Heat exchange core of solar flat plate collector

Abstract

The invention provides a heat exchange core of a solar flat plate collector, which is simple to manufacture and not easy to scale, and ensures long-term and reliable operation of the collector. The heat exchanger comprises two sets of collecting pipes, each collecting pipe comprises a pipe body, a center runner cavity is formed in the center of the pipe body, a plurality of collecting pipe inserting grooves are sequentially formed in one radial annular wall of the pipe body at intervals in the length direction, and each collecting pipe inserting groove is communicated with the corresponding center runner cavity; the two ends, in the length direction, of the collecting pipe are provided with outwards-protruding connecting ports correspondingly. Each group of micro-channel flat tubes comprises a metal plate body, each metal plate body comprises an outer contour edge extending in the length direction and a plurality of independent micro-channels sequentially arranged in the width direction, and the adjacent micro-channels are separated through vertical plates; end connectors used for being in butt joint with the collecting pipe inserting grooves are arranged at the two ends of each set of micro-channel flat pipes in the length direction correspondingly.

Description

Technical Field

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

[0002] The existing heat exchange core structure types used in solar flat-plate collectors include tube-sheet type, wing-tube type, flat box type, radiant tube type, flat heat pipe type and the like. The heat exchange core structure of the collector is to weld a heat exchange flow channel on the back of a metal heat absorbing plate, or to weld two metal plates together 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 prone to cracking, and the molding process is complicated. Secondly, the copper tube plate core will cause scaling in the copper tube after long-term use. The reason is that the inner cavity diameter of the copper tube is generally relatively large, which makes the heat exchange area in a single pipeline relatively large, and it is easy for impurities to remain in the difficult flow area of the pipeline, which makes the copper tube plate core scale in the copper tube after long-term use, thereby affecting heat exchange and service life.

[0003] Therefore, it is urgent to develop a heat exchange core for the collector that is simple to manufacture and not prone to scaling. Summary of the Invention

[0004] In view of the above problems, the present invention provides a heat exchange core for a solar flat-plate collector, which is simple to manufacture and not prone to scaling, thereby ensuring the long-term and reliable operation of the collector.

[0005] A heat exchange core of a solar flat-plate collector, characterized in that it comprises:

[0006] Two sets of manifolds, each set of manifolds comprising a tube body, a central flow channel cavity being provided at the center of the tube body, a plurality of manifold insertion slots being provided sequentially and spaced apart along the length of one radial annular wall of the tube body, each set of manifold insertion slots being connected to the central flow channel cavity, and an outwardly protruding connection interface being provided at each end of the longitudinal direction of the manifold;

[0007] and a plurality of groups of microchannel flat tubes, each group of microchannel flat tubes comprising a metal plate body, the metal plate body comprising an outer contour edge extending in the length direction and a plurality of independent microchannels arranged in sequence in the width direction, adjacent microchannels being separated by vertical plates, and each group of microchannel flat tubes being provided with end connectors for docking with manifold insertion slots at both ends in the length direction;

[0008] 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. The end joints of each group of microchannel flat tubes are inserted into the collecting pipe insertion grooves at the corresponding longitudinal positions of the collecting pipes on the corresponding side and sealed.

[0009] It is further characterized by:

[0010] The connection interfaces at both ends of the length direction of one of the manifolds are medium inlets, and the connection interfaces at both ends of the length direction of the other manifold are medium outlets, which makes the two sets of manifolds form two inlet and two outlet interfaces, ensuring the uniformity of the flow distribution of the heat exchange medium;

[0011] 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 the docking fast and reliable and reduces the 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.

[0012] After the round tube quick connector is installed on the connection interface, the round tube quick connector is arranged parallel to the plane area, 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;

[0013] The upper surface of the flat plate area formed by the arrangement of the microchannel flat tubes is provided with a heat absorbing coating;

[0014] 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;

[0015] 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;

[0016] 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.

[0017] A back plate is further provided at the bottom of the assembled heat exchange core, and an insulation layer filling material is further 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.

[0018] 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 the appropriate height is obtained by bending the two ends of the flat plate corresponding to the microchannel flat tube in the length direction, ensuring that the bottoms of the microchannel flat tube and the manifold are at the same plane height, thereby adapting to the installation backplane.

[0019] The outer contour edge is arranged along the length direction of the microchannel flat tube, and includes a left semicircular edge, a right semicircular edge, an upper edge, and a lower edge;

[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 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 production cost. In addition, multiple groups of microchannels are arranged in sequence in each group of microchannel flat tubes to form a flow channel. The longitudinal cross-sectional area of the flow channel of each group of microchannels is small, and the heat exchange medium is completely and fully flushed to every angle of the microchannel, which makes it difficult to scale in the microchannel; it is simple to manufacture and is not prone to scaling, ensuring the long-term and reliable operation of the collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the top view structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0024] Figure 3 It is a schematic side cross-sectional structural diagram of the present invention;

[0025] Figure 4 for Figure 2 A local enlarged schematic diagram of point A;

[0026] Figure 5 for Figure 3 A partial enlarged diagram of point B

[0027] Figure 6 is a side view of the header of the present invention;

[0028] The names corresponding to the serial numbers in the figure are as follows:

[0029] Collecting pipe 10, tube 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, left semicircular edge 221, right semicircular edge 222, upper edge 223, lower edge 224, microchannel 23, vertical plate 24, end joint 25, guide part 251, horizontal plug-in end joint 252, flat plate area 30, round tube quick connector 40, sleeve docking inlet 41, sleeve docking outlet 42. DETAILED DESCRIPTION

[0030] A heat exchange core of a solar flat plate collector, see Figures 1-6 , which includes two groups of manifolds 10 and several groups of microchannel flat tubes 20;

[0031] 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 insertion slots 12 are sequentially provided along the length direction on one radial annular wall of the tube body 11. Each group of manifold insertion slots 12 is connected to the central flow channel cavity 14, and an outwardly protruding connection interface 13 is provided at each end of the longitudinal direction of the manifold 10.

[0032] 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.

[0033] 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 slots 12 at corresponding longitudinal positions of the manifold 10 on the corresponding side and sealed. In specific implementation, the connection interfaces 13 at both ends of the longitudinal direction of one manifold 10 serve as the medium inlet, and the connection interfaces 13 at both ends of the longitudinal direction of the other manifold 10 serve as the medium outlet. This allows the two groups of manifolds 10 to form two-inlet and two-outlet interfaces, ensuring uniform flow distribution of the heat exchange medium.

[0034] During specific implementation, a round tube quick connector 40 is also included. The round tube quick connector 40 includes a sleeve docking inlet 41 and a sleeve docking outlet 42. The sleeve docking inlet 4 of the round tube quick connector 40 is inserted into the circular connection interface 13, 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.

[0035] 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.

[0036] In a specific implementation, the upper surface of the flat plate area 30 formed by the arrangement of the microchannel flat tubes 20 is provided with a heat absorbing coating;

[0037] The heat-absorbing coating material is specifically a metal-based heat-absorbing coating, a new nano-coating, a silicone-based heat-absorbing coating or a ceramic-based heat-absorbing coating.

[0038] 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;

[0039] 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.

[0040] During specific implementation, a back plate is provided at the bottom of the assembled heat exchange core, 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 material (EPP), polyurethane foam (EPU), polystyrene foam (EPS) and polyethylene foam (EPE). The insulation layer filling material plays a role in thermal insulation, preventing heat loss and improving thermal efficiency.

[0041] In a specific implementation, the end fitting 25 of the microchannel flat tube 20 includes an arc-shaped upward guide portion 251 and a horizontal plug-in end fitting 252. An independent microchannel is synchronously provided in the inner cavity of the end fitting 25. The arc-shaped upward guide portion 251 through which the end fitting 25 passes is formed by bending the sheet metal, 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 the microchannel flat tube 20 in a flat state, the horizontal plug-in end fitting 12 of the adaptable height is obtained by bending the two ends of the length direction of the flat plate corresponding to the microchannel flat tube 20, ensuring that the bottoms of the microchannel flat tube 20 and the manifold 10 are at the same plane height, thereby adapting to the installation backplane;

[0042] The outer contour edge 22 is arranged along the length direction 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 .

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The principle is as follows: the microchannel flat tubes are made by lightweight metal processing. The processing and production of each group of microchannel flat tubes does not require welding, which reduces the production cost. In addition, multiple groups of microchannels are arranged in sequence in each group of microchannel flat tubes to form a flow channel. The longitudinal cross-sectional area of the flow channel of each group of microchannels is small, and the heat exchange medium is fully and fully flushed to every angle of the microchannel, which makes it difficult to scale in the microchannel; it is simple to produce and not prone to scaling, ensuring the long-term and reliable operation of the collector.

[0047] 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.

[0048] 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 heat exchange core of a solar flat-plate collector, characterized in that: It includes: Two sets of manifolds, each set of manifolds comprising a tube body, a central flow channel cavity being provided at the center of the tube body, a plurality of manifold insertion slots being provided sequentially and spaced apart along the length of one radial annular wall of the tube body, each set of manifold insertion slots being connected to the central flow channel cavity, and an outwardly protruding connection interface being provided at each end of the longitudinal direction of the manifold; and a plurality of groups of microchannel flat tubes, each group of microchannel flat tubes comprising a metal plate body, the metal plate body comprising an outer contour edge extending in the length direction and a plurality of independent microchannels arranged in sequence in the width direction, adjacent microchannels being separated by vertical plates, and each group of microchannel flat tubes being provided with end connectors for docking with manifold insertion slots at both ends in the length direction; 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. The end joints of each group of microchannel flat tubes are inserted into the collecting pipe insertion grooves at the corresponding longitudinal positions of the collecting pipes on the corresponding side and sealed.

2. The heat exchange core of a solar flat-plate collector according to claim 1, characterized in that: The connection interfaces at both ends of one collecting pipe in the length direction are medium inlets, and the connection interfaces at both ends of the other collecting pipe in the length direction are medium outlets, which enables the two groups of collecting pipes to form two-inlet and two-outlet interfaces.

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 connecting interface of the collecting pipe is a round tube, the sleeve docking inlet of the round tube quick connector is inserted into the connecting 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 on the connection interface, the round tube quick connector is arranged parallel to the plane 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 new nano-coating, an organic silicon 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: A back plate is also provided at the bottom of the assembled heat exchange core, 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 material 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 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 heat exchange core of a solar flat-plate collector according to claim 1, characterized in that: The outer contour edge is arranged along the length direction 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 a refined aluminum rod and subjected to surface zinc spraying anti-corrosion treatment.

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