Flat-plate solar collector

Abstract

The invention provides a flat-plate solar collector which is low in manufacturing and mounting cost. The heat exchanger comprises a heat exchange core, the heat exchange core comprises two collecting pipes, a plurality of sets of micro-channel flat pipes and corresponding horizontal convex connectors, convex connecting ports are formed in the two ends, in the length direction, of the collecting pipes respectively, the multiple sets of micro-channel flat pipes are arranged in parallel at intervals, and the two ends of the micro-channel flat pipes are converged and inserted into the corresponding collecting pipes respectively; two ends of each group of collecting pipes in the length direction are respectively sleeved with a horizontal convex joint; a transparent cover plate; and the shell comprises a peripheral surrounding plate and a back plate.

Description

Technical Field

[0001] The present invention relates to the technical field of solar heat collection, in particular to a flat-plate solar heat collector. Background Art

[0002] The existing structure for solar flat plate collectors is shown in Figure 1 It includes a heat exchange core 1, a transparent cover plate 2, an insulator 3, and a shell 4. In the actual structure, the shell 4 includes four surrounding panels and a bottom plate. The heat exchange body 1 includes two manifolds and a heat exchange component. The existing heat exchange components are tube-sheet type, wing-tube type, flat box type, radiator type, flat heat pipe type, etc. The heat exchange component is a heat exchange flow channel welded on the back of a metal heat absorbing plate, or two metal plates are welded and assembled to form a flow channel. The metal heat absorbing plate or metal welding plate basically adopts a copper tube plate core. The copper tube plate core is heavy and the cost of using the copper tube plate core is high. The welding method is used, the weld is easy to crack, and the molding process is complicated. Therefore, it is urgent to develop a flat-plate solar collector with low production and installation costs. Summary of the Invention

[0003] In view of the above problems, the present invention provides a flat-plate solar collector with low manufacturing and installation costs.

[0004] A flat-plate solar thermal collector, characterized in that it comprises:

[0005] The heat exchange core includes two manifolds, several groups of microchannel flat tubes, and corresponding horizontal convex joints. The manifolds are provided with convex connection interfaces at both ends in the longitudinal direction. The several groups of microchannel flat tubes are arranged in parallel and spaced apart, and the two ends are respectively connected to the corresponding manifolds. Each group of manifolds is provided with horizontal convex joints at both ends in the longitudinal direction.

[0006] Transparent cover;

[0007] and a housing comprising surrounding panels and a back panel;

[0008] The transparent cover is installed on the upper layer of the heat exchange core, a heat-absorbing coating is provided between the transparent cover and the upper surface of the heat exchange core, a back plate is provided on the lower surface of the heat exchange core, and a heat-insulating layer is provided between the back plate and the lower surface of the heat exchange core;

[0009] The two groups of connection interfaces of one collecting pipe are two groups of inlets, and the two groups of connection interfaces of the other collecting pipe are two groups of outlets. The two groups of collecting pipes are combined to form two inlet and two outlet interfaces, which ensures the uniformity of the flow distribution of the cooling medium.

[0010] It is further characterized by:

[0011] Each group of manifolds includes a tube body, a central flow channel cavity is provided in the center of the tube body, and a plurality of manifold insertion slots are sequentially provided on the inner ring wall of the tube body along the length direction, and each group of manifold insertion slots is connected to the central flow channel cavity;

[0012] Each group of microchannel flat tubes includes a metal plate body, which includes an outer contour edge extending in the length direction and a plurality of independent microchannels arranged in sequence in the width direction. Adjacent microchannels are separated by vertical plates. End connectors for docking with the manifold insertion slots are provided at both ends of the length direction of each group of microchannel flat tubes.

[0013] Several groups of microchannel flat tubes are arranged in parallel and spaced apart along a plane to form a flat plate area. Two groups of manifolds are respectively arranged on both sides of the flat plate area. The end connectors of each group of microchannel flat tubes are inserted into the manifold insertion slots at corresponding lengthwise positions of the manifolds on the corresponding side.

[0014] The manifold is specifically a round tube, and the horizontal convex joint is a round tube quick joint. The round tube quick joint includes a sleeve docking inlet and a sleeve docking outlet. The sleeve docking inlet of the round tube quick joint is inserted into the connection interface of the round tube, which makes docking fast and reliable and reduces assembly time. The sleeve docking outlet is reasonably arranged according to the size of the external pipe to ensure rapid adaptation to the external pipe.

[0015] The heat absorbing coating is specifically a metal-based heat absorbing coating, a novel nano-coating, an organic silicon heat absorbing coating or a ceramic-based heat absorbing coating;

[0016] A temperature sensor interface is provided at the water outlet of the manifold, which is convenient for installing the temperature sensor to detect and control the temperature at the water outlet;

[0017] An exhaust device is provided at the water outlet connected to the manifold to release the air pockets generated inside the system and improve the heat exchange efficiency of the system.

[0018] The filling material of the thermal insulation layer is at least one of expanded polypropylene (EPP), polyurethane foam (EPU), polystyrene foam (EPS) or polyethylene foam (EPE). The filling material of the thermal insulation layer plays a role in thermal insulation, preventing heat loss and improving thermal efficiency.

[0019] The end fitting of the microchannel flat tube includes an arc-shaped upward guide portion and a horizontal plug-in end fitting. An independent microchannel is synchronously provided in the inner cavity of the end fitting. The arc-shaped upward guide portion through which the end fitting passes is formed by bending the sheet metal, which does not affect the arrangement of the microchannel. Since the height of the header insertion slot of the manifold is relatively higher than that of the microchannel flat tube in a flat state, the horizontal plug-in end fitting of an adapted height is obtained by bending the two ends of the length direction of the flat plate corresponding to the microchannel flat tube, thereby ensuring that the bottoms of the microchannel flat tube and the manifold are at the same plane height, thereby adapting to the installation backplane.

[0020] The microchannel flat tube is a thin-walled porous flat tube made of refined aluminum rods through hot extrusion and surface zinc spraying anti-corrosion treatment. The density of aluminum is 2.7g / cm 3 Aluminum has a lower density. By utilizing this property of aluminum, the high-efficiency flat-plate collector product is lighter in weight and bears less ground / roof load during installation.

[0021] After adopting the present invention, the heat exchange core is formed by combining two groups of manifolds and a plurality of microchannel flat tubes, wherein the microchannel flat tubes are obtained by manufacturing and processing light metals, and the manufacturing of each group of microchannel flat tubes does not require welding, which reduces the manufacturing cost, and multiple groups of microchannels are sequentially arranged in each group of microchannel flat tubes to form a flow channel, thereby increasing the heat exchange area; in addition, since the two groups of manifolds are combined to form two inlet and two outlet interfaces, the uniformity of the flow distribution of the cooling medium is ensured; in summary, the flat-plate solar collector can ensure uniform and reliable heat exchange within the flat plate area, and the manufacturing and installation costs are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional schematic diagram of an existing flat-plate solar collector;

[0023] Figure 2 A schematic diagram of the cross-sectional structure of the main view of the present invention;

[0024] Figure 3 It is a schematic diagram of the top view of the heat exchange core of the present invention;

[0025] Figure 4 Schematic diagram of the side cross-sectional structure of the heat exchange core of the present invention;

[0026] Figure 5 This is a schematic diagram of the assembly of a round tube quick connector of the present invention;

[0027] Figure 6 for Figure 4 A partial enlarged schematic diagram of point A

[0028] Figure 7 is a side view of the header of the present invention;

[0029] The names corresponding to the serial numbers in the figure are as follows:

[0030] Heat exchange core 100, transparent cover 200, insulation layer 300, shell 400, surrounding panels 401, back panel 402, heat absorbing coating 500;

[0031] Collecting pipe 10, pipe body 11, collecting pipe insertion groove 12, connection interface 13, central flow channel cavity 14, microchannel flat tube 20, metal plate body 21, outer contour edge 22, microchannel 23, vertical plate 24, end joint 25, guide part 251, horizontal insertion end joint 252, flat plate area 30, round tube quick connector 40, sleeve docking inlet 41, sleeve docking outlet 42. DETAILED DESCRIPTION

[0032] A flat-plate solar collector, see Figure 2-Figure 7 , which includes a heat exchange core 100, a transparent cover plate 200, a heat insulation layer 300, and a shell 400;

[0033] The heat exchange core 100 includes two headers 10, several groups of microchannel flat tubes 20, and corresponding horizontal convex joints 40. The headers 10 are provided with convex connection interfaces 13 at both ends of the length direction. The several groups of microchannel flat tubes 20 are arranged in parallel and spaced apart, and the ends are respectively connected to the corresponding headers 10. Each group of headers 10 is provided with horizontal convex joints at both ends of the length direction.

[0034] The housing 400 includes surrounding panels 401 and a back panel 402;

[0035] The transparent cover plate 20 is installed on the upper layer of the heat exchange core 100. A heat-absorbing coating 500 is provided between the transparent cover plate 200 and the upper surface of the heat exchange core 100. A back plate 402 is provided on the lower surface of the heat exchange core 100. An insulation layer 300 is provided between the back plate 402 and the lower surface of the heat exchange core 100.

[0036] The two groups of connection interfaces of one collecting pipe 10 are two groups of inlets, and the two groups of connection interfaces of the other collecting pipe 10 are two groups of outlets. The two groups of collecting pipes 10 are combined to form two inlet and two outlet interfaces, ensuring the uniformity of the flow distribution of the cooling medium.

[0037] In a specific implementation, each group of manifolds 10 includes a tube body 11, a central flow channel cavity 14 is provided at the center of the tube body 11, and a plurality of manifold inserting grooves 12 are sequentially provided along the length direction on the inner ring wall of the tube body 11, and each group of manifold inserting grooves 12 is connected to the central flow channel cavity 14;

[0038] Each group of microchannel flat tubes 20 includes a metal plate 21, which includes an outer contour edge 22 extending in the longitudinal direction and a plurality of independent microchannels 23 arranged in sequence in the width direction. Adjacent microchannels 23 are separated by vertical plates 24. End connectors 25 for connecting to the manifold insertion slots are provided at both ends of the length direction of each group of microchannel flat tubes.

[0039] Several groups of microchannel flat tubes 20 are arranged in parallel and spaced apart along a plane to form a flat plate area 30. Two groups of manifolds 10 are arranged on either side of the flat plate area 30. The end connectors 25 of each group of microchannel flat tubes 20 are inserted into the manifold insertion grooves 12 at the corresponding longitudinal positions of the manifolds 10 on the corresponding side and sealed.

[0040] During specific implementation, the collecting pipe 10 is a round tube, and the horizontal convex joint is a round tube quick joint 40. The round tube quick joint 40 includes a sleeve docking inlet 41 and a sleeve docking outlet 42. The sleeve docking inlet 4 of the round tube quick joint 40 is inserted into the connection interface 13 of the round tube, which makes the docking fast and reliable and reduces the assembly time. The sleeve docking outlet 42 is reasonably arranged according to the size of the external pipe to ensure rapid adaptation to the external pipe.

[0041] In specific implementation, after the round tube quick connector 40 is installed on the connection interface 13, the round tube quick connector 40 is arranged parallel to the plane area 30, ensuring that the thickness of the entire heat exchange core is relatively small, ensuring that the thickness of the flat-plate solar collector is small, and meeting various installation conditions.

[0042] In a specific implementation, the heat absorption coating 500 is specifically a metal-based heat absorption coating, a new nano-coating, an organic silicon heat absorption coating or a ceramic-based heat absorption coating.

[0043] In specific implementation, a temperature sensor interface is provided at the water outlet to which the manifold 10 is connected, so as to facilitate installation of a temperature sensor to detect and control the temperature at the water outlet;

[0044] An exhaust device is provided at the water outlet connected to the collecting pipe 10 to release the air pockets generated inside the system and improve the heat exchange efficiency of the system.

[0045] In specific implementation, the filling material of the insulation layer 300 is at least one of expanded polypropylene material (EPP), polyurethane foam (EPU), polystyrene foam (EPS) and polyethylene foam (EPE). The insulation layer 300 plays a role in thermal insulation, preventing heat loss and improving thermal efficiency.

[0046] During specific implementation, the end connector 25 of the microchannel flat tube 20 includes an arc-shaped upward guide portion 251 and a horizontal plug-in end connector 252. An independent microchannel is synchronously arranged in the inner cavity of the end connector 25. The arc-shaped upward guide portion 251 through which the end connector 25 passes is formed by bending the sheet metal, which does not affect the arrangement of the microchannel. Since the height of the manifold plug-in slot 12 of the manifold 10 is relatively higher than the microchannel flat tube 20 in a planar state, the horizontal plug-in end connector 12 of an adapted height is obtained by bending the two ends of the flat plate corresponding to the microchannel flat tube 20 in the length direction, ensuring that the bottom of the microchannel flat tube 20 and the manifold 10 are at the same plane height, and then adapted to the installed back plate 402.

[0047] In specific implementation, the microchannel flat tube 20 is a thin-walled porous flat tube made of refined aluminum rod by hot extrusion and surface zinc spraying anti-corrosion treatment. The density of aluminum is 2.7g / cm 3 Aluminum has a low density. By utilizing this property of aluminum, the high-efficiency flat-plate collector is lighter in weight and bears less ground / roof load during installation.

[0048] Several microchannel flat tubes 20 are arranged in parallel with gaps between them. The specifications of a single microchannel flat tube 20 are width (30-100)*height (2-3) mm, the number of internal flow holes is 20-50 (aperture size length (1.5-4.0)*height (1.5-2.6) mm). The technical parameters of this microchannel flat tube are that the coolant flows in from the inlet pipe and flows out from the outlet pipe under a certain heat exchange state, ensuring that the flow entering each microchannel flat tube is all coolant, thereby improving This improves the uniformity of the refrigerant flow entering the microchannel flat tube process. Each manifold has specifications of φ15-32*1.5mm. This manifold utilizes circular tube technology. Given the same cross-sectional area, circular tubes have a higher flow rate than square tubes. This is because circular tubes have a smaller internal surface area, resulting in less flow resistance and higher flow rates. The ratio of the internal surface area of ​​circular tubes to that of square tubes is 1.77:2. Therefore, circular tubes typically have a higher flow rate than square tubes due to their lower flow resistance.

[0049] After the microchannel flat tubes and the collecting pipes are assembled and pass the sealing pressure test: nitrogen pressure 1.0MPa, helium 0.6MPa without leakage, they are used to assemble the solar flat-plate collector.

[0050] In a specific implementation, the heat exchange medium is at least one of ethylene glycol, propylene glycol, thermal oil, deionized water, or a nanofluid new heat transfer medium.

[0051] The principle is as follows: the heat exchange core is formed by combining two groups of manifolds and several microchannel flat tubes, wherein the microchannel flat tubes are obtained by manufacturing and processing light metals. The processing and manufacturing of each group of microchannel flat tubes does not require welding, which reduces the manufacturing cost. In addition, multiple groups of microchannels are arranged in sequence in each group of microchannel flat tubes to form a flow channel, thereby increasing the heat exchange area. In addition, since the two groups of manifolds form two inlet and two outlet interfaces, the uniformity of the flow distribution of the cooling medium is guaranteed. In summary, the flat-plate solar collector can ensure uniform and reliable heat exchange within the flat plate area, and the manufacturing and installation costs are low.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0053] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A flat-plate solar collector, characterized in that: It includes: The heat exchange core includes two manifolds, several groups of microchannel flat tubes, and corresponding horizontal convex joints. The manifolds are provided with convex connection interfaces at both ends in the longitudinal direction. The several groups of microchannel flat tubes are arranged in parallel and spaced apart, and the two ends are respectively connected to the corresponding manifolds. Each group of manifolds is provided with horizontal convex joints at both ends in the longitudinal direction. Transparent cover; and a housing comprising surrounding panels and a back panel; The transparent cover is installed on the upper layer of the heat exchange core, a heat-absorbing coating is provided between the transparent cover and the upper surface of the heat exchange core, a back plate is provided on the lower surface of the heat exchange core, and a heat-insulating layer is provided between the back plate and the lower surface of the heat exchange core; The two groups of connection interfaces of one collecting pipe are two groups of inlets, and the two groups of connection interfaces of the other collecting pipe are two groups of outlets. The two groups of collecting pipes are combined to form two inlet and two outlet interfaces.

2. A flat-plate solar collector according to claim 1, characterized in that: Each group of collecting pipes includes a pipe body, a central flow channel cavity is provided in the center of the pipe body, and a plurality of collecting pipe insertion grooves are sequentially arranged at intervals along the length direction on the inner ring wall of the pipe body, and each group of collecting pipe insertion grooves is connected to the central flow channel cavity.

3. A flat-plate solar collector according to claim 2, characterized in that: Each group of microchannel flat tubes includes a metal plate body, which includes an outer contour edge extending in the length direction and a number of independent microchannels arranged in sequence in the width direction. Adjacent microchannels are separated by vertical plates. End joints for docking with the manifold insertion slots are respectively provided at both ends in the length direction of each group of microchannel flat tubes.

4. A flat-plate solar collector according to claim 3, characterized in that: Several groups of microchannel flat tubes are arranged in parallel and spaced apart along a plane to form a flat plate area. Two groups of collecting pipes are arranged on both sides of the flat plate area respectively. The end joints of each group of microchannel flat tubes are inserted into the collecting pipe insertion grooves at the corresponding length direction positions of the collecting pipes on the corresponding side.

5. The flat-plate solar collector according to claim 1, characterized in that: The collecting pipe is specifically a round tube, the horizontal convex joint is a round tube quick joint, the round tube quick joint has a sleeve docking inlet and a sleeve docking outlet, and the sleeve docking inlet of the round tube quick joint is sleeved on the connection interface of the round tube.

6. The flat-plate solar collector according to claim 1, characterized in that: The heat-absorbing coating is specifically a metal-based heat-absorbing coating, a new nano-coating, an organic silicon heat-absorbing coating or a ceramic-based heat-absorbing coating.

7. The flat-plate solar collector according to claim 1, characterized in that: The filling material of the thermal insulation layer is at least one of expanded polypropylene material EPP, polyurethane foam EPU, polystyrene foam EPS or polyethylene foam EPE, and the filling material of the thermal insulation layer plays a role of thermal insulation.

8. The flat-plate solar collector according to claim 3, characterized in that: The end joint of the microchannel flat tube includes an arc-shaped upward guide part and a horizontal plug-in end joint. An independent microchannel is synchronously arranged in the inner cavity of the end joint. The arc-shaped upward guide part through which the end joint passes is formed by bending sheet metal.

9. The flat-plate solar collector according to claim 3, characterized in that: The microchannel flat tube is a thin-walled porous flat tube formed by hot extrusion of a refined aluminum rod and subjected to surface zinc spraying anti-corrosion treatment.

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