Heat exchange core of solar flat-plate collector

Abstract

The utility model provides a kind of heat exchange core of solar flat-plate collector, it is simple to make, and not easy to scale, ensure the long reliable operation of collector.It includes: two groups of flow collection pipe, each group of flow collection pipe includes tube body, the center of the tube body is provided with center flow channel cavity, one radial ring wall of the tube body is sequentially spaced apart and is provided with several flow collection pipe plug-in slot along length direction, each group of flow collection pipe plug-in slot is communicated to center flow channel cavity, the two ends of the length direction of the flow collection pipe are respectively provided with the connection interface of outer convex;And several groups of microchannel flat tube, each group of microchannel flat tube includes metal plate body, the metal plate body includes length direction in-line outer contour edge and several independent microchannels arranged in width direction, adjacent microchannel is separated by vertical plate, the length direction two ends of each group of microchannel flat tube are respectively provided with end connector for butting flow collection pipe plug-in slot.

Description

Technical Field

[0001] This utility model relates to the technical field of solar thermal collection, specifically to a heat exchange core for a solar flat plate collector. Background Technology

[0002] Existing heat exchanger core structures for solar flat-plate collectors include tube-plate, wing-tube, flat-box, jet-tube, and flat-plate heat pipe types. These collector heat exchanger core structures involve welding heat exchange channels onto the back of a metal absorber plate, or welding two metal plates together to form a channel. The metal absorber plate or welded metal plate primarily uses copper tube cores. Copper tube cores are heavy, resulting in high costs. Furthermore, the welding method is prone to weld cracking and has a complex forming process. Secondly, after prolonged use, copper tube cores tend to accumulate scale inside the copper tubes. This is because the inner diameter of copper tubes is generally relatively large, resulting in a relatively large heat exchange area within a single tube. This makes it easy for impurities to remain in the less fluid areas of the tube, leading to scale buildup and affecting heat exchange and service life.

[0003] Therefore, there is an urgent need to develop a heat exchanger core for solar collectors that is simple to manufacture and does not easily accumulate scale. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a heat exchange core for a solar flat plate collector, which is simple to manufacture and not prone to scaling, ensuring the long-term reliable operation of the collector.

[0005] A heat exchange core for a solar flat-plate collector, characterized in that it comprises: Two sets of manifolds, each set of manifolds includes a pipe body, the center of which is provided with a central flow channel cavity, and a number of manifold insertion slots are sequentially spaced along the length of one radial annular wall of the pipe body, each set of manifold insertion slots is connected to the central flow channel cavity, and both ends of the manifold in the length direction are respectively provided with protruding connection interfaces. And several sets of microchannel flat tubes, each set of microchannel flat tubes includes a metal plate, the metal plate includes an outer contour edge extending in the length direction and several independent microchannels arranged in sequence in the width direction, adjacent microchannels are separated by vertical plates, and each set of microchannel flat tubes is provided with end connectors for connecting to the manifold insertion slot at both ends in the length direction. Several groups of microchannel flat tubes are arranged in parallel along a plane to form a flat plate area. Two groups of manifolds are 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 the corresponding length direction of the manifolds on the corresponding side and sealed.

[0006] Its further features are: One of the manifolds has two inlets along its length, and the other manifold has two outlets along its length. This creates two inlets and two outlets, ensuring the uniformity of the heat exchange medium flow distribution. It also includes a round tube quick connector, which includes a sleeve docking inlet and a sleeve docking outlet. When the connection interface of the manifold is a round tube, the sleeve docking inlet of the round tube quick connector is inserted into the connection interface of the round tube, which makes docking quick and reliable and reduces assembly time. The sleeve docking outlet is reasonably arranged according to the size of the external pipeline to ensure quick adaptation with the external pipeline. After the round tube quick connector is installed at the connection interface, the round tube quick connector is arranged parallel to the flat plate area to ensure that the thickness of the entire heat exchange core is relatively small, thus ensuring that the thickness of the flat plate solar collector is small and meeting various installation conditions. A heat-absorbing coating is provided on the upper surface of the flat plate area formed by the arrangement of the microchannel flat tubes. The heat-absorbing coating is specifically a metal-based heat-absorbing coating, a novel nano-coating, an organosilicon heat-absorbing coating, or a ceramic-based heat-absorbing coating. A temperature sensor interface is provided at the outlet of the manifold to facilitate the installation of a temperature sensor to detect and control the temperature at the outlet. An exhaust device is installed at the outlet of the manifold to release the cavitation generated inside the system and improve the system's heat exchange efficiency. The bottom of the assembled heat exchange core is also provided with a back plate, and an insulation layer filling material is provided between the bottom of the heat exchange core and the back plate. The insulation layer filling material is at least one of expanded polypropylene (EPP), polyurethane foam (EPU), polystyrene foam (EPS), or polyethylene foam (EPE). The insulation layer filling material plays a role in heat insulation, preventing heat loss and improving thermal efficiency. The end connector of the microchannel flat tube includes an upwardly curved guide portion and a horizontal insertion end connector. An independent microchannel is synchronously arranged in the inner cavity of the end connector. The upwardly curved guide portion of the end connector is formed by sheet metal bending and does not affect the arrangement of the microchannel. Since the height of the manifold insertion slot of the manifold is relatively higher than that of the microchannel flat tube in the planar state, the horizontal insertion end connector with a suitable height is obtained by bending both ends of the plate corresponding to the microchannel flat tube in the length direction, so as to ensure that the bottom of the microchannel flat tube and the manifold are at the same plane height, and thus adapt to the installation of the back plate. The outer contour edge extends along the length of the microchannel flat tube and includes a left semicircular edge, a right semicircular edge, an upper edge, and a lower edge. The microchannel flat tube is a thin-walled, porous flat tube formed by hot extrusion of refined aluminum rods and surface zinc spraying for corrosion protection. The density of aluminum is 2.7 g / cm³.3 Aluminum has a low density, which makes high-efficiency flat-plate solar collectors lighter and subject to less load on the ground / roof during installation.

[0007] With this invention, the microchannel flat tubes are made of lightweight metal. Each set of microchannel flat tubes can be manufactured without welding, which reduces manufacturing costs. Furthermore, multiple sets of microchannels are arranged sequentially within each set of microchannel flat tubes to form a flow channel. The longitudinal cross-sectional area of ​​each microchannel is small, allowing the heat exchange medium to fully and completely scour every angle of the microchannel, making it less prone to scaling. Its simple manufacturing process and resistance to scaling ensure the long-term reliable operation of the solar collector. Attached Figure Description

[0008] Figure 1 This is a top view structural diagram of the present invention; Figure 2 This is a schematic diagram of the main view structure of this utility model; Figure 3 This is a side sectional view of the present invention. Figure 4 for Figure 1 A magnified view of part A; Figure 5 for Figure 3 Enlarged view of part B Figure 6 This is a side view of the manifold of this utility model; The names corresponding to the serial numbers in the diagram are as follows: 10. Manifold 11. Pipe body 12. Manifold insert slot 13. Connecting interface 14. Central flow channel cavity 14. Microchannel flat tube 20. Metal plate 21. Outer contour edge 22. Left semicircular edge 221. Right semicircular edge 222. Top edge 223. Bottom edge 224. Microchannel 23. Vertical plate 24. End connector 25. Guide part 251. Horizontal insert end connector 252. Flat plate area 30. Round tube quick connector 40. Sleeve docking inlet 41. Sleeve docking outlet 42. Detailed Implementation

[0009] A heat exchange core for a solar flat-plate collector, see Figures 1-6 It includes two sets of manifolds 10 and several sets of microchannel flat tubes 20; Each group of manifolds 10 includes a pipe body 11. A central flow channel cavity 14 is provided in the center of the pipe body 11. A number of manifold insertion slots 12 are arranged sequentially along the length direction on one of the radial annular walls of the pipe body 11. Each group of manifold insertion slots 12 is connected to the central flow channel cavity 14. Both ends of the manifold 10 in the length direction are respectively provided with protruding connection interfaces 13. Each group of microchannel flat tubes 20 includes a metal plate 21, the metal plate 21 includes an outer contour edge 22 extending in the length direction and several independent microchannels 23 arranged sequentially in the width direction. Adjacent microchannels 23 are separated by a vertical plate 24. Each group of microchannel flat tubes has an end connector 25 at both ends in the length direction for connecting to the manifold insertion slot. Several sets of microchannel flat tubes 20 are arranged in parallel along the plane to form a flat plate area 30. Two sets of manifolds 10 are arranged on both sides of the flat plate area 30. The end connectors 25 of each set of microchannel flat tubes 20 are inserted into the manifold insertion slots 12 at the corresponding length direction of the manifolds 10 on the corresponding side and sealed. In specific implementation, the connection interfaces 13 at both ends of the length direction of one manifold 10 are the medium inlet, and the connection interfaces 13 at both ends of the length direction of the other manifold 10 are the medium outlet. This makes the two sets of manifolds 10 form two inlet and two outlet interfaces, ensuring the uniformity of the flow distribution of the heat exchange medium. In specific implementation, it also includes a round tube quick connector 40, which includes a sleeve docking inlet 41 and a sleeve docking outlet 42. The sleeve docking inlet 41 of the round tube quick connector 40 is inserted into the circular connection interface 13, which makes docking quick and reliable and reduces assembly time. The sleeve docking outlet 42 is reasonably arranged according to the size of the external pipeline to ensure quick adaptation with the external pipeline.

[0010] In practice, 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 flat plate area 30 to ensure that the thickness of the entire heat exchange core is relatively small, thus ensuring that the thickness of the flat plate solar collector is small and meeting various installation conditions.

[0011] In practice, a heat-absorbing coating is provided on the upper surface of the flat plate area 30 formed by the arrangement of microchannel flat tubes 20. The heat-absorbing coating materials are specifically metal-based heat-absorbing coatings, novel nano-coatings, organosilicon heat-absorbing coatings, or ceramic-based heat-absorbing coatings.

[0012] In practice, a temperature sensor interface is provided at the outlet of the manifold 10 to facilitate the installation of a temperature sensor to detect and control the temperature at the outlet. An exhaust device is installed at the outlet of the manifold 10 to release the cavitation generated inside the system and improve the system's heat exchange efficiency.

[0013] In practice, the bottom of the assembled heat exchange core is also equipped with a back plate, and an insulation layer filling material is also provided between the bottom of the heat exchange core and the back plate. The insulation layer filling material is at least one of expanded polypropylene (EPP), polyurethane foam (EPU), polystyrene foam (EPS) and polyethylene foam (EPE). The insulation layer filling material plays a role in heat insulation, preventing heat loss and improving thermal efficiency.

[0014] In specific implementation, the end connector 25 of the microchannel flat tube 20 includes an arc-shaped upward guide portion 251 and a horizontal insertion end connector 252. An independent microchannel is simultaneously provided 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 sheet metal bending, which does not affect the arrangement of the microchannel. Since the height of the manifold insertion slot 12 of the manifold 10 is relatively higher than that of the microchannel flat tube 20 in the planar state, the horizontal insertion end connector 12 with a suitable height is obtained by bending both ends of the plate corresponding to the microchannel flat tube 20 in the length direction, so as to ensure that the bottom of the microchannel flat tube 20 and the manifold 10 are at the same plane height, and thus adapt to the installation of the back plate. The outer contour edge 22 extends along the length of the microchannel flat tube and includes a left semicircular edge 221, a right semicircular edge 222, an upper edge 223, and a lower edge 224.

[0015] In specific implementation, the microchannel flat tube 20 is a thin-walled, porous flat tube formed by hot extrusion of refined aluminum rods and surface zinc spraying for corrosion protection. The density of aluminum is 2.7 g / cm³. 3 Aluminum has a low density, which makes high-efficiency flat-plate solar collectors lighter and subject to less load on the ground / roof during installation. Several microchannel flat tubes 20 are arranged side by side with gaps between them. The specifications of a single microchannel flat tube 20 are (30-100) mm wide * (2-3) mm high, with 20-50 internal flow holes (hole diameter (1.5-4.0) mm long * (1.5-2.6) mm high). Under certain heat exchange conditions, the refrigerant flows in through the inlet pipe and out through the outlet pipe, ensuring that all the flow into each microchannel flat tube is refrigerant, thereby improving heat exchange efficiency. This improves the uniformity of refrigerant flow into the microchannel flat tube process. Each manifold has a specification of φ15~32*1.5mm. The technical parameters of this manifold are based on round tube technology; under the same cross-sectional area, the flow velocity of a round tube is faster than that of a square tube. This is because the inner surface area of ​​a round tube is smaller, resulting in lower water flow resistance and a faster flow velocity. The ratio of the inner surface area of ​​a round tube to that of a square tube is 1.77:2. The flow resistance of a round tube is lower than that of a square tube; therefore, the flow rate of a round tube is usually greater than that of a square tube.

[0016] After the microchannel flat tube and manifold are assembled, they pass a sealing and pressure resistance test: nitrogen pressure resistance of 1.0MPa and helium pressure of 0.6MPa without leakage. Then they can be used to assemble solar flat plate collectors.

[0017] The principle is as follows: the microchannel flat tubes are made of lightweight metal. Each set of microchannel flat tubes does not require welding, which reduces the manufacturing cost. In addition, multiple sets of microchannels are arranged sequentially in each set of microchannel flat tubes to form a flow channel. The longitudinal cross-sectional area of ​​each microchannel is small, and the heat exchange medium is fully flushed to every angle of the microchannel, which makes it difficult for scale to form in the microchannel. Its simple manufacturing and resistance to scaling ensure the long-term reliable operation of the solar collector.

[0018] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0019] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A heat exchange core for a solar flat-plate collector, characterized in that, It includes: Two sets of manifolds, each set of manifolds includes a pipe body, the center of which is provided with a central flow channel cavity, and a number of manifold insertion slots are sequentially spaced along the length of one radial annular wall of the pipe body, each set of manifold insertion slots is connected to the central flow channel cavity, and both ends of the manifold in the length direction are respectively provided with protruding connection interfaces. And several sets of microchannel flat tubes, each set of microchannel flat tubes includes a metal plate, the metal plate includes an outer contour edge extending in the length direction and several independent microchannels arranged in sequence in the width direction, adjacent microchannels are separated by vertical plates, and each set of microchannel flat tubes is provided with end connectors for connecting to the manifold insertion slot at both ends in the length direction. Several groups of microchannel flat tubes are arranged in parallel along a plane to form a flat plate area. Two groups of manifolds are 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 the corresponding length direction of the manifolds on the corresponding side and sealed.

2. The heat exchange core of a solar flat plate collector according to claim 1, characterized in that: One of the manifolds has two connection ports at both ends along its length as the medium inlet, and the other manifold has two connection ports at both ends along its length as the medium outlet, thus forming a two-inlet, two-outlet interface between the two manifolds.

3. The heat exchange core of a solar flat plate collector according to claim 1, characterized in that: It also includes a round tube quick connector, which includes a sleeve docking inlet and a sleeve docking outlet; when the connection interface of the manifold is a round tube, the sleeve docking inlet of the round tube quick connector is inserted into the connection interface of the round tube.

4. The heat exchange core of a solar flat plate collector according to claim 3, characterized in that: After the round tube quick connector is installed at the connection interface, the round tube quick connector is arranged parallel to the flat plate area.

5. The heat exchange core of a solar flat plate collector according to claim 1, characterized in that: The upper surface of the flat plate area formed by the arrangement of the microchannel flat tubes is provided with a heat-absorbing coating.

6. The heat exchange core of a solar flat plate collector according to claim 5, characterized in that: The heat-absorbing coating is specifically a metal-based heat-absorbing coating, a novel nano-coating, an organosilicon heat-absorbing coating, or a ceramic-based heat-absorbing coating.

7. The heat exchange core of a solar flat plate collector according to claim 1, characterized in that: The bottom of the assembled heat exchange core is also provided with a back plate, and an insulation layer filling material is provided between the bottom of the heat exchange core and the back plate. The insulation layer filling material is at least one of expanded polypropylene (EPP), polyurethane foam (EPU), polystyrene foam (EPS), or polyethylene foam (EPE).

8. The heat exchange core of a solar flat plate collector according to claim 1, characterized in that: The end connector of the microchannel flat tube includes an upwardly curved guide portion and a horizontal insertion end connector. An independent microchannel is synchronously provided in the inner cavity of the end connector. The upwardly curved guide portion through which the end connector passes is formed by sheet metal bending.

9. The heat exchange core of a solar flat plate collector according to claim 1, characterized in that: The outer contour edge extends along the length of the microchannel flat tube and includes a left semicircular edge, a right semicircular edge, an upper edge, and a lower edge.

10. The heat exchange core of a solar flat plate collector according to claim 1, characterized in that: The microchannel flat tube is a thin-walled porous flat tube formed by hot extrusion of refined aluminum rods and surface zinc spraying for corrosion protection.

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