Solar collector

Abstract

The present invention relates to the technical field of solar thermal power generation. Disclosed is a solar collector, comprising a concentrator assembly and an absorber tube. The concentrator assembly comprises a first concentrator, a second concentrator, and a third concentrator, the first concentrator comprises a support member and a first reflection assembly rotatably arranged on the support member, the first reflection assembly rotates around the rotation center of the first concentrator, the second concentrator and the third concentrator each are connected to the first reflection assembly, and the concentration center of the third concentrator coincides with the rotation center of the first reflection assembly; the absorber tube is arranged at the position of the rotation center of the first reflecting assembly. In the solar collector provided in the present application, by means of multi-reflection concentration, high concentration is achieved, thereby improving the optical efficiency and the thermal collection efficiency of the solar collector. In addition, by placing the absorber tube at the position of the rotation center of the first concentrator, the effect of not rotating the absorber tube can be achieved, thereby avoiding the problem of liquid leakage of rotary joints of absorber tubes.

Description

A solar heat collector

[0001] The present application claims priority to the Chinese patent application No. 202410736238.4 filed on June 7, 2024, and entitled "A solar heat collector", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of solar thermal power generation, and in particular to a solar heat collector. BACKGROUND

[0003] The parabolic trough solar heat collector installs the heat collecting pipe through the support on the upper part of the trough parabolic reflector, and the sunlight incident on the parabolic reflector is reflected and converged on the heat collecting pipe at the focal line. Except for a small amount of sunlight absorbed and reflected by the glass sleeve, most of the sunlight passes through the glass sleeve to reach the outer wall of the heat absorbing pipe, and is then absorbed and converted into heat energy by the solar selective absorption coating, and then transmitted to the fluid in the pipe through heat conduction and convection.

[0004] The traditional parabolic trough solar heat collector has a large light spot, and if a large-diameter heat collecting pipe is used, the heat loss will increase, and if a small-diameter heat collecting pipe is used, there will be a problem of light overflow, resulting in a decrease in optical efficiency, thereby reducing the heat collecting efficiency of the solar heat collector.

[0005] In addition, when the reflector tracks the sun, the heat collecting pipe needs to rotate with the reflector, and the rotating joint connected thereto is prone to liquid leakage, which poses a safety risk. When the molten salt is emptied, it is prone to solidification at the rotating joint, which makes it difficult to empty. At the same time, the parabolic trough solar heat collector has a large opening, which causes a large wind load, and a heavy support is needed to ensure that it is stressed, resulting in a large unit weight of the heat collector.

[0006] Therefore, how to improve the heat collecting efficiency of the solar heat collector has become a technical problem to be solved by those skilled in the art. SUMMARY

[0007] Therefore, the purpose of the present application is to provide a solar heat collector to improve the heat collecting efficiency of the solar heat collector.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0009] A solar heat collector, comprising:

[0010] The solar energy collector comprises a condenser assembly, a first condenser, a second condenser and a third condenser, the first condenser comprises a support and a first reflecting assembly rotatably arranged on the support, the first reflecting assembly rotates around a rotation center of the first condenser, the second condenser and the third condenser are connected with the first reflecting assembly respectively, and a condensing center of the third condenser coincides with the rotation center of the first reflecting assembly;

[0011] A heat collecting tube is arranged at the rotation center of the first reflecting assembly;

[0012] The first reflecting assembly is used for reflecting the vertically incident sunlight to the second condenser to form first incident light on the second condenser, the second condenser is used for reflecting the first incident light to the heat collecting tube and the third condenser to form second incident light on the third condenser, and the third condenser is used for reflecting the second incident light to the heat collecting tube.

[0013] Optionally, in the above solar energy collector, the first reflecting assembly comprises a first support and at least two first parabolic mirrors with different focal lengths and a common focal line, and a gap for wind passing through is arranged between two adjacent first parabolic mirrors.

[0014] Optionally, in the above solar energy collector, the support comprises a column and a tracking driving device arranged on the column, the tracking driving device is connected with the first support to drive the first reflecting assembly to rotate around the rotation center.

[0015] Optionally, in the above solar energy collector, the second condenser comprises a second parabolic mirror and a second support for mounting the second parabolic mirror, and the second support is connected with the first support.

[0016] Optionally, in the above solar energy collector, a mounting hole for mounting the heat collecting tube is arranged on the tracking driving device, a sleeve ring for sliding fit with the mounting hole is arranged on the heat collecting tube, and one end of the heat collecting tube is arranged to be inclined to the other end.

[0017] Optionally, in the above solar energy collector, the heat collecting tube comprises a metal tube and a heat preservation layer arranged outside the metal tube, and an inner cavity of the metal tube is filled with a heat transfer working medium.

[0018] Optionally, in the above solar energy collector, the heat preservation layer is a transparent aerogel wrapped on an outer wall of the metal tube; or,

[0019] The heat preservation layer is a glass sleeve arranged outside the metal tube, and a vacuum area is arranged between the glass sleeve and the metal tube.

[0020] Optionally, in the solar energy collector, a cross section of the second concentrator is a convex parabola, a focal line of the second concentrator is the same as a focal line of the first concentrator, and the second concentrator and the first concentrator are located on the same side of the focal line.

[0021] Optionally, in the solar energy collector, a cross section of the second concentrator is a concave parabola, a focal line of the second concentrator is the same as a focal line of the first concentrator, and the second concentrator and the first concentrator are located on the opposite sides of the focal line.

[0022] Optionally, in the solar energy collector, a cross section of the third concentrator includes at least one of a parabola, an involute or a circular arc.

[0023] The solar energy collector provided by the application has the following advantages: the first concentrator, the second concentrator and the third concentrator are arranged, the first reflecting component of the first concentrator is rotatably arranged on the support, so that the first reflecting component can rotate around the rotation center of the first concentrator, the second concentrator and the third concentrator are connected with the first reflecting component, the light focusing center of the third concentrator coincides with the rotation center of the first reflecting component, and the heat collecting tube is arranged at the rotation center of the first reflecting component. The vertically incident sunlight is reflected by the first reflecting component of the first concentrator to the second concentrator, so that the first incident light is formed on the second concentrator, the second concentrator reflects the first incident light to the heat collecting tube and the third concentrator, so that the second incident light is formed on the third concentrator, and the third concentrator reflects the second incident light to the heat collecting tube, thereby forming the effect of multiple reflection and concentration.

[0024] Compared with the prior art, the solar energy collector provided by the application has the following advantages: the vertically incident sunlight is reflected by the first reflecting component of the first concentrator to the second concentrator, the light is focused to the heat collecting tube by the second concentrator, and the light overflowing from the heat collecting tube is reflected to the heat collecting tube again by the third concentrator, so that high light concentration is achieved, and the optical efficiency and the heat collecting efficiency of the solar energy collector are improved. Meanwhile, the heat collecting tube is arranged at the rotation center of the first concentrator, so that the first concentrator can rotate without rotating the heat collecting tube, thereby avoiding the problem of liquid leakage of the rotating joint of the heat collecting tube.

[0025] The technical features mentioned above, the technical features mentioned below, and the technical features shown in the drawings alone can be combined with each other arbitrarily as long as the combined technical features are not contradictory. All feasible combinations of features are explicitly described herein. Any one of the multiple sub-features included in the same sentence can be applied independently, and does not have to be applied together with other sub-features. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and all other drawings that can be obtained by those skilled in the art without creative effort based on the provided drawings are within the scope of protection of the present application.

[0027] Fig. 1 is a structural schematic view of a solar heat collector according to an embodiment of the present application;

[0028] Fig. 2 is a light path schematic view of a light collector assembly according to an embodiment of the present application;

[0029] Fig. 3 is a structural schematic view of a solar heat collector according to another embodiment of the present application.

[0030] In the drawings, 100 is a first light collector, 101 is a support member, 1011 is a stand, 1012 is a tracking driving device, 1013 is a mounting hole, 102 is a first reflecting assembly, 1021 is a first bracket, 1022 is a first parabolic mirror, 1023 is a gap, and 103 is a rotation center.

[0031] 200 is a second light collector, 201 is a second parabolic mirror, and 202 is a second bracket.

[0032] 300 is a third light collector.

[0033] 400 is a heat collecting pipe, and 401 is a sleeve ring. DETAILED DESCRIPTION

[0034] The core of the present application is to provide a solar heat collector to improve the heat collecting efficiency of the solar heat collector.

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0036] Solar thermal power generation technology is a promising solar energy utilization technology, which converts solar light into heat energy through mirrors and collectors, and then converts the heat energy into electricity through the Rankine cycle. Commonly used solar collectors include flat plate collectors, vacuum tube collectors, solar air collectors, and focusing solar collectors.

[0037] Among them, the focusing solar collector can significantly improve the collection temperature compared with other collectors. Focusing solar collectors are mainly divided into point focusing collectors and line focusing collectors. Although point focusing solar collectors can obtain high-temperature heat sources of several hundred degrees or even thousands of degrees, the cost is high, and in the field of solar medium-high temperature utilization, such high temperatures are obviously not needed, and sometimes even cause damage to the absorber. At present, line focusing solar thermal systems can be divided into four types according to the types of concentrators: parabolic trough, line focusing Fresnel lens, Fresnel mirror, and non-imaging concentrator.

[0038] The parabolic trough solar collector is a collector that installs the collector tube through the support on the upper part of the parabolic trough reflector. The sunlight incident on the parabolic reflector is reflected and concentrated on the collector tube at the focal line. Except for a small amount of sunlight absorbed and reflected by the glass sleeve, most of the sunlight passes through the glass sleeve to the outer wall of the heat absorption tube, and is then absorbed and converted into heat energy by the solar selective absorption coating. Then, the heat is transferred to the fluid in the tube through conduction and convection.

[0039] The traditional parabolic trough solar collector has the following problems. Firstly, due to the large light spot of the parabolic trough solar collector, if a large-diameter collector tube is used, the heat loss will increase, and if a small-diameter collector tube is used, there will be a problem of light overflow, resulting in a decrease in optical efficiency, thereby reducing the heat collection efficiency of the solar collector. Secondly, when the reflector tracks the sun, the collector tube needs to rotate with the reflector, and the rotating joint connected to it is prone to liquid leakage, which poses a safety risk. In addition, when the molten salt is emptied, it is prone to solidification at the rotating joint, which makes emptying difficult. At the same time, due to the large opening of the parabolic trough solar collector, there is a problem of large wind load, which requires a heavy support to ensure its stress, resulting in a large unit weight of the collector.

[0040] To this end, as shown in FIGS. 1-3, the embodiment of the present application discloses a solar collector, comprising a light collector assembly and a heat collecting tube 400. By using the way of multiple reflection light collection, the vertically incident sunlight is reflected to the second light collector 200 by the first reflection assembly 102 of the first light collector 100, and the light is focused on the heat collecting tube 400 by the second light collector 200, and the light overflowing from the heat collecting tube 400 is reflected to the heat collecting tube 400 again by the third light collector 300, so that high multiple light collection is realized, and the optical efficiency and heat collecting efficiency of the solar collector are improved. Meanwhile, by placing the heat collecting tube 400 at the position of the rotation center 103 of the first light collector 100, the effect that the first light collector 100 rotates while the heat collecting tube 400 does not rotate can be realized, so that the problem of liquid leakage of the rotating joint of the heat collecting tube 400 is avoided.

[0041] The solar collector disclosed by the embodiment of the present application will be explained and described in detail below in combination with FIGS. 1-3.

[0042] As shown in FIGS. 1 and 3, the light collector assembly comprises the first light collector 100, the second light collector 200 and the third light collector 300, and the first light collector 100 comprises a support 101 and a first reflection assembly 102 rotatably arranged on the support 101. The first reflection assembly 102 can reflect the vertically incident sunlight to the second light collector 200, and the first reflection assembly 102 can rotate around the rotation center 103 of the first light collector 100, so that the position of the sun can be effectively tracked, and it is ensured that the first reflection assembly 102 always faces the sun, so that the collection efficiency of solar energy is maximized. The second light collector 200 and the third light collector 300 are connected with the first reflection assembly 102 respectively, so that the second light collector 200 and the third light collector 300 can rotate synchronously with the first reflection assembly 102. It should be noted that the rotation center 103 is the axis center line located on the center plane of symmetry of the first light collector 100 and parallel to the focal line of the first light collector 100, and the first reflection assembly 102 can rotate circumferentially around the axis center line.

[0043] In addition, in order to ensure that the heat collecting tube 400 does not rotate with the first reflection assembly 102, the heat collecting tube 400 is arranged at the position of the rotation center 103 of the first reflection assembly 102, so that the light collector assembly can rotate around the heat collecting tube 400. Meanwhile, in order to ensure that the third light collector 300 can reflect the light overflowing from the heat collecting tube 400 to the heat collecting tube 400 again, the light collecting center of the third light collector 300 is located on the rotation center 103 of the first reflection assembly 102, i.e. the light collecting center of the third light collector 300 coincides with the rotation center 103 of the first reflection assembly 102, so that the light incident on the third light collector 300 can be reflected to the heat collecting tube 400 again, high multiple light collection is realized, and the optical efficiency and heat collecting efficiency of the solar collector are improved.

[0044] When the solar collector works, as shown in FIG. 2, the vertically incident sunlight is reflected by the first reflecting component 102 of the first light collector 100 to the second light collector 200 to form the first incident light on the second light collector 200, the second light collector 200 reflects the first incident light to the heat collecting tube 400 and the third light collector 300 to form the second incident light on the third light collector 300, and the third light collector 300 reflects the second incident light to the heat collecting tube 400, thereby forming the effect of multiple reflection and light collection. By means of multiple reflection, the first light collector 100 adopts an ultra-large opening, the second light collector 200 and the third light collector 300 realize high-multiple light collection to the heat collecting tube 400 located at the rotation center of the trough type collector, thereby reducing the diameter of the heat collecting tube 400, avoiding light leakage, reducing heat loss, and at the same time, by arranging the heat collecting tube 400 at the rotation center position of the first reflecting component 102, there is no need to install a rotating joint, and the problem of liquid leakage of the rotating joint of the heat collecting tube 400 can be effectively avoided.

[0045] Further, as shown in FIGS. 1 and 3, the first light collector 100 adopts an ultra-large opening trough light collector, and the first reflecting component 102 includes a first support 1021 and at least two first parabolic mirrors 1022 with different focal lengths and a common focal line mounted on the first support 1021. In this embodiment, two first parabolic mirrors 1022 with different focal lengths and a common focal line are adopted, the interval between the two first parabolic mirrors 1022 with different focal lengths is adjusted to make the two first parabolic mirrors 1022 with different focal lengths achieve the purpose of a common focal line, thereby ensuring that the sunlight vertically incident to the first parabolic mirror 1022 can be reflected to the second light collector 200, and at the same time, by adjusting the interval between the two first parabolic mirrors 1022 with different focal lengths, a gap 1023 capable of allowing wind to pass through can be formed between adjacent two first parabolic mirrors 1022, thereby reducing the effective wind resistance, reducing the wind load applied to the first parabolic mirror 1022, and improving the service life of the solar collector.

[0046] Specifically, for the convenience of understanding, the two first parabolic mirrors 1022 with different focal lengths are defined as a first mirror and a second mirror respectively, and the first parabolic mirror 1022 closer to the heat collecting pipe 400 is defined as the first mirror, and the first parabolic mirror 1022 farther from the heat collecting pipe 400 is defined as the second mirror. The support 101 includes a column 1011 at both ends of the first support 1021 and a tracking driving device 1012 arranged on the column 1011. The first support 1021 adopts a truss structure system symmetrically distributed on both sides of the heat collecting pipe 400, and the first support 1021 includes a plurality of single-truss trusses distributed along the axial direction of the heat collecting pipe 400, and each single-truss truss can be connected by a plurality of connecting rods. At the same time, the first mirror and the second mirror are two respectively, and each first mirror and second mirror is symmetrically fixed on the connecting rod of the first support 1021 with respect to the heat collecting pipe 400, that is, each side of the heat collecting pipe 400 is distributed with a first mirror and a second mirror, and a space for installing the heat collecting pipe 400 is left between the adjacent first mirrors, so that the heat collecting pipe 400 can be installed at the rotation center position between the adjacent first mirrors, and at the same time, the second condenser 200 can reflect the first incident light to the third condenser 300 to form the second incident light on the third condenser 300, and the third condenser 300 reflects the second incident light to the heat collecting pipe 400, thereby forming the effect of multiple reflection condensation. By connecting the connecting rod of the first support 1021 with the tracking driving device 1012, the first support 1021 is driven to rotate by the tracking driving device 1012 to drive the first parabolic mirror 1022 to rotate.

[0047] It should be noted that the cross section of the first parabolic mirror 1022 is a convex parabola, that is, a convex mirror, and the first mirror and the second mirror can adopt a split structure along the axial direction of the heat collecting pipe 400, or an integral structure, which is not limited herein.

[0048] Further, as shown in FIG. 1 and FIG. 3, in order to realize that the heat collecting pipe 400 does not rotate synchronously with the first reflecting assembly 102, a mounting hole 1013 for mounting the heat collecting pipe 400 can be arranged on the tracking driving device 1012, and a sleeve ring 401 which is in sliding fit with the mounting hole 1013 is arranged on the heat collecting pipe 400. Specifically, the tracking driving device 1012 comprises 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 the mounting hole 1013 for mounting the heat collecting pipe 400 and a bearing hole sleeved on the connecting rod of the first support 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 support 1021 to rotate at this time, and since the sleeve ring 401 on the heat collecting pipe 400 is in sliding fit with the mounting hole 1013 on the bearing member, the bearing member can rotate around the heat collecting pipe 400 on the mounting hole 1013, thereby realizing the purpose that the heat collecting pipe 400 does not rotate synchronously with the first reflecting assembly 102, and effectively avoiding the problem of liquid leakage of the rotary joint of the heat collecting pipe 400. Meanwhile, the heat collecting pipe 400 comprises a metal pipe and a heat preservation layer located outside the metal pipe, and the inner cavity of the metal pipe is filled with heat transfer working medium. In order to ensure that the heat transfer working medium in the heat collecting pipe 400 can be smoothly discharged, the height of the bearing seat at both ends of the heat collecting pipe 400 can be adjusted, thereby realizing that one end of the heat collecting pipe 400 is obliquely arranged to the other end, so that the heat transfer working medium can be smoothly discharged under the action of its own gravity along the heat collecting pipe 400.

[0049] It should be noted that the driving member of the tracking driving device 1012 can be, but is not limited to, a servo motor or a hydraulic cylinder. Meanwhile, in order to realize that the tracking driving device 1012 can track and capture the sunlight, a photosensitive sensor can be arranged on the tracking driving device 1012, so as to realize that the first reflecting assembly 102 always faces the sun through the cooperation of the photosensitive sensor and the driving member, which can effectively track the position of the sun and maximize the collection efficiency of solar energy. Of course, the tracking driving device 1012 can also adopt a conventional driving mechanism which can realize tracking the position of the sunlight and simultaneously drive the first reflecting assembly 102 to rotate, and details are not described herein.

[0050] Further, the second light collector 200 comprises a second parabolic mirror 201 and a second support 202 for mounting the second parabolic mirror 201, and the second support 202 is connected with the first support 1021. Specifically, the second parabolic mirror 201 is an integral structure along the axial direction of the heat collecting pipe 400, and the second parabolic mirror 201 is supported by the second support 202 at both ends of the second parabolic mirror 201, so as to be fixed above the heat collecting pipe 400, thereby enabling the second parabolic mirror 201 to reflect the first incident light reflected by the first reflecting assembly 102 of the first light collector 100 to the heat collecting pipe 400 and the third light collector 300 again. The second support 202 can adopt a truss structure system, so as to effectively reduce the weight of the second support 202 while ensuring the strength of supporting the second parabolic mirror 201, thereby saving the cost of the entire solar collector. In order to ensure that the first reflecting assembly 102 of the first light collector 100 reflects the vertically incident sunlight to the second light collector 200, so as to form the first incident light on the second light collector 200, and the second light collector 200 reflects the first incident light to the heat collecting pipe 400 and the third light collector 300, the focal line of the second light collector 200 needs to be the same as the focal line of the first light collector 100, i.e. the focal line of the second light collector 200 coincides with the focal line of the first light collector 100, as shown in FIGS. 1 and 3.

[0051] Further, the third light collector 300 can be arranged on the first support 1021, and the third light collector 300 is located below the heat collecting pipe 400, as shown in FIG. 2, so as to ensure that the light overflowing from the heat collecting pipe 400 can be reflected to the heat collecting pipe 400 again by the third light collector 300, thereby realizing high-magnification light collection and improving the optical efficiency and heat collecting efficiency of the solar collector. The cross section of the third light collector 300 comprises at least one of a parabola, an involute or a circular arc, and the light collection center of the third light collector 300 is located at the rotation center of the first reflecting assembly 102, i.e. the light collection center of the third light collector 300 is located at the position of the heat collecting pipe 400. In this embodiment, the third light collector 300 can adopt a compound parabolic concentrator (CPC) light collector, which can uniformly distribute the incident sunlight to the heat collecting pipe 400, thereby ensuring the uniformity of heat conduction of the heat collecting pipe 400. It should be noted that the compound parabolic concentrator (CPC) light collector refers to two symmetrical parabolic surfaces sharing one focal point, so as to ensure that the light incident from any direction can be effectively focused.

[0052] As shown in FIG. 1, in an embodiment, the opening width of the first concentrator 100 is 14 m, the heat collecting tube 400 comprises a metal tube and a heat preservation layer outside the metal tube, the heat preservation layer of the heat collecting tube 400 can be transparent aerogel wrapped on the outer wall of the metal tube, the metal tube is filled with heat transfer working 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 mirror 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 mirror 201 and the first reflecting assembly 102 are located on the lower side (the view angle of FIG. 1) of the focal line. Moreover, the third concentrator 300 is a composite parabolic CPC concentrator composed of a parabola and an involute. By using the multiple light concentrating reflection mode in the above embodiment, the highest light concentration ratio can reach 155, thereby realizing the effect of high-multiple light concentration.

[0053] Of course, the second concentrator 200 and the first concentrator 100 can also be located on the different sides of the focal line, that is, different sides, as shown in FIG. 3, in another embodiment, the opening width of the first concentrator 100 can be 20 m, and the heat collecting tube 400 is a vacuum heat collecting tube, that is, the heat collecting tube 400 comprises a metal tube and a heat preservation layer outside the metal tube, a vacuum zone is arranged between the heat preservation layer and the metal tube, and the metal tube is filled with heat transfer working medium. In this embodiment, the heat preservation layer can be a glass sleeve arranged outside the metal tube, air is removed between the glass sleeve and the metal tube by a pumping 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. Moreover, in this embodiment, as shown in FIG. 3, the cross section of the second concentrator 200 is a concave parabola, that is, the second parabolic mirror 201 is a concave lens, at this time, the second concentrator 200 and the first concentrator 100 are located on the different sides of the focal line, that is, the second parabolic mirror 201 is located on the upper side of the focal line, and the first reflecting assembly 102 is located on the lower side (the view angle of FIG. 3) of the focal line. Moreover, the third concentrator 300 is a composite parabolic CPC concentrator composed of an involute and a circular arc. By using the multiple light concentrating reflection mode in the above embodiment, the highest light concentration ratio can reach 200, thereby realizing the effect of high-multiple light concentration.

[0054] It should be noted that the heat transfer working medium in the above embodiment can be, but is not limited to, molten salt, and can also be heat conducting oil or a mixture of water and ethylene glycol.

[0055] The terms "first" and "second" and the like in the description and claims of the present application and the above drawings are used to distinguish different objects, and are not used to describe a specific order. Moreover, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can include steps or units not listed.

[0056] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and, while certain embodiments according to the principles set forth herein have been shown and described, various modifications and substitutions can be made thereto without departing from the spirit and scope of the application as these broadly disclosed. Therefore, the application is not to be limited only to the embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A solar collector, characterized by, The application relates to a solar energy collection device, which comprises the following components: a light collector assembly, which comprises a first light collector (100), a second light collector (200) and a third light collector (300), the first light collector (100) comprises a support (101) and a first reflection assembly (102) rotatably arranged on the support (101), the first reflection assembly (102) rotates around a rotation center (103) of the first light collector (100), the second light collector (200) and the third light collector (300) are connected with the first reflection assembly (102) respectively, and the light collection center of the third light collector (300) coincides with the rotation center (103) of the first reflection assembly (102); a heat collecting pipe (400) arranged at the position of the rotation center (103) of the first reflection assembly (102); wherein the first reflection assembly (102) is used for reflecting vertically incident sunlight onto the second light collector (200) to form first incident light on the second light collector (200), the second light collector (200) is used for reflecting the first incident light onto the heat collecting pipe (400) and the third light collector (300) to form second incident light on the third light collector (300), and the third light collector (300) is used for reflecting the second incident light onto the heat collecting pipe (400).

2. The solar collector of claim 1, wherein, The first reflection assembly (102) comprises a first support (1021) and at least two first parabolic mirrors (1022) with different focal lengths and a common focal line and arranged on the first support (1021), and a gap (1023) for wind passing through is arranged between adjacent two first parabolic mirrors (1022).

3. The solar collector of claim 2, wherein, The support (101) comprises a column (1011) and a tracking driving device (1012) arranged on the column (1011), the tracking driving device (1012) is used for being connected with the first support (1021) to drive the first reflection assembly (102) to rotate around the rotation center (103).

4. The solar collector of claim 3, wherein, The second light collector (200) comprises a second parabolic mirror (201) and a second support (202) used for arranging the second parabolic mirror (201), and the second support (202) is connected with the first support (1021).

5. The solar collector of claim 3, wherein, An installation hole (1013) used for arranging the heat collecting pipe (400) is arranged on the tracking driving device (1012), a sleeve ring (401) used for slidingly matching with the installation hole (1013) is arranged on the heat collecting pipe (400), and one end of the heat collecting pipe (400) is arranged to be inclined to the other end.

6. The solar collector of claim 5, wherein, The heat collecting pipe (400) comprises a metal pipe and a heat preservation layer arranged outside the metal pipe, and the inner cavity of the metal pipe is filled with a heat transfer working medium.

7. The solar collector of claim 6, wherein, The heat preservation layer is transparent aerogel wrapped on the outer wall of the metal pipe; or The heat preservation layer is a glass sleeve arranged outside the metal pipe, and a vacuum area is arranged between the glass sleeve and the metal pipe.

8. The solar collector of claim 1, wherein, 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), and the second condenser (200) and the first condenser (100) are located on the same side of the focal line respectively.

9. The solar collector of claim 1, wherein, The cross section of the second condenser (200) is a concave parabola, and the focal line of the second condenser (200) is the same as that of the first condenser (100), and the second condenser (200) and the first condenser (100) are located on the opposite side of the focal line respectively.

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

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