A heat absorbing plate core of a flat plate collector and a flat plate collector

Abstract

The invention discloses a heat absorbing plate core of a flat plate heat collector and a flat plate heat collector, comprising an outer shell, a heat conducting plate and a symmetrically arranged header are respectively arranged between a lower heat insulation layer and a transparent cover plate, a row pipe is arranged between the headers, an upper heat insulation layer and a heat insulating sandwich plate are arranged in sequence on the upper end of the heat conducting plate, a polygonal heat absorbing cover is arranged on the upper end surface of the heat insulating sandwich plate, a heat conducting lining body is arranged on the inner wall of the polygonal heat absorbing cover, heat absorbing plates are arranged through both side walls of the polygonal heat absorbing cover, a light reflecting block is arranged on the upper end surface of the heat insulating sandwich plate, and a transparent heat insulating plate is symmetrically arranged between the bottom end surface of the transparent cover plate and the top of the light reflecting block. The heat absorbing area is increased by arranging the polygonal heat absorbing cover, the heat absorbing plate and the light reflecting block, and the loss of absorbed heat is reduced by the coordinated arrangement of the heat insulating sandwich plate, the light reflecting block and the transparent heat insulating plate, and the heat conducting effect of absorbing heat is improved by the coordinated arrangement of the heat conducting lining body, the heat conducting silicone grease layer, the heat conducting plate and the upper heat insulating layer.

Description

Technical Field

[0001] The invention belongs to the technical field of flat plate collector application, and in particular relates to a heat absorbing plate core of a flat plate collector and a flat plate collector. Background Art

[0002] A flat-plate solar collector is a device that absorbs solar radiation energy and transfers heat to a working medium. It is a special heat exchanger. The working medium in the collector exchanges heat with the distant sun. A flat-plate solar collector is composed of a heat-absorbing plate core, a shell, a transparent cover, insulation materials and related parts. After adding a circulating pipe and an insulation water tank, it can absorb solar radiation heat and increase the water temperature. The heat-absorbing element of a flat-plate solar collector is a metal heat-absorbing plate with a solar selective absorption coating on its surface. The middle of the heat-absorbing plate is a medium flow channel. A collector is composed of several heat-absorbing plates and upper and lower heat-collecting tubes welded together, with a metal outer frame shell and back insulation materials. The transparent cover on the top can be glass with high light transmittance. Sunlight shines through the transparent cover onto the heat-absorbing body with an absorption layer on the surface. Most of the solar radiation energy is absorbed by the absorber, converted into heat energy, and transmitted to the working fluid in the fluid channel. In this way, the cold working fluid from the bottom entrance of the collector is heated by the solar energy in the fluid channel, and the temperature gradually increases. The heated hot working fluid, with useful heat energy, exits from the upper end of the collector and is stored in the water tank for standby use, which is the useful energy gain. On the flat-plate absorbing plate, usually there are row pipes and headers, which need to be fixed on the absorbing plate by welding. The row pipe refers to the component of the absorbing plate arranged longitudinally and forming the fluid channel; the header refers to the component of the upper and lower ends of the absorbing plate that horizontally connects several row pipes to form the fluid channel. There are many kinds of materials for the absorbing plate, including copper, aluminum alloy, copper-aluminum composite, stainless steel, galvanized steel, plastic, rubber, etc.

[0003] For example, the Chinese patent with the announcement number CN102410650A discloses a heat absorbing plate core device of a flat solar collector, which is composed of a heat absorbing plate core and a heat conducting pipe. Flow channels are arranged at both ends of the heat absorbing plate core, and the heat conducting pipes are respectively connected to the flow channels at both ends. Heat conducting holes are arranged in the heat conducting pipes. The heat absorbing plate core is made of aluminum, and the heat conducting pipes are made of aluminum. A mounting surface is arranged below the heat conducting pipes, and the mounting surface is fixedly connected to the heat absorbing plate core. The aluminum heat conducting pipe can reduce the cost of materials and improve the heat transfer and heat absorption effects. The setting of the mounting surface can increase the contact area between the heat conducting pipe and the heat absorbing plate core, increase the heated area of ​​the heat conducting pipe, further improve the heat conduction rate, increase the heat collection rate, improve the thermal efficiency, and effectively reduce the heat dissipation loss during the heat conduction process. It is also convenient for fixing and increases the fixing area. Make the connection more firm.

[0004] However, the above scheme has the following shortcomings: in the above patent document, the heat exchange area between the heat pipe and the heat absorbing plate core is increased by integrating the mounting surface and the heat conducting pipe, but the heat absorption area of ​​the heat absorbing plate core is still quite different from the heat exchange area of ​​the heat conducting pipe, so that most of the heat absorbed by the heat absorbing plate core that is not in contact with the heat conducting pipe will be lost. The heat absorbing plate core has good heat absorption performance and good heat dissipation function. Usually, the flat plate collector is installed in the ventilated place of the roof of the building. External factors such as ambient wind will accelerate the dissipation of the heat collected on the heat absorbing plate core, resulting in the heat loss of the heat absorbing plate core changing with the surrounding environmental factors. In addition, the existing heat absorbing plate core is usually a simple plate structure. Under the condition that the volume of the heat absorbing plate core is constant, how to increase the heat absorption area and heat conduction effect of the heat absorbing plate core is a problem that needs to be solved at present.

[0005] To this end, we propose a heat absorbing plate core of a flat plate collector and a flat plate collector to solve the problems mentioned in the above background technology. Summary of the invention

[0006] The object of the present invention is to provide a heat absorbing plate core of a flat plate collector and a flat plate collector to solve the problems existing in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A heat absorbing plate core of a flat plate collector comprises an outer shell and a back plate, a lower thermal insulation layer and a transparent cover plate arranged therein in sequence, a heat conducting plate and a collecting pipe symmetrically arranged are respectively arranged between the lower thermal insulation layer and the transparent cover plate from top to bottom, a plurality of row pipes are arranged in communication between the collecting pipes, an upper thermal insulation layer and a heat insulating sandwich plate are arranged in sequence on the upper end of the heat conducting plate, a plurality of polygonal heat absorbing covers are arranged on the upper end surface of the heat insulating sandwich plate, a heat conductive lining body is arranged on the inner wall of the polygonal heat absorbing cover, an upper portion of the row pipe is arranged in the polygonal heat absorbing cover, heat absorbing plates are arranged through both side walls of the polygonal heat absorbing cover, a light reflecting block is arranged on the upper end surface of the heat insulating sandwich plate between the polygonal heat absorbing covers, and a transparent heat insulating plate is symmetrically arranged between the bottom end surface of the transparent cover plate and the top of the light reflecting block.

[0009] Preferably, the heat conducting plate and the heat insulating sandwich plate are respectively provided with a main mounting port and a secondary mounting port, the row pipes are passed through the main mounting port and the secondary mounting port in sequence, the bottom end surface of the polygonal heat absorbing cover is symmetrically provided with mounting grooves, and mounting screws are symmetrically arranged in the mounting grooves, the mounting screws are passed through the heat insulating sandwich plate and the heat conducting plate in sequence, and the protruding ends of the mounting screws are locked by nuts.

[0010] Preferably, the upper part of the row pipe is in contact with the thermally conductive lining, and the gap between the row pipe and the thermally conductive lining is filled with a thermally conductive silicone grease layer. Elastic leak-proof blocks are symmetrically arranged at the open bottom of the thermally conductive lining, and the elastic leak-proof blocks can be in sealing contact with the side surface of the row pipe.

[0011] Preferably, the outer surfaces of the polygonal heat absorbing cover and the heat absorbing plate are both provided with a heat absorbing coating, the inner end of the heat absorbing plate is arranged on the heat conductive lining, and the thermal conductivity coefficient of the polygonal heat absorbing cover and the heat absorbing plate is smaller than that of the heat conductive lining, and the two side walls of the light reflecting block are both provided with reflective lenses.

[0012] Preferably, the reflective lens can reflect sunlight to the backlight side of the polygonal heat absorbing cover and the heat absorbing plate, and the light reflecting block is made of heat insulating material, the transparent heat insulating plates are filled with inert gas, and a flexible transparent sealing cloth is arranged between the lower part of the transparent heat insulating plate and the top of the light reflecting block.

[0013] The upper end surface of the light reflecting block is symmetrically provided with a spring slide groove, in which a buffer rod is slidably connected. The spring slide groove is composed of a slide groove and a buffer spring arranged therein. The top of the buffer rod is fixedly arranged on the bottom end surface of the transparent cover plate, and the buffer rod is located between the transparent insulation plates. The transparent cover plate and the outer shell are elastically sealed.

[0014] A flat plate heat collector comprises a heat absorbing plate core of the flat plate heat collector.

[0015] Compared with the prior art, the beneficial effects of the present invention are: under the condition that the volume of the outer shell is constant, the heat absorption area is increased by arranging the polygonal heat absorption cover, the heat absorption plate and the light reflection block, and the loss of absorbed heat is reduced by the coordinated arrangement of the insulating interlayer plate, the light reflection block and the transparent insulation plate, and the thermal conductivity effect of the absorbed heat is improved by the coordinated arrangement of the thermal conductive lining body, the thermal conductive silicone grease layer, the thermal conductive plate and the upper insulation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0017] Figure 2 for Figure 1 A partial schematic diagram of

[0018] Figure 3 for Figure 2 A partial schematic diagram of the multi-sided heat absorbing cover area;

[0019] Figure 4 It is a cross-sectional schematic diagram of the matching area of ​​the heat conducting plate, the header, the row pipe, the upper insulation layer, the heat insulating sandwich plate, the multi-sided heat absorbing cover, the heat conducting lining body and the heat absorbing plate of the present invention;

[0020] Figure 5 for Figure 4 A local schematic diagram of the thermally conductive lining area.

[0021] In the figure: 1. outer shell; 2. back plate; 3. lower insulation layer; 4. transparent cover plate; 5. heat conduction plate; 6. header; 7. row pipe; 8. upper insulation layer; 9. thermal insulation sandwich plate; 10. multi-sided heat absorption cover; 11. thermal conductive lining body; 12. heat absorption plate; 13. light reflection block; 14. transparent insulation board; 15. main installation port; 16. auxiliary installation port; 17. installation slot; 18. installation screw; 19. thermal grease layer; 20. elastic leak-proof block; 21. heat absorption coating; 22. reflective lens; 23. spring slide slot; 24. buffer rod; 101. flexible transparent sealing cloth. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] See also Figure 1-5 , the present invention provides a technical solution: Example

[0024] A heat absorbing plate core of a flat plate collector comprises an outer shell 1 and a back plate 2, a lower insulation layer 3 and a transparent cover plate 4 arranged therein in sequence. The lower insulation layer 3 is a conventional component of a flat plate collector in the prior art, and glass wool can usually be selected for insulation. The transparent cover plate 4 can be selected from transparent tempered glass. A heat conducting plate 5 and a header 6 are symmetrically arranged from top to bottom between the lower insulation layer 3 and the transparent cover plate 4. The two headers 6 are respectively used as channels for the inflow or outflow of the working medium of the flat plate collector. The heat conducting plate 5 and the transparent cover plate 4 are symmetrically arranged from top to bottom. The two headers 6 are respectively used as channels for the inflow or outflow of the working medium of the flat plate collector. The plate 5 can be made of a metal aluminum plate with good thermal conductivity. Nine row pipes 7 are arranged between the headers 6. The number of the row pipes 7 is adaptively adjusted according to the specifications of the outer shell 1. The upper end of the heat-conducting plate 5 is sequentially bonded with an upper insulation layer 8 and an insulating sandwich plate 9. The upper insulation layer 8 can also be made of a material with thermal insulation function such as glass wool. The upper insulation layer 8 and the lower insulation layer 3 can wrap the header 6 from top to bottom, which can reduce the heat loss of the header 6. Nine polygonal heat absorption covers 10 are arranged on the upper end surface of the insulating sandwich plate 9. Figure 4As shown, the cross-section of the polygonal heat absorption cover 10 can be an isosceles trapezoidal structure with a wider heat absorption area. The inner wall of the polygonal heat absorption cover 10 is bonded with a heat-conductive lining 11. The upper part of the row pipe 7 is arranged in the polygonal heat absorption cover 10, and the inner surface of the heat-conductive lining 11 and the insertion part of the row pipe 7 have an arc-shaped area with the same curvature, thereby increasing the heat transfer area of ​​the heat-conductive lining 11 to the row pipe 7. The heat absorbed by the polygonal heat absorption cover 10 can be transferred to the row pipe 7 through the heat-conductive lining 11, so that the row pipe 7 has a wider heat absorption area. Heat absorbing plates 12 are arranged on both side walls of the polygonal heat absorption cover 10. Both the polygonal heat absorption cover 10 and the heat absorbing plates 12 are made of aluminum with good thermal conductivity. The number of heat absorbing plates 12 can be adaptively adjusted according to the indirectness of adjacent polygonal heat absorption covers 10. In this embodiment, the single-sided heat absorption cover 10 There are two heat plates 12. The heat absorbing plates 12 can increase the heat absorbing area on both sides of the multilateral heat absorbing cover 10. The upper end surface of the heat insulating sandwich plate 9 is located between the multilateral heat absorbing cover 10 and is provided with a light reflecting block 13. The light reflecting block 13 can reflect the incoming sunlight onto the multilateral heat absorbing cover 10 and the heat absorbing plate 12, thereby increasing the amount of heat absorbed by the multilateral heat absorbing cover 10. Transparent heat insulating plates 14 are symmetrically arranged between the bottom end surface of the transparent cover plate 4 and the top of the light reflecting block 13. The transparent heat insulating plates 14 can separate adjacent multilateral heat absorbing covers 10, thereby reducing the loss in the heat transfer process between adjacent multilateral heat absorbing covers 10. The transparent heat insulating plates 14 are made of transparent glass, which is a mature product of the prior art, and only relevant glass with transparent heat insulation function is required. Example

[0025] On the basis of the first embodiment, the heat conducting plate 5, the heat insulating sandwich plate 9 and the heat conducting lining body 11 are further described. The heat conducting plate 5 and the heat insulating sandwich plate 9 are respectively provided with a main mounting port 15 and a secondary mounting port 16. The pipe 7 passes through the main mounting port 15 and the secondary mounting port 16 in sequence. The bottom end surface of the multilateral heat absorbing cover 10 is symmetrically provided with a mounting groove 17. The mounting groove 17 is symmetrically and detachably provided with a mounting screw 18. The mounting groove 17 is pre-injected with a sealant. The sealant can seal the gap between the bottom of the multilateral heat absorbing cover 10 and the contact portion of the heat insulating sandwich plate 9. The mounting screw 18 passes through the heat insulating sandwich plate 9 and the heat conducting plate 5 and the upper insulation layer 8 in sequence, and the mounting screw 18 extends out of the end By locking with nuts, the above-mentioned arrangement can facilitate the installation and disassembly of the multilateral heat absorption cover 10, and is convenient for selectively installing the multilateral heat absorption cover 10 according to different specifications of the row pipe 7. The upper part of the row pipe 7 is in contact and connected with the thermally conductive lining body 11, and the gap between the row pipe 7 and the thermally conductive lining body 11 is filled with a thermally conductive silicone grease layer 19. The thermally conductive silicone grease layer 19 can improve the thermal conductivity between the row pipe 7 and the thermally conductive lining body 11. Elastic leak-proof blocks 20 are symmetrically bonded to the open bottom of the thermally conductive lining body 11. The elastic leak-proof blocks 20 can be composed of elastic rubber blocks. The elastic leak-proof blocks 20 can be in sealing contact with the side surface of the row pipe 7, thereby preventing the thermally conductive silicone grease layer 19 from flowing out from the open end at the bottom of the thermally conductive lining body 11. Example

[0026] Based on the first embodiment, the multi-sided heat absorbing cover 10 and the light reflecting block 13 are further described. The outer surfaces of the multi-sided heat absorbing cover 10 and the heat absorbing plate 12 are provided with a heat absorbing coating 21. The heat absorbing coating 21 plays a very important role in absorbing solar radiation energy. Because the wavelength of solar radiation is mainly concentrated in the range of 0.3 to 2.5 μm, in order to enhance the absorption capacity of the multi-sided heat absorbing cover 10 and the heat absorbing plate 12 to solar radiation and reduce heat loss, it is necessary to select a coating with a high absorption rate for solar short-wave radiation and a low emissivity for long-wave thermal radiation. The heat absorbing coating 21 can be classified into: electroplating coating, chemical surface conversion coating, vacuum plating coating, wherein the electroplating coating can be a black chrome coating, and the absorption ratio α and the emission ratio ε of the black chrome coating are 0.93 to 0.97 and 0.07 to 0.07, respectively.15, α / ε is 6-13, it has excellent spectral selectivity, the thermal stability and high temperature resistance of the black chrome coating are also very good, it is suitable for high temperature conditions, and can work stably for a long time at 300°C. In addition, the black chrome coating also has good weather resistance and corrosion resistance; therefore, the heat absorption coating 21 in this embodiment can be selected from a black chrome coating, and the inner end of the heat absorption plate 12 is fixed to the heat conductive lining body 11 by a heat-resistant adhesive, so that the heat absorption plate 12 and the heat conductive lining body 11 are detachably arranged, and the thermal conductivity of the polygonal heat absorption cover 10 and the heat absorption plate 12 is less than that of the heat conductive lining body 11, and the heat conductive lining body 11 can be selected from a copper material with a large thermal conductivity. It can be seen from the first embodiment that the polygonal The heat absorbing cover 10 and the heat absorbing plate 12 are made of aluminum, so the heat conductive lining body 11 has a more excellent thermal conductivity, so that the heat conductive lining body 11 can quickly transfer the heat absorbed by the multilateral heat absorbing cover 10 and the heat absorbing plate 12 to the row pipe 7, and the two side walls of the light reflecting block 13 are provided with reflecting lenses 22, which can reflect sunlight to the backlight side of the multilateral heat absorbing cover 10 and the heat absorbing plate 12, thereby increasing the heat absorption area of ​​the multilateral heat absorbing cover 10 and the heat absorbing plate 12, and the light reflecting block 13 is made of a heat insulating material, and the light reflecting block 13 can specifically select a ceramic fiberboard. The transparent heat insulating plate 14 is filled with an inert gas, and the setting of the inert gas further improves the transparent The heat insulation performance between the heat insulation boards 14 is improved. A flexible transparent sealing cloth 101 is arranged between the lower part of the transparent heat insulation board 14 and the top of the light reflection block 13. The flexible transparent sealing cloth 101 can be made of transparent flexible PVC material. The flexible transparent sealing cloth 101 can be arranged to make the volume between the transparent heat insulation boards 14 adaptively adjusted. The upper end surface of the light reflection block 13 is symmetrically provided with a spring slide 23, and a buffer rod 24 is slidably connected in the spring slide 23. The spring slide 23 is composed of a slide and a buffer spring arranged therein. The top of the buffer rod 24 is fixedly arranged with the bottom end surface of the transparent cover plate 4, and the buffer rod 24 is located between the transparent heat insulation boards 14. The buffer rod 2 The bottom end of the transparent cover 4 is fixedly connected to the top of the buffer spring, and the transparent cover 4 is elastically sealed to the outer shell 1. The transparent cover 4 and the outer shell 1 are fixed by a clamping method, and the clamping point can swing vertically within a range of one centimeter. A rubber pad can be inserted between the connection part of the transparent cover 4 and the outer shell 1. The contact part of the transparent cover 4 and the outer shell 1 is contact-sealed by a rubber sealing ring. The setting of the rubber pad can make the transparent cover 4 elastically displaced when it is impacted by the outside world. The buffer rod 24 can be pushed by the transparent cover 4. The buffer rod 24 quickly buffers under the cooperation of the spring slide groove 23, and has a good collision buffering effect. .

[0027] The working principle is as follows: in the process of using the flat plate collector, a polygonal heat absorbing cover 10 or a heat-conducting lining 11 of suitable specifications can be selected for installation according to the size of the row pipe 7. The heat-conducting lining 11 can be bonded and fixed to the inner wall of the polygonal heat absorbing cover 10 by bonding, and the mounting screw 18 at the bottom end of the polygonal heat absorbing cover 10 is passed through the auxiliary mounting port 16 and the main mounting port 15 in turn. The protruding end of the mounting screw 18 is locked and fixed by a nut, which is convenient and quick to install. After that, a heat-conducting coating is applied to the inner wall of the heat-conducting lining 11. The silicone grease layer 19 is used to fix the working part of the manifold 6 to the bottom end surface of the heat conducting plate 5 by spot welding, and the free end of the manifold 6 is fixed to the outer shell 1 by welding. The row pipes 7 welded and fixed on the manifold 6 are inserted into the inner arc surface end of the heat conducting lining body 11 through the main installation opening 15 and the auxiliary installation opening 16 in sequence, so that the manifold 6 is wrapped by the lower insulation layer 3 and the upper insulation layer 8. The above arrangement only requires welding between the manifold 6 and the heat conducting plate 5, and there is no need to weld the row pipes 7 separately, thereby improving the installation efficiency;

[0028] In the process of daily use, if there is hail in the external environment, the impact on the transparent cover plate 4 will be transmitted to the buffer rod 24, and the swing of the buffer rod 24 in the spring slide groove 23 can buffer the impact on the transparent cover plate 4, thereby improving the stability of the flat plate collector during use;

[0029] The sunlight passes through the transparent cover plate 4 and falls onto the top of the polygonal heat absorbing cover 10 and the heat absorbing plate 12. The heat absorbing coating 21 on the outer surface of the polygonal heat absorbing cover 10 and the heat absorbing plate 12 improves the heat absorption effect. At the same time, under the action of the reflective lens 22, the projected sunlight can be reflected to the backlight part of the polygonal heat absorbing cover 10 and the heat conductive lining body 11, thereby increasing the heat absorption area. Under the cooperation of the light reflecting block 13 and the symmetrically arranged transparent heat insulating plate 14, the heat transfer loss between adjacent polygonal heat absorbing covers 10 is reduced. The polygonal heat absorbing cover 10 and the heat absorbing plate 12 transfer the absorbed heat to the row pipe 7 through the heat conductive lining body 11 and the heat conductive silicone grease layer 19 in turn. The design of the inner surface of the heat conductive lining body 11 fitting with the outer surface of the row pipe 7 can increase the heat exchange area. Under the guidance of the two headers 6, the working medium The mass flows in the drain pipe 7, and the working medium circulating in the drain pipe 7 absorbs the transferred heat. The coordinated setting of the upper insulation layer 8 and the lower insulation layer 3 reduces the loss of the above-mentioned absorbed heat, and the setting of the heat conducting plate 5 can temporarily store the transferred heat, increase the temperature of the area between the lower insulation layer 3 and the upper insulation layer 8, and further reduce the heat loss. When the volume of the outer shell 1 is constant, the heat absorption area is increased by the setting of the polygonal heat absorption cover 10, the heat absorption plate 12 and the light reflection block 13, and the loss of absorbed heat is reduced by the coordinated setting of the insulating interlayer plate 9, the light reflection block 13 and the transparent insulation board 14, and the heat conduction effect of absorbing heat is improved by the coordinated setting of the heat conducting lining body 11, the heat conducting silicone grease layer 19, the heat conducting plate 5 and the upper insulation layer 8.

[0030] This embodiment provides a flat plate collector, including the heat absorbing plate core of the flat plate collector provided in the first embodiment.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat absorbing plate core of a flat plate collector, comprising an outer shell (1) and a back plate (2), a lower insulation layer (3), and a transparent cover plate (4) arranged therein in sequence, characterized in that: A heat conducting plate (5) and a header (6) are arranged symmetrically from top to bottom between the lower thermal insulation layer (3) and the transparent cover plate (4); a plurality of row pipes (7) are arranged in communication between the headers (6); an upper thermal insulation layer (8) and a heat insulating sandwich plate (9) are arranged in sequence at the upper end of the heat conducting plate (5); a plurality of polygonal heat absorbing covers (10) are arranged on the upper end surface of the heat insulating sandwich plate (9); the cross section of the polygonal heat absorbing covers (10) is an isosceles trapezoidal structure; a heat conducting lining body (11) is arranged on the inner wall of the polygonal heat absorbing covers (10); the inner surface of the heat conducting lining body (11) is in contact with the insertion portion of the row pipes (7); The arc-shaped areas have the same arc angle, thereby increasing the heat transfer area of ​​the heat-conducting lining body (11) to the row pipe (7); the upper part of the row pipe (7) is arranged in a polygonal heat-absorbing cover (10); heat-absorbing plates (12) are arranged through both side walls of the polygonal heat-absorbing cover (10); the polygonal heat-absorbing cover (10) and the heat-absorbing plates (12) are both made of aluminum with good thermal conductivity; the upper end surface of the heat-insulating sandwich plate (9) is located between the polygonal heat-absorbing cover (10); and transparent heat-insulating plates (14) are symmetrically arranged between the bottom end surface of the transparent cover plate (4) and the top of the light-reflecting block (13); The light reflection block (13) can reflect incoming sunlight onto the polygonal heat absorption cover (10) and the heat absorption plate (12), thereby increasing the heat absorption capacity of the polygonal heat absorption cover (10); The upper end surface of the light reflection block (13) is symmetrically provided with a spring slide groove (23), a buffer rod (24) is slidably connected in the spring slide groove (23), the spring slide groove (23) is composed of a slide groove and a buffer spring arranged therein, the top of the buffer rod (24) is fixedly arranged with the bottom end surface of the transparent cover plate (4), and the buffer rod (24) is located between the transparent heat insulation plate (14), and the transparent cover plate (4) and the outer shell (1) are elastically sealed.

2. The heat absorbing plate core of a flat plate collector according to claim 1, characterized in that: The heat conducting plate (5) and the heat insulating sandwich plate (9) are respectively provided with a main mounting opening (15) and a secondary mounting opening (16); the row pipes (7) are passed through the main mounting opening (15) and the secondary mounting opening (16) in sequence; the bottom end surface of the polygonal heat absorbing cover (10) is symmetrically provided with mounting grooves (17); mounting screws (18) are symmetrically arranged in the mounting grooves (17); the mounting screws (18) are passed through the heat insulating sandwich plate (9) and the heat conducting plate (5) in sequence, and the protruding ends of the mounting screws (18) are locked by nuts.

3. The heat absorbing plate core of a flat plate collector according to claim 1, characterized in that: The upper part of the row pipe (7) is in contact with and connected to the heat-conducting lining body (11), and the gap between the row pipe (7) and the heat-conducting lining body (11) is filled with a heat-conducting silicone grease layer (19), and elastic leak-proof blocks (20) are symmetrically arranged at the bottom opening of the heat-conducting lining body (11), and the elastic leak-proof blocks (20) are in sealing contact with the side surface of the row pipe (7).

4. The heat absorbing plate core of a flat plate collector according to claim 1, characterized in that: The outer surfaces of the polygonal heat absorbing cover (10) and the heat absorbing plate (12) are both provided with a heat absorbing coating (21); the inner end of the heat absorbing plate (12) is provided on the heat conductive lining (11); the thermal conductivity of the polygonal heat absorbing cover (10) and the heat absorbing plate (12) is smaller than that of the heat conductive lining (11); and the two side walls of the light reflecting block (13) are both provided with reflecting lenses (22).

5. The heat absorbing plate core of the flat plate collector according to claim 4, characterized in that: The reflective lens (22) is capable of reflecting sunlight to the backlight side of the multi-sided heat absorbing cover (10) and the heat absorbing plate (12), and the light reflecting block (13) is made of a heat insulating material. The transparent heat insulating plates (14) are filled with an inert gas, and a flexible transparent sealing cloth (101) is provided between the lower part of the transparent heat insulating plate (14) and the top of the light reflecting block (13).

6. A flat plate collector, characterized in that: The flat-plate collector comprises the heat absorbing plate core of the flat-plate collector according to any one of claims 1 to 5.

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