Roof flat plate type solar heat collection plate

Abstract

The invention relates to the technical field of solar heat collection plates, in particular to a roof flat plate type solar heat collection plate which comprises an outer frame, a heat absorption plate, first tempered glass and second tempered glass, the heat absorption plate, the first tempered glass and the second tempered glass are embedded in the outer frame, the first tempered glass is installed on the back face of the heat absorption plate, and the second tempered glass is installed on the heat absorption face of the heat absorption plate; multiple pieces of third tempered glass which are arranged at equal intervals are installed at the top of the second tempered glass, a maintaining space is formed between the multiple pieces of third tempered glass, an isolation transverse frame is fixedly installed in the maintaining space of the second tempered glass, an assembly cavity is formed in the isolation transverse frame, a slit is formed in the inner top of the assembly cavity, and the second tempered glass is fixedly installed in the slit. Through cooperation of the bimetallic strip driver and the functional jacking component, passive low-temperature triggering icebreaking, sharp teeth and step glass synergistically collapsing an accumulated snow structure and efficiently removing loads are achieved, the narrow frame and micro groove design is combined, and the snow removal path and the heat collection efficiency are optimized.

Description

Technical Field

[0001] This invention relates to the technical field of solar collectors, specifically a rooftop flat-plate solar collector. Background Technology

[0002] Flat-plate solar collectors on rooftops are a type of photothermal conversion equipment widely used in building heating. Their core components include a heat-absorbing plate, a transparent cover, an insulation layer, and an outer shell. They are typically installed on building rooftops at a certain angle to efficiently collect solar energy.

[0003] However, in high-latitude or frigid regions, frequent snowfall and its accumulation in winter pose a severe challenge to the system. The continuous snow cover on the surface of the collector plate not only blocks light, causing the system efficiency to drop to zero, but its huge static load and wind load are also more likely to exceed the design limits, causing deformation of the collector plate, damage to the support, and even potential safety hazards to the roof structure.

[0004] Solving this problem is particularly urgent. Although there are methods such as electric heating for snow melting or manual cleaning, the former consumes a lot of energy and violates the original intention of energy conservation, while the latter is inefficient and poses safety risks. Therefore, the industry urgently needs a passive snow removal solution that is efficient, reliable and requires no additional energy to remove snow before the snow load accumulates to a dangerous level, thereby ensuring the long-term stable operation of the system in harsh environments. Summary of the Invention

[0005] This invention provides a roof-mounted flat-plate solar collector panel that achieves passive low-temperature triggered ice breaking through the cooperation of a bimetallic strip actuator and a functional lifting component. The sharp teeth and stepped glass work together to disintegrate the snow accumulation structure and efficiently remove the load. Combined with the narrow frame and micro-groove design, the snow removal path and heat collection efficiency are optimized. The entire system significantly improves the safety and energy efficiency of the collector panel in severe cold and snowy environments.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A rooftop flat-plate solar collector panel, comprising: The structure includes an outer frame and an internally mounted heat-absorbing plate, a first tempered glass, and a second tempered glass. The first tempered glass is mounted on the back of the heat-absorbing plate, and the second tempered glass is mounted on the heat-absorbing surface of the heat-absorbing plate. Multiple equidistant third tempered glass panes are mounted on top of the second tempered glass panes, with a support space between them. An isolation frame is fixedly installed within the support space of the second tempered glass panes. An assembly cavity is formed inside the isolation frame, and a slit is formed at the top of the assembly cavity. A cold-sensitive actuator is installed inside the assembly cavity, and a functional lifting component that can pass through the slit is also installed inside the assembly cavity. The cold-sensitive actuator can control the functional lifting component to pass through the slit under a preset low-temperature environment.

[0007] Optionally, the cold-sensitive actuator includes a mounting base fixedly installed inside the assembly cavity. The mounting base has two side seats, and a bimetallic strip is limited and installed between the two side seats. The bimetallic strip includes a pre-compressed passive layer and an active layer with upper and lower double layers. The expansion coefficient of the active layer is greater than that of the passive layer. The bimetallic strip will be pre-compressed to a concave state at high temperature, and the bimetallic strip will instantly jump to a convex state at the center after encountering a preset cold change temperature. The concave area at the center of the bimetallic strip abuts against the bottom of the functional lifting component.

[0008] Optionally, the mounting base also has a top layer, on which a guide channel is provided, and a linkage column is slidably installed in the guide channel. The bottom end of the linkage column abuts against the central recessed area of ​​the bimetallic sheet, and the bottom of the functional lifting component is fixedly connected to the top of the linkage column.

[0009] Optionally, the top of the functional lifting component is designed with multiple sharp serrations, the sharp serrations being located within a slit, and a rubber partition strip is installed on the inner wall of the slit, which fits tightly against the functional lifting component and the sharp serrations. The rubber partition strip and the functional lifting component together seal the slit.

[0010] Optionally, the active layer is made of CuZn36 and placed in the lower layer, and the passive layer is made of FeNi36 and placed in the upper layer; under conditions 60-80℃ higher than the working temperature, the bimetallic sheet is forcibly pressed into a pre-stable state with a concave center and fixed by an outer ring limiting method.

[0011] Optionally, the thickness of the multiple third tempered glass panes increases sequentially in equal increments according to their arrangement order, forming a stepped state. When the outer frame and the heat absorption plate are installed at an angle, the thickness of the third tempered glass pane located at the higher position is greater than the thickness of the third tempered glass pane located at the lower position.

[0012] Optionally, the surfaces of the third tempered glass are designed with periodic and micron-sized oriented microgrooves, and the oriented microgrooves are parallel to the tilt direction of the heat absorber.

[0013] Optionally, the outer frame has a narrow edge design, and the thickness of the outer frame in the direction of the heat absorption surface of the heat absorption plate is lower than the thickness of the third tempered glass. The isolation horizontal frame also includes an isolation vertical frame that surrounds and fits tightly around the multiple third tempered glass panes. The isolation vertical frame and the isolation horizontal frame are integrally formed and constitute an assembly frame.

[0014] Optionally, an insulation layer is filled between the circumferential periphery of the heat absorber plate and the inner wall of the outer frame. A rotating channel is opened inside the heat absorber plate, and the first and last ends of the rotating channel penetrate the outer wall of the heat absorber plate. A working fluid pipe is installed in the rotating channel, and the first and last ends of the working fluid pipe are connected to an external working fluid heat exchange device.

[0015] This invention provides a roof-mounted flat-plate solar collector panel, which has the following advantages compared to existing technologies: I. The cooperation between the cold-sensitive actuator and the functional lifting component: This structure pre-presses and shapes the bimetallic strip and confines it between the side seats of the mounting base. When the ambient temperature drops to the preset cold change temperature, it can instantly release the accumulated internal stress based on the huge difference in the thermal expansion coefficients of the active and passive layers, generating a sudden jump action from "center concave" to "center convex". This jump is precisely lifted upward through the linkage column that contacts it or directly acts on the functional lifting component, allowing it to pass through the slit. The core advantage of this cooperation is that it does not require any external power input. It relies entirely on the natural condition of ambient temperature change as the trigger signal, realizing a purely mechanical automatic control. The instantaneous lifting of the functional lifting component can efficiently shear and destroy the ice bridge connection of the snow layer covering the third tempered glass, providing the most critical initial power to solve the problem of excessive wind and snow load, fundamentally changing the traditional snow removal mode that relies on external energy or manual intervention.

[0016] Second, the combination of the sharp serrated design of the functional lifting component and the stepped third tempered glass layout enables multi-scale and high-efficiency snow adhesion structure. The sharp serrated design at the top of the functional lifting component is not a simple protrusion, but a carefully designed stress concentrator. When it is lifted, these tiny serrations concentrate the force on several very small points, generating enormous pressure. Like an "icebreaker," it easily pierces and tears through the solid ice bridge network, causing the cracks to spread rapidly from point to surface. At the same time, multiple third-stage tempered glass units are arranged in a stepped pattern with equal thickness from high to low, artificially creating weak surfaces inside the snow layer on a macroscopic level. When the bottom ice layer is broken by the serrations, the stepped cross-section causes the upper snow layer to lose its support from below, making it more prone to segmented sliding and collapse under gravity. This combination of microscopic serration piercing and macroscopic stepped sliding constitutes a synergistic ice-breaking mechanism from micro to macro, greatly improving the thoroughness and efficiency of snow removal and ensuring that the load can be quickly eliminated.

[0017] Fifth, the coordination between the narrow-edge outer frame, the directional microgrooved surface, and the overall isolation frame optimizes heat collection performance and protects the structure while ensuring efficient snow removal. The narrow-edge design of the outer frame minimizes its mechanical obstruction effect on sliding snow, clearing an unobstructed exit for the snow and preventing the formation of "snow dams" due to excessive frame height. Secondly, the periodic directional microgrooves manufactured on the surface of the third tempered glass act like an invisible "track" for the snow. When the bottom ice layer is broken, the grooves guide the snow water to flow in a directional manner and significantly reduce sliding friction resistance, promoting the overall sliding of the snow. Finally, the assembly frame, which is integrally formed from the isolation horizontal and vertical frames, not only provides a stable installation foundation for the cold-sensitive actuator, but more importantly, it divides the third tempered glass into multiple independent modules and localizes the impact ice-breaking range, effectively preventing damage to the entire glass panel due to localized stress, while enhancing the structural rigidity of the entire panel and its protection of the internal heat-absorbing plate and insulation layer. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the exterior of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the right-side view structure; Figure 3 For the present invention Figure 1 A top-view structural diagram; Figure 4 For the present invention along Figure 3 A schematic diagram of the structure viewed in section AA; Figure 5 For the present invention Figure 3 Enlarged structural diagram at point B; Figure 6 For the present invention Figure 4 Enlarged structural diagram at point C; Figure 7 This is a schematic diagram of the structure of the heat absorption plate and the working fluid channel in this invention; Figure 8 This is a three-dimensional structural breakdown diagram of the present invention.

[0019] In the diagram: 1. Outer frame; 2. Heat absorber plate; 3. Working fluid pipe; 4. First tempered glass; 5. Insulation layer; 6. Second tempered glass; 7. Third tempered glass; 8. Isolation horizontal frame; 9. Rubber partition strip; 11. Functional lifting component; 12. Assembly cavity; 13. Assembly base; 14. Bimetallic strip; 15. Linkage column; 16. Isolation vertical frame. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1 to 8 This invention provides a technical solution: a rooftop flat-plate solar collector, comprising: The outer frame 1 includes a heat-absorbing plate 2, a first tempered glass 4, and a second tempered glass 6 embedded within it. The first tempered glass 4 is installed on the back of the heat-absorbing plate 2, and the second tempered glass 6 is installed on the heat-absorbing surface of the heat-absorbing plate 2. Multiple equidistant third tempered glass 7s are installed on the top of the second tempered glass 6, with a holding space between the multiple third tempered glass 7s. An isolation cross frame 8 is fixedly installed within the holding space of the second tempered glass 6. An assembly cavity 12 is opened inside the isolation cross frame 8, and a slit is opened at the top of the inner part of the assembly cavity 12. A cold-sensitive actuator is installed inside the assembly cavity 12, and a functional lifting component 11 that can pass through the slit is installed inside the assembly cavity 12. The cold-sensitive actuator can control the functional lifting component 11 to pass through the slit under a preset low-temperature environment.

[0022] This invention is primarily designed for cold, snowy regions, where the density of fresh snowfall is approximately 100 kg / m³. 3 The density of compacted, damp, or wet snow can reach up to 500 kg / m³. 3Even higher. If it's wet snow, assuming the collector plate area is 2 square meters and the snow thickness is 0.3 meters, its weight could reach 300 kilograms. This is equivalent to adding the weight of several adults to the collector and its supporting structure. As a result, the static wind and snow load on the collector plate and its mounting frame would be too great, otherwise structural deformation, connection failure, or even collapse could occur. Secondly, even a thin layer of snow can reflect and scatter most of the solar radiation. After the glass cover is completely covered by snow, the collector is basically isolated from the outside world, the heat conversion process stops, and the reflectivity of fresh snow can be extremely high. This means that only a very small amount of sunlight can be absorbed, making it extremely difficult to melt snow using solar heat. Electric snow melting requires electricity, reducing the system's net energy gain, and necessitates additional control and sensing systems. In this invention, by designing a space, an isolation frame 8, a slit, and a functional lifting component 11, the functional lifting component 11, under the action of a cold-sensitive actuator, can pass through the slit and impact the ice layer at the bottom of the snow accumulation, disrupting the ice layer's connection and creating a height difference. This allows the segmented snow accumulation sections to loosen and slide down under gravity, eliminating the load and restoring balance. Regarding light transmittance, specifically, snow, especially slightly melted and re-frozen snow, adheres to the glass surface primarily through two forces: first, mechanical interlocking, the interlocking of snow crystals with the microscopically rough surface of the glass; and second, ice bridging, where the water film formed by melting snow refreezes at the glass interface, creating a strong solid connection. When the functional lifting component 11 is lifted upwards, the following effects occur: first, shear failure, introducing a local abrupt change in height at the interface between the snow and the third tempered glass 7. This abrupt change generates enormous shear stress on the wide-area ice bridging connection, causing it to break; and then, stress concentration effect. Each "protrusion" becomes a stress concentration point, like the starting point of tearing Velcro. Cracks will rapidly expand from this point to the entire snow layer, eventually reducing static friction. Once a tiny gap appears between the snow layer and the glass surface, the overall static friction will drop sharply. Under the influence of the component of gravity along the inclined plane, the snow will slide off more easily. Therefore, when the functional lifting component 11 lifts up to form a protrusion and height difference, it can effectively break the interlocking and ice bridge connection between the snow and ice layer and the surface of the third tempered glass 7, allowing the snow to slide off, eliminating the static load on the heat absorption plate 2 and the outer frame 1, and improving safety performance.

[0023] In a preferred embodiment, the cold-sensitive actuator includes a mounting base 13 fixedly installed inside the assembly cavity 12. The mounting base 13 has two side seats, and a bimetallic strip 14 is positioned between the two side seats. The bimetallic strip 14 includes a pre-compressed passive layer and an active layer, with the expansion coefficient of the active layer being greater than that of the passive layer. The bimetallic strip 14 is pre-compressed to a concave-center state at high temperatures, and upon encountering a preset cold-change temperature, it instantly jumps to a convex-center state. The concave-center region of the bimetallic strip 14 abuts against the bottom of the functional lifting component 11. (See also...) Figure 3 , Figure 4 and Figure 6 In this embodiment, the two ends of the bimetallic strip 14 are limited by two side seats, which can be rotational or snap-fit. When the snow covers the area, the temperature of the heat-absorbing plate 2 and the isolation frame 8 decreases, and the low temperature is transferred to the bimetallic strip 14. When the preset cold change temperature is reached, the bimetallic strip 14 is composed of two metal layers with different thermal expansion coefficients. The expansion coefficient of the active layer is greater than that of the passive layer, so that the shrinkage of the lower active layer is greater than that of the upper passive layer, and the internal stress is released instantly, resulting in a sudden jump or rebound, which changes the concave center to a convex center, thereby triggering the functional lifting component 11 to move upward and pass through the slit, impacting or lifting the ice layer, creating a height difference, and breaking the snow and ice layer.

[0024] During the cooling process, the active layer always wants to shrink, while the passive layer shrinks less, which leads to a continuous increase in internal stress until it reaches a threshold, thus triggering the process. This is the principle and process of internal stress release.

[0025] Based on the cold-sensitive actuator embodiment, the mounting base 13 also has a top layer with a guide channel. A linkage column 15 is slidably installed in the guide channel. The bottom end of the linkage column 15 abuts against the central recessed area of ​​the bimetallic strip 14, and the bottom of the functional lifting component 11 is fixedly connected to the top of the linkage column 15. In this embodiment, the guide channel is used to guide and limit the sliding of the linkage column 15, to prevent the linkage column 15 from being out of position or escaping, and to prevent the action from failing despite successful triggering, which would lead to the destruction of the ice layer.

[0026] Based on the cold-sensitive actuator embodiment, the top of the functional lifting component 11 is designed with multiple sharp serrations, the sharp serrations being located within a slit. A rubber partition strip 9, which fits tightly against the functional lifting component 11 and the sharp serrations, is installed on the inner wall of the slit. The rubber partition strip 9 and the functional lifting component 11 together seal the slit. Please refer to the enlarged details. Figure 5In this embodiment, the cooperation between the two rubber partition strips 9 and the functional lifting component 11 can improve the sealing performance of the assembly cavity 12 and prevent external contamination from interfering with the interior of the assembly cavity 12. At the same time, the flexibility of the rubber partition strips 9 can prevent interference with the sudden jump of the functional lifting component 11, providing redundancy and preventing failure. Furthermore, by designing sharp serrations, the stress concentration effect can be improved, which can more effectively break the ice layer, causing it to crack like a spider web, greatly reducing the adhesion with the third tempered glass 7.

[0027] Based on the cold-sensitive actuator embodiment, the active layer is made of CuZn36 and placed in the lower layer, and the passive layer is made of FeNi36 and placed in the upper layer. Under conditions 60-80°C higher than the operating temperature, the bimetallic strip 14 is forcibly pressed into a pre-stable state with a concave center and fixed by an outer ring limiting method. In this embodiment, CuZn36 is brass and FeNi36 is Invar alloy, wherein the coefficient of thermal expansion of brass is 17-20×10⁻⁶. -6 K -1 The coefficient of thermal expansion of Invar alloy is 1.2 × 10⁻⁶. -6 K -1 Furthermore, brass has good deformation and shrinkage properties, and can be reused.

[0028] Based on the serrated embodiment, the thickness of multiple third tempered glass panes 7 increases sequentially and equally in a stepped manner. When the outer frame 1 and the heat absorber 2 are installed at an angle, the thickness of the third tempered glass pane 7 at the higher position is greater than the thickness of the third tempered glass pane 7 at the lower position. Please refer to [link to relevant documentation]. Figure 2 The multiple third tempered glass 7 are designed in a stepped state. When snow accumulates, the snow layer closer to the bottom is thicker and more likely to slide off after the ice breaks.

[0029] Furthermore, multiple third tempered glass surfaces 7 are designed with periodic and micron-level oriented microgrooves, which are parallel to the tilt direction of the heat absorber plate 2. These oriented microgrooves can be designed on the surface of the third tempered glass 7 by etching, imprinting, and laser processing. The grooves parallel to the tilt direction can act as natural "snow guide channels," providing a preferred path for snow to slide down and reducing lateral resistance. The existence of the microstructure itself is a large number of stress concentration points. When snow slides down due to its own weight or mechanical triggering, cracks will preferentially expand from these points. Snow crystals only contact the protruding parts of the microstructure, greatly reducing the adhesion area and mechanical interlocking effect.

[0030] Furthermore, the outer frame 1 has a narrow edge design, and the thickness of the outer frame 1 in the direction of the heat absorption surface of the heat absorption plate 2 is lower than the thickness of the third tempered glass 7. The isolation horizontal frame 8 also includes an isolation vertical frame 16 that surrounds the outside of multiple third tempered glass 7 and fits tightly. The isolation vertical frame 16 and the isolation horizontal frame 8 are integrally formed to form an assembly frame. The narrow frame design can prevent the outer frame 1 from obstructing the sliding of snow. The integral forming of the isolation horizontal frame 8 and the isolation vertical frame 16 can improve the circumferential protection of the third tempered glass 7.

[0031] Furthermore, an insulation layer 5 is filled between the circumferential periphery of the heat absorber plate 2 and the inner wall of the outer frame 1. A rotating channel is opened inside the heat absorber plate 2, and the beginning and end of the rotating channel penetrate through the outer wall of the heat absorber plate 2. A working fluid pipe 3 is installed inside the rotating channel, and the beginning and end of the working fluid pipe 3 are connected to the external working fluid heat exchange equipment.

[0032] By utilizing the aforementioned structural combinations, a highly efficient, reliable, and completely passive rooftop solar collector snow removal system was constructed. Its core benefits are as follows: First, the use of a bimetallic strip cold-sensitive actuator enables automatic low-temperature triggering without external energy. Through the instantaneous jump of the functional lifting component, the ice bridge connections at the bottom of the snow are precisely disrupted, fundamentally breaking down its adhesion. Second, the synergistic design of the sharp serrations and stepped glass achieves multi-scale ice breaking, encompassing both micro-stress concentration and macro-segmented sliding, significantly improving snow removal efficiency. Third, the sealing design, including rubber partition strips, ensures the long-term durability of the actuating mechanism in harsh environments. Furthermore, specific materials and processes ensure the reliability of the actuating mechanism after tens of thousands of repetitions. Finally, the combination of the narrow-edge frame, directional microgrooves, and overall isolation frame optimizes the snow sliding path while ensuring the normal operating efficiency of the solar collector and the overall structural safety. In summary, this invention effectively solves the problems of snow load and light shading on solar collectors in high-altitude and cold regions, significantly improving the system's safety and overall energy efficiency throughout the year.

[0033] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural parts described in the specification and drawings can also be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rooftop flat-plate solar collector, characterized in that: include: The outer frame (1) and the heat-absorbing plate (2), the first tempered glass (4) and the second tempered glass (6) embedded therein, wherein the first tempered glass (4) is installed on the back of the heat-absorbing plate (2) and the second tempered glass (6) is installed on the heat-absorbing surface of the heat-absorbing plate (2); The top of the second tempered glass (6) is equipped with a plurality of third tempered glass (7) arranged at equal intervals. There is a holding space between the plurality of third tempered glass (7). An isolation frame (8) is fixedly installed in the holding space of the second tempered glass (6). An assembly cavity (12) is opened inside the isolation frame (8). A slit is opened at the top of the assembly cavity (12). A cold-sensitive actuator is installed inside the assembly cavity (12). A functional lifting component (11) that can pass through the slit is installed inside the assembly cavity (12). The cold-sensitive actuator can control the lifting component (11) to pass through the slit under a preset low-temperature environment.

2. The rooftop flat-plate solar collector according to claim 1, characterized in that: The cold-sensitive actuator includes an assembly base (13) fixedly installed inside the assembly cavity (12). The assembly base (13) has two side seats, and a bimetallic strip (14) is installed between the two side seats. The bimetallic strip (14) includes a passive layer and an active layer with upper and lower double layers that are pre-compressed and shaped. The expansion coefficient of the active layer is greater than that of the passive layer. The bimetallic strip (14) will be pre-compressed to a concave state at high temperature. The bimetallic strip (14) will jump to a convex state at the center after encountering a preset cold change temperature. The concave area of ​​the center of the bimetallic strip (14) abuts against the bottom of the functional lifting component (11).

3. The rooftop flat-plate solar collector according to claim 2, characterized in that: The mounting base (13) also has a top layer, on which a guide channel is provided. A linkage column (15) is slidably installed in the guide channel. The bottom end of the linkage column (15) abuts against the central recessed area of ​​the bimetallic sheet (14), and the bottom of the functional lifting component (11) is fixedly connected to the top of the linkage column (15).

4. The rooftop flat-plate solar collector according to claim 2, characterized in that: The top of the functional lifting component (11) is designed with multiple sharp serrations. The sharp serrations are located in the slit. The inner wall of the slit is fitted with a rubber partition strip (9) that fits tightly against the functional lifting component (11) and the sharp serrations. The rubber partition strip (9) and the functional lifting component (11) together seal the slit.

5. The rooftop flat-plate solar collector according to claim 2, characterized in that: The active layer is made of CuZn36 and placed in the lower layer, and the passive layer is made of FeNi36 and placed in the upper layer. Under the condition of 60-80℃ higher than the working temperature, the bimetallic sheet (14) is forcibly pressed into a pre-stable state with a concave center and fixed by the outer ring limiting method.

6. The rooftop flat-plate solar collector according to claim 4, characterized in that: The thickness of the multiple third tempered glass (7) increases sequentially in equal amounts according to the arrangement order, forming a stepped state. When the outer frame (1) and the heat absorption plate (2) are installed at an angle, the thickness of the third tempered glass (7) located at the higher position is greater than the thickness of the third tempered glass (7) located at the lower position.

7. The rooftop flat-plate solar collector according to claim 6, characterized in that: The surfaces of the multiple third tempered glass (7) are designed with periodic and micron-sized oriented microgrooves, and the oriented microgrooves are parallel to the tilt direction of the heat absorber plate (2).

8. The rooftop flat-plate solar collector according to any one of claims 1-7, characterized in that: The outer frame (1) has a narrow edge design, and the thickness of the outer frame (1) in the direction of the heat absorption surface of the heat absorption plate (2) is lower than the thickness of the third tempered glass (7). The isolation horizontal frame (8) also includes an isolation vertical frame (16) that surrounds the outside of multiple third tempered glass (7) and fits tightly. The isolation vertical frame (16) and the isolation horizontal frame (8) are integrally formed and constitute an assembly frame.

9. The rooftop flat-plate solar collector according to claim 8, characterized in that: The heat absorption plate (2) is filled with a heat insulation layer (5) between its circumferential periphery and the inner wall of the outer frame (1). A rotating channel is provided inside the heat absorption plate (2). The beginning and end of the rotating channel penetrate the outer wall of the heat absorption plate (2). A working fluid pipe (3) is installed in the rotating channel, and the beginning and end of the working fluid pipe (3) are connected to an external working fluid heat exchange device.

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