obviously not required in the field of medium and high temperature utilization of solar energy, and sometimes even cause damage to the absorber. At present, line focusing solar collector systems can be divided into four types according to the type of concentrator: trough parabolic, line focusing Fresnel lens, Fresnel reflector and non-imaging concentrator.

[0037] The parabolic trough solar collector is a system in which the heat collecting tube is installed on the upper part of the trough parabolic reflector through a bracket. The solar rays incident on the parabolic reflector are reflected and converged onto the heat collecting tube at the focal line. Except for a small amount absorbed and reflected by the glass sleeve, most of the solar rays pass through the glass sleeve to reach the outer wall of the heat absorbing tube, and are then absorbed by the solar selective absorption coating and converted into heat energy, which is then transferred to the fluid in the tube through heat conduction and convection.

[0038] Traditional parabolic trough solar collectors have a large focusing spot. If a large diameter collector tube is used, the heat loss will increase. If a smaller diameter collector tube is used, there will be a light overflow problem, resulting in reduced optical efficiency, which makes the solar collector's heat collection efficiency low. In addition, since the collector tube needs to rotate with the reflector when the reflector tracks the sun, the rotating joint connected to it is prone to leakage, which poses a safety risk. When the molten salt is emptied, the molten salt is prone to solidification at the rotating joint, making it difficult to empty. At the same time, due to the large opening, the parabolic trough solar collector has a large wind load problem, and a heavier bracket is required to ensure its force, resulting in a large unit weight of the collector.

[0039] For this reason, Figures 1 to 3 As shown, the embodiment of the utility model discloses a solar collector, including a concentrator assembly and a heat collecting tube 400. By adopting a multiple reflection focusing method, the first reflection assembly 102 of the first concentrator 100 is used to reflect the vertically incident sunlight to the second concentrator 200, and the light is focused on the heat collecting tube 400 by the second concentrator 200, and the light overflowing the heat collecting tube 400 is reflected again to the heat collecting tube 400 by the third concentrator 300, so as to achieve high-power concentration and improve the optical efficiency and heat collection efficiency of the solar collector. At the same time, by placing the heat collecting tube 400 at the rotation center 103 of the first concentrator 100, the effect of the first concentrator 100 rotating while the heat collecting tube 400 does not rotate can be achieved, thereby avoiding the problem of liquid leakage of the rotating joint of the heat collecting tube 400.

[0040] The following will be combined Figures 1 to 3The solar thermal collector disclosed in the embodiment of the utility model is specifically explained and illustrated.

[0041] Among them, Figure 1 and Figure 3 As shown, the concentrator assembly includes a first concentrator 100, a second concentrator 200 and a third concentrator 300, and the first concentrator 100 includes a support 101 and a first reflective assembly 102 rotatably disposed on the support 101. The first reflective assembly 102 can reflect vertically incident sunlight to the second concentrator 200, and the first reflective assembly 102 can rotate around the rotation center 103 of the first concentrator 100, which can effectively track the position of the sun and ensure that the first reflective assembly 102 always faces the sun, thereby maximizing the collection efficiency of solar energy. The second concentrator 200 and the third concentrator 300 are respectively connected to the first reflective assembly 102 to ensure that the second concentrator 200 and the third concentrator 300 can rotate synchronously with the first reflective assembly 102. It should be noted that the rotation center 103 is an axial center line located on the symmetry center plane of the first concentrator 100 and parallel to the focal line of the first concentrator 100 , and the first reflective component 102 can rotate circumferentially around the axial center line.

[0042] In addition, in order to ensure that the heat collecting pipe 400 does not rotate with the first reflecting assembly 102, the heat collecting pipe 400 is arranged at the position of the rotation center 103 of the first reflecting assembly 102, so that the concentrator assembly can rotate around the heat collecting pipe 400. At the same time, in order to ensure that the third concentrator 300 can reflect the light overflowing the heat collecting pipe 400 to the heat collecting pipe 400 again, the focusing center of the third concentrator 300 is located on the rotation center 103 of the first reflecting assembly 102, that is, the focusing center of the third concentrator 300 coincides with the rotation center 103 of the first reflecting assembly 102, so that the light incident on the third concentrator 300 can be reflected to the heat collecting pipe 400 again, achieving high-power focusing and improving the optical efficiency and heat collection efficiency of the solar collector.

[0043] When the solar collector is working, Figure 2As shown, the first reflective assembly 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, the second concentrator 200 reflects the first incident light onto the heat collecting tube 400 and the third concentrator 300 to form the second incident light on the third concentrator 300, and the third concentrator 300 reflects the second incident light onto the heat collecting tube 400, thereby forming a multiple reflection focusing effect. Through multiple reflections, the first concentrator 100 adopts an ultra-large opening, and the second concentrator 200 and the third concentrator 300 realize high-power focusing of the light onto the heat collecting tube 400 located at the rotation center of the trough collector, thereby reducing the diameter of the heat collecting tube 400, avoiding light leakage, and reducing heat loss. At the same time, by arranging the heat collecting tube 400 at the rotation center of the first reflective assembly 102, there is no need to install a rotary joint, which can effectively avoid the problem of liquid leakage of the rotary joint of the heat collecting tube 400.

[0044] Furthermore, if Figure 1 and Figure 3 As shown, the first concentrator 100 adopts a trough concentrator with an ultra-large opening, and the first reflection assembly 102 includes a first bracket 1021 and at least two first parabolic reflectors 1022 with different focal lengths and a common focal line installed on the first bracket 1021. In this embodiment, two first parabolic reflectors 1022 with different focal lengths and a common focal line are used, and the spacing between the two first parabolic reflectors 1022 with different focal lengths is adjusted so that the two first parabolic reflectors 1022 with different focal lengths can achieve the purpose of a common focal line, thereby ensuring that the sunlight vertically incident on the first parabolic reflector 1022 can be reflected onto the second concentrator 200, and at the same time, by adjusting the spacing 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 the effective wind resistance, reducing the wind load applied to the first parabolic reflector 1022, and improving the service life of the solar collector.

[0045] Specifically, for ease of understanding, two first parabolic reflectors 1022 with different focal lengths are defined as first reflectors and second reflectors, respectively, and the first parabolic reflector 1022 closer to the heat collecting tube 400 is defined as the first reflector, and the first parabolic reflector 1022 farther from the heat collecting tube 400 is defined as the second reflector. The support member 101 includes columns 1011 located at both ends of the first bracket 1021 and a tracking drive device 1012 disposed on the columns 1011. The first bracket 1021 adopts a truss structure system symmetrically distributed on both sides of the heat collecting tube 400, and the first bracket 1021 includes a plurality of single trusses distributed along the axial direction of the heat collecting tube 400, and each single truss can be connected by a plurality of connecting rods. At the same time, there are two first reflectors and two second reflectors, and each of the first reflectors and the second reflectors is symmetrically fixed on the connecting rod of the first bracket 1021 with respect to the heat collecting tube 400, that is, a first reflector and a second reflector are distributed on each side of the heat collecting tube 400, and a space for installing the heat collecting tube 400 is reserved between adjacent first reflectors, so that the heat collecting tube 400 can be installed at the rotation center position between adjacent first reflectors, and at the same time, it can be ensured that the second concentrator 200 reflects the first incident light to the third concentrator 300 to form the second incident light on the third concentrator 300, and the third concentrator 300 reflects the second incident light to the heat collecting tube 400, thereby forming a multiple reflection and focusing effect. By connecting the connecting rod of the first bracket 1021 with the tracking drive device 1012, the purpose of driving the first bracket 1021 to rotate by the tracking drive device 1012 is achieved to drive the first parabolic reflector 1022 to rotate.

[0046] It should be noted that the cross-section of the first parabolic reflector 1022 is a convex parabola, that is, a convex mirror, and the first reflector and the second reflector can adopt a split structure along the axial direction of the heat collecting tube 400, or an integrated structure, which is not limited in this article.

[0047] Furthermore, if Figure 1 and Figure 3As shown, in order to realize that the heat collecting pipe 400 does not rotate synchronously with the first reflective assembly 102, a mounting hole 1013 for mounting the heat collecting pipe 400 can be provided on the tracking driving device 1012, and a collar 401 that is slidably matched with the mounting hole 1013 can be provided on the heat collecting pipe 400. Specifically, the tracking driving device 1012 includes a bearing member, a bearing seat for mounting the bearing member, and a driving member for driving the bearing member to rotate, and the bearing member is respectively provided with a mounting hole 1013 for mounting the heat collecting pipe 400 and a bearing hole on the connecting rod sleeved on the first bracket 1021. The bearing member is fixed to the top of the column 1011 through the bearing seat. When the driving member drives the bearing member to rotate, the bearing member drives the first bracket 1021 to rotate, and because the sleeve ring 401 on the heat collecting tube 400 is slidably matched with the mounting hole 1013 on the bearing member, the bearing member can rotate around the heat collecting tube 400 on the mounting hole 1013, thereby achieving the purpose of the heat collecting tube 400 not rotating synchronously with the first reflective component 102, and effectively avoiding the problem of liquid leakage of the rotary joint of the heat collecting tube 400. At the same time, the heat collecting 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. In order to ensure smooth discharge of the heat transfer medium in the heat collecting tube 400, the height of the bearing seats at both ends of the heat collecting tube 400 can be adjusted, so that one end of the heat collecting tube 400 is tilted toward the other end, so that the heat transfer medium can be discharged smoothly along the heat collecting tube 400 under the action of its own gravity.

[0048] It should be noted that the driving member of the tracking driving device 1012 may be, but is not limited to, a servo motor or a hydraulic cylinder. At the same time, in order to enable the tracking driving device 1012 to track and capture sunlight, a photosensitive sensor may be provided on the tracking driving device 1012, so that the first reflective component 102 always faces the sun through the cooperation of the photosensitive sensor and the driving member, and the position of the sun can be effectively tracked, so that the solar energy collection efficiency is maximized. Of course, the tracking driving device 1012 may also adopt a conventional driving mechanism that can track the position of sunlight and drive the first reflective component 102 to rotate at the same time, which will not be described in detail herein.

[0049] Further, the second concentrator 200 includes a second parabolic reflector 201 and a second bracket 202 for mounting the second parabolic reflector 201, and the second bracket 202 is connected to the first bracket 1021. Specifically, the second parabolic reflector 201 is an integrated structure along the axial direction of the heat collecting 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 heat collecting tube 400, so that the second parabolic reflector 201 can reflect the first incident light reflected by the first reflection component 102 of the first concentrator 100 again to the heat collecting tube 400 and the third concentrator 300. The second bracket 202 can adopt a truss structure system, so as to ensure the strength of supporting the second parabolic reflector 201, and effectively reduce the weight of the second bracket 202, saving the cost of the entire solar collector. In order to ensure that the first reflective assembly 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 the second concentrator 200 reflects the first incident light onto the heat collecting tube 400 and the third concentrator 300, the focal line of the second concentrator 200 needs to 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, such as Figure 1 and Figure 3 shown.

[0050] Furthermore, the third concentrator 300 can be disposed on the first bracket 1021, and the third concentrator 300 is located below the heat collecting tube 400, such as Figure 2 As shown, it is ensured that the light overflowing the heat collecting tube 400 can be reflected back to the heat collecting tube 400 by the third concentrator 300, thereby achieving high-power concentration and improving the optical efficiency and heat collection efficiency of the solar collector. Among them, the cross section of the third concentrator 300 includes at least one of a parabola, an involute or a circular arc, and ensures that the focusing center of the third concentrator 300 is located at the rotation center of the first reflection component 102, that is, the focusing center of the third concentrator 300 is located at the position of the heat collecting tube 400. In this embodiment, the third concentrator 300 can adopt a compound parabolic CPC concentrator, which can distribute the incident sunlight more evenly to the heat collecting tube 400, thereby ensuring the uniformity of heat conduction of the heat collecting tube 400. It should be noted that the compound parabolic CPC concentrator refers to two symmetrical parabolic surfaces that share a focus to ensure that light incident from any direction can eventually be effectively focused.

[0051] like Figure 1As shown, in a specific embodiment, the opening width of the first concentrator 100 is 14m, the heat collecting tube 400 includes a metal tube and an insulation layer located outside the metal tube, the insulation layer of the heat collecting tube 400 can be a transparent aerogel wrapped on 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 90mm. At the same time, the cross section of the second concentrator 200 is a convex parabola, that is, the second parabolic reflector 201 adopts a convex lens. At this time, the second concentrator 200 and the first concentrator 100 are respectively located on the same side of the focal line, that is, the second parabolic reflector 201 and the first reflective assembly 102 are respectively located on the lower side of the focal line ( Figure 1 The third concentrator 300 adopts a compound parabolic CPC concentrator composed of a parabola and an involute. By adopting the multiple focusing reflection method in the above embodiment, the highest focusing ratio can reach 155, thereby achieving a high-power focusing effect.

[0052] Of course, the second concentrator 200 and the first concentrator 100 may also be located on different sides of the focal line, that is, on different sides. Figure 3 As shown, in another specific embodiment, the opening width of the first concentrator 100 can be 20m, and the heat collecting tube 400 is a vacuum heat collecting tube, that is, the heat collecting tube 400 includes a metal tube and a thermal insulation layer located on the outside of the metal tube, a vacuum zone is provided between the thermal insulation layer and the metal tube, and the metal tube is filled with a heat transfer medium. In this embodiment, the thermal insulation layer can be a glass sleeve sleeved on the outside of the metal tube, and the air is extracted between the glass sleeve and the metal tube by an exhaust device, thereby forming a vacuum zone between the glass sleeve and the metal tube, and the outer diameter of the metal tube is 100mm. In addition, in this embodiment, as Figure 3 As shown, the cross section of the second concentrator 200 is a concave parabola, that is, the second parabolic reflector 201 adopts a concave lens. At this time, the second concentrator 200 and the first concentrator 100 are located on the opposite sides of the focal line, that is, the second parabolic reflector 201 is located on the upper side of the focal line, and the first reflective component 102 is located on the lower side of the focal line ( Figure 3 The third concentrator 300 is a compound parabolic CPC concentrator composed of an involute and a circular arc. By adopting the multiple focusing reflection method in the above embodiment, the highest focusing ratio can reach 200, thereby achieving a high-power focusing effect.

[0053] It should be noted that the heat transfer medium in the above embodiments may be, but is not limited to, molten salt, and may also be heat transfer oil or a mixture of water and ethylene glycol.

[0054] The terms "first" and "second" in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0055] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A solar thermal collector, characterized in that: include: A concentrator assembly, the concentrator assembly comprising a first concentrator (100), a second concentrator (200) and a third concentrator (300), the first concentrator (100) comprising a support (101) and a first reflective assembly (102) rotatably arranged on the support (101), the first reflective assembly (102) rotating around a rotation center (103) of the first concentrator (100), the second concentrator (200) and the third concentrator (300) being respectively connected to the first reflective assembly (102), and the focusing center of the third concentrator (300) coincides with the rotation center (103) of the first reflective assembly (102); A heat collecting tube (400) is arranged at the rotation center (103) of the first reflecting assembly (102); The first reflecting component (102) is used to reflect vertically incident sunlight onto the second concentrator (200) to form first incident light on the second concentrator (200); the second concentrator (200) is used to reflect the first incident light onto the heat collecting tube (400) and the third concentrator (300) to form second incident light on the third concentrator (300); and the third concentrator (300) is used to reflect the second incident light onto the heat collecting tube (400).

2. The solar thermal collector according to claim 1, characterized in that: The first reflection component (102) comprises a first bracket (1021) and at least two first parabolic reflectors (1022) with different focal lengths and common focal lines mounted on the first bracket (1021), and a gap (1023) for wind to pass through is provided between two adjacent first parabolic reflectors (1022).

3. The solar thermal collector according to claim 2, characterized in that: The support member (101) comprises a column (1011) and a tracking drive device (1012) arranged on the column (1011), wherein the tracking drive device (1012) is used to connect with the first bracket (1021) to drive the first reflection component (102) to rotate around the rotation center (103).

4. The solar thermal collector according to claim 3, characterized in that: The second concentrator (200) comprises a second parabolic reflector (201) and a second bracket (202) for mounting the second parabolic reflector (201), wherein the second bracket (202) is connected to the first bracket (1021).

5. The solar thermal collector according to claim 3, characterized in that: The tracking drive device (1012) is provided with a mounting hole (1013) for mounting the heat collecting tube (400), the heat collecting tube (400) is provided with a collar (401) that slidably fits with the mounting hole (1013), and one end of the heat collecting tube (400) is inclined toward the other end.

6. The solar thermal collector according to claim 5, characterized in that: The heat collecting tube (400) comprises a metal tube and a heat-insulating layer located outside the metal tube, and the inner cavity of the metal tube is filled with a heat transfer medium.

7. The solar thermal collector according to claim 6, characterized in that: The thermal insulation layer is a transparent aerogel wrapped on the outer wall of the metal tube; or, The heat-insulating layer is a glass sleeve sleeved on the outside of the metal tube, and a vacuum zone is provided between the glass sleeve and the metal tube.

8. The solar thermal collector according to claim 1, characterized in that: The cross section of the second concentrator (200) is a convex parabola, the focal line of the second concentrator (200) is the same as the focal line of the first concentrator (100), and the second concentrator (200) and the first concentrator (100) are respectively located on the same side of the focal line.

9. The solar thermal collector according to claim 1, characterized in that: The cross section of the second concentrator (200) is a concave parabola, the focal line of the second concentrator (200) is the same as the focal line of the first concentrator (100), and the second concentrator (200) and the first concentrator (100) are located on different sides of the focal line.

10. The solar thermal collector according to any one of claims 1 to 9, characterized in that: The cross section of the third concentrator (300) comprises at least one of a parabola, an involute or a circular arc.

Images