Large-size flat-plate solar collector

Abstract

The present invention discloses a large-size flat-plate solar collector, belonging to the technical field of solar collectors. It comprises an outer shell, a glass cover plate is fixed on the front side of the outer shell; a heat absorption unit is arranged inside the outer shell, a heat collection tube group connected to the heat absorption unit is arranged on the outer shell; the heat collection tube group is connected to a heat storage unit; the heat absorption unit comprises a heat absorption plate, a first flow channel unit, a second flow channel unit, an aluminum foil airbag unit and a support insulation unit, and a plurality of heat exchange grooves are pressed at intervals on the heat absorption plate; the first flow channel unit comprises a flow channel branch pipe pressed and welded in each heat exchange groove, and the two ends of the flow channel branch pipe are respectively connected to an upper manifold and a lower manifold through a transition part; one end of the upper manifold and the lower manifold are closed, and the other end is movable through the outer shell. The large-size flat-plate solar collector of the present invention can continuously collect heat under low temperature conditions, and can make full use of the heat energy collected, and is more energy-saving to use.

Description

Technical Field

[0001] The invention specifically relates to a large-size flat-plate solar thermal collector, and belongs to the technical field of solar thermal collectors. Background Art

[0002] Solar collectors are devices that absorb solar heat and exchange heat with internal media. Solar collectors are divided into two categories: vacuum tube collectors and flat plate collectors. Vacuum tube collectors absorb and exchange heat through vacuum tubes. The outer and inner tanks are evacuated, and the surface of the inner tank is coated with a heat-absorbing layer. Sunlight passes through the outer tank and shines on the heat-absorbing layer of the inner tank, absorbing the heat of the solar energy. However, the structure is too large and the heat conversion efficiency is average. Flat plate collectors are safe, pressure-bearing, and have high heat collection efficiency. They are becoming more and more popular with users. Existing collectors, such as China Patent Authorization Announcement No.: CN220582774U, disclose a solar flat plate collector with aerogel insulation; it includes a frame, a back plate, a glass cover, and an aerogel. , moldings, glass sealants, thermal insulation, heat absorption plates and metal flow channels; the flat-plate collector has a smaller thickness and good thermal insulation performance, which can improve the thermal efficiency of the flat-plate collector; another example is China Patent Publication No.: CN115264961A, which discloses a solar flat-plate collector, which realizes the collection of heat from the solar flat plate under the flexible action of the cooperation of the heat absorption panel and the heat exchange inner capsule, and can adapt to the heat exchange needs under different flow rates and pressures. The existing solar collectors cannot collect heat at low temperatures, and the heat energy accumulated in the heat storage unit is easily consumed during the circulation process. In addition, the entire heat storage unit requires an external auxiliary heater to continuously provide high-power heat supplement at low temperatures, which makes the external auxiliary heater in an energy-consuming state for a long time. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a large-sized flat-plate solar collector, which can continuously collect heat under low temperature conditions and can fully utilize the collected heat energy, making it more energy-efficient.

[0004] The large-size flat-plate solar collector of the present invention comprises an outer shell, a glass cover plate is fixed to the front side of the outer shell; a heat absorbing unit is arranged inside the outer shell, a heat collecting pipe group connected to the heat absorbing unit is arranged on the outer shell; the heat collecting pipe group is connected to the heat storage unit; the outer shell and the glass cover plate form a closed chamber, solar energy can smoothly pass through the glass cover plate and be absorbed by the heat absorbing unit arranged in the closed chamber, the absorbed heat is transferred to the heat collecting pipe group, and is sent to the heat storage unit through the heat collecting pipe group for heat storage; the heat absorbing unit comprises:

[0005] A heat absorbing plate, on which a plurality of heat exchange grooves are pressed at intervals;

[0006] A first flow channel unit, the first flow channel unit comprises a flow channel branch pipe pressed and welded in each heat exchange slot, the two ends of the flow channel branch pipe are respectively connected to the upper manifold and the lower manifold through a transition portion; one end of the upper manifold and the lower manifold are closed, and the other end is movable through the outer shell and connected to the first heat exchange flange; the upper manifold and the lower manifold are welded to the upper and lower parts of the front end surface of the heat absorbing plate;

[0007] The heat absorbing plate and the first flow channel unit are coated with a heat absorbing coating on the outside, which can absorb heat and transfer the heat to the heat exchange medium, and then transfer the heat to the heat storage unit through the heat exchange medium; the heat exchange medium enters the lower manifold from the first heat exchange flange, and after heat exchange through the flow channel branch pipe, it is sent to the upper manifold and discharged through another first heat exchange flange; the flow channel branch pipe is welded to the heat exchange groove of the heat absorbing plate, so that the flow channel branch pipe and the heat absorbing plate are welded into one body; concurrent large flow heat exchange is realized, and heat is sent to the heat storage unit for storage;

[0008] The second flow channel unit is fixed to the back of the heat absorbing plate by brazing; the second flow channel unit comprises straight flat tubes arranged at intervals between adjacent heat exchange grooves, and a bent flat tube is integrally formed between adjacent straight flat tubes to form an S-shaped flow channel; the head and tail of the flow channel are movably extended out of the outer shell and connected to the second heat exchange flange; the first heat exchange flange and the second heat exchange flange are connected to the heat collecting tube group; when the heat absorbing plate absorbs heat, the heat is transferred to the straight flat tubes, and the heat is transferred to the heat exchange medium in the S-shaped flow channel; the heat exchange medium flows in an S-shaped state on the back of the heat absorbing plate, which can fully absorb the heat on the heat absorbing plate;

[0009] An aluminum foil airbag unit, the aluminum foil airbag unit comprises a plurality of aluminum foil airbag layers, the aluminum foil airbag unit is coated and bonded to the bottom surface and the periphery of the heat absorbing plate; the aluminum foil airbag unit is pressed together with the bent flat tube; the aluminum foil airbag unit is used for heat insulation and heat preservation, so that the heat absorbed by the heat absorbing plate will not be dissipated; the heat absorbed by the heat absorbing plate is fully absorbed by the heat exchange medium;

[0010] A support heat preservation unit is provided between the outer shell and the aluminum foil airbag unit; the support heat preservation unit is supported between the outer shell and the aluminum foil airbag unit.

[0011] Furthermore, the support heat-insulating unit comprises a first heat-insulating layer arranged inside the outer shell, an inner shell is arranged inside the first heat-insulating layer, a second heat-insulating layer is arranged inside the inner shell, the second heat-insulating layer is arranged between the aluminum foil airbag unit and the inner shell, the glass cover is pressed together with the inner shell through a heat-insulating pad; the second heat-insulating layer is pressed together with the glass cover; a pressing frame is pressed together with the outer surface of the glass cover, and the pressing frame is fixed to the inner surface of the outer shell through bolts; glass glue is arranged between the pressing frame and the glass cover; the support heat-insulating unit can The heat absorbing unit can be supported and the outside of the heat absorbing unit can be insulated; when the heat absorbing unit collects heat, the aluminum foil airbag unit is used for insulation and heat preservation, so that the heat absorbed by the heat absorbing plate will not dissipate; the aluminum foil airbag unit is insulated by the first insulation layer and the second insulation layer, and can continuously insulate, so that the collected heat is fully transferred to the first flow channel unit and the second flow channel unit; thereby, the heat can be fully transferred to the heat exchange medium; the glass cover plate is limited by the pressing frame and is secondary isolated by glass glue, and the inner shell supports the glass cover plate through the insulation pad.

[0012] Furthermore, the heat collecting tube group includes a heat medium circulation pump, the output end of the heat medium circulation pump is connected to the electric control opening valve, and the output end of the electric control opening valve is connected to the electric control pressure regulating valve; the output end of the electric control pressure regulating valve is connected to two input electric control valves, and the other ends of the two input electric control valves are respectively connected to the first heat exchange flange and the second heat exchange flange on one side; the first heat exchange flange and the second heat exchange flange on the other side are connected to the first three-way valve through the output electric control valve, and the middle end of the first three-way valve is connected to the second three-way valve; a temperature transmitter is provided on the pipeline connecting the first three-way valve and the second three-way valve; the heat storage unit includes a lower cylinder seat with a closed bottom surface, the top of the lower cylinder seat is fixed with an upper cylinder seat by a flange, and the top of the upper cylinder seat is fixed with a cover plate by bolts; a first hollow cylinder is embedded in the inner side of the lower cylinder seat, and a second hollow cylinder is embedded in the inner side of the upper cylinder seat; the first hollow cylinder and the second hollow cylinder One end close to each other is integrally made with a convex edge; a spacer is arranged between the first hollow cylinder and the second hollow cylinder, the convex edge is embedded in the spacer seat, and a one-way valve is opened at the center of the spacer seat; a spacer sleeve is arranged outside the spacer seat; sealant is injected between the spacer seat and the spacer sleeve; the spacer sleeve, the spacer seat and the sealant can be waterproof and sealed outside the connection position between the lower cylinder seat and the upper cylinder seat; an external auxiliary heater is arranged on the inside of the second hollow cylinder; the first hollow cylinder and the second hollow cylinder are connected through an intermediate electric control valve; the bottom of the lower cylinder seat is provided with a water inlet flange, and the top of the upper cylinder seat is provided with a water outlet flange; the lower part of the first hollow cylinder is provided with a first thermal medium flange, and the upper and lower parts of the second hollow cylinder are respectively provided with a second thermal medium flange and a third thermal medium flange; the other two ends of the second three-way valve are respectively connected to the first thermal medium flange and the second thermal medium flange; the third thermal medium flange is connected to the input end of the thermal medium circulation pump.

[0013] When working, the working temperature is divided into four levels from high to low, namely high temperature value, medium temperature value, low temperature value and lower temperature limit value; in the initial state, the concurrent flow channel and the S-shaped flow channel collect heat synchronously, and after the set operation time, the temperature is monitored through the temperature transmitter, and a certain heat collection mode is selected according to the collected temperature;

[0014] When the temperature transmitter detects that the temperature reaches a high temperature value, the intermediate electric control valve and the heat medium circulation pump are turned on, and the circulation pump sends the heat exchange medium to the third heat medium flange, and adjusts the heat exchange medium flow and pressure through the electric control opening valve and the electric control pressure regulating valve, and divides the flow through the two input electric control valves, so that it is sent to the concurrent flow channel and the S-shaped flow channel through the first heat exchange flange and the second heat exchange flange; after completing the heat exchange, it is sent to the first three-way valve through the output electric control valve, and after converging through the first three-way valve, and then completing the temperature collection through the temperature transmitter, the heat exchange medium enters the first hollow cylinder through the second three-way valve and the first heat medium flange, and then enters the second hollow cylinder through the intermediate electric control valve; and the heat exchange medium is sent to the third heat medium flange again through the second hollow cylinder, forming a heat collection and heat storage cycle;

[0015] When the temperature transmitter detects that the temperature is lower than the high temperature value and not lower than the medium temperature value, the intermediate electric control valve and the heat medium circulation pump are turned on, and the circulation pump sends the heat exchange medium to the third heat medium flange, and adjusts the heat exchange medium flow and pressure through the electric control opening valve and the electric control pressure regulating valve, and selects the flow channel through an input electric control valve, so as to send it to the concurrent flow channel through the first heat exchange flange; after the heat exchange is completed, it is sent to the first three-way valve through the output electric control valve, and after the temperature is collected through the temperature transmitter, the heat exchange medium enters the first hollow cylinder through the second three-way valve and the first heat medium flange, and then enters the second hollow cylinder through the intermediate electric control valve; and the heat exchange medium is sent to the third heat medium flange again through the second hollow cylinder, forming a heat collection and heat storage cycle;

[0016] When the temperature transmitter detects that the temperature is lower than the middle temperature value and not lower than the lower temperature limit, the intermediate electric control valve is closed, the heat medium circulation pump is turned on, and the circulation pump sends the heat exchange fluid to the third heat medium flange, and adjusts the heat exchange fluid flow and pressure through the electric control opening valve and the electric control pressure regulating valve, and selects the flow channel through an input electric control valve, so that it is sent to the S-shaped flow channel through the second heat exchange flange; after the heat exchange is completed, it is sent to the first three-way valve through the output electric control valve, and after the temperature is collected through the temperature transmitter, the heat exchange fluid enters the second hollow cylinder through the second three-way valve and the second heat medium flange, and the heat exchange fluid is sent to the third heat medium flange again through the second hollow cylinder, forming a heat collection and heat storage cycle; thus, heat can be collected under low temperature conditions outside, and heat can be stored in the second hollow cylinder;

[0017] When the temperature transmitter detects that the temperature is lower than the lower limit of the temperature, the intermediate electric control valve and the thermal medium circulation pump are closed;

[0018] The water inlet flange delivers the flowing water into the first hollow tube, and exchanges heat with the heat exchange medium of the first hollow tube. After the heat exchange, the flowing water enters the second hollow tube through the one-way valve of the partition seat; and performs secondary heat exchange with the heat exchange medium in the second hollow tube. The flowing water that completes the heat exchange is discharged from the heat storage unit through the water outlet flange; the first hollow tube and the second hollow tube are isolated by the partition seat; the first hollow tube and the second hollow tube can heat and heat the flowing water separately, and after the basic heat exchange is completed in the first hollow tube, the one-way valve can perform secondary heating through the second hollow tube. , so that the hot water discharged from the outlet flange reaches the temperature standard; when the outside is in a low temperature state, the heat can be concentrated in the second hollow tube; thus, there is no need for an external auxiliary heater to provide global continuous heating; the heat exchange output continues to reach the set temperature of hot water, and there is no need to keep the external auxiliary heater in an energy-consuming state for a long time; when the hot water discharged from the outlet flange is lower than the temperature value, the external auxiliary heater is used to supplement the heating of the flowing water entering the second hollow tube; the external auxiliary heater has a small heating volume, and there is no need for the external auxiliary heater to continue to provide high-power heating; it is more energy-efficient to use.

[0019] Furthermore, the inner side of the first hollow tube is a first tube bin portion, the inner side of the second hollow tube includes a reduced diameter section having the same diameter as the first tube bin portion, and the upper part of the reduced diameter section is a second tube bin portion; when flowing water enters the first tube bin portion through the water inlet flange, it first exchanges heat with the heat exchange medium inside the first hollow tube, and the flowing water that has completed the heat exchange passes through the reduced diameter section and the second tube bin portion, and then exchanges heat with the heat exchange medium inside the second hollow tube. After the heat exchange is completed, the hot water is discharged from the outside of the second hollow tube through the water outlet flange of the upper tube seat.

[0020] Furthermore, the lower cylinder seat and the upper cylinder seat are covered with a thermal insulation jacket. By covering the lower cylinder seat and the upper cylinder seat with the thermal insulation jacket, the lower cylinder seat and the upper cylinder seat can be kept warm.

[0021] Furthermore, the first thermal medium flange is connected to the hollow of the first hollow tube, and the second thermal medium flange and the third thermal medium flange are connected to the hollow of the second hollow tube; when the heat exchange medium flows, it can enter the interlayer of the first hollow tube through the first thermal medium flange, pass through the interlayer of the second hollow tube, and flow from the third thermal medium flange to the circulation pump; in addition, when the heat exchange medium flows, it can enter the interlayer of the second hollow tube through the second thermal medium flange, and flow from the third thermal medium flange to the circulation pump.

[0022] Furthermore, the flow cross-sectional area of ​​the flow channel branch is 3 to 10 times the flow cross-sectional area of ​​the straight flat tube; when working, the flow channel branch can meet the concurrent large-flow heat exchange, and the S-shaped flow channel formed by the straight flat tube can perform small-flow heat exchange, thereby being able to perform large-area efficient heat collection and heat storage under high temperature conditions; under low temperature conditions, a small flow and a long flow channel are used for continuous heat collection and heat storage; thereby being able to ensure the heat collection efficiency.

[0023] Compared with the prior art, the large-size flat-plate solar collector of the present invention adopts concurrent and single-channel combined heat collection when the temperature transmitter monitors that the temperature reaches a high temperature value; concurrent heat collection is adopted when the monitored temperature is lower than the high temperature value and higher than the medium temperature value; single-channel heat collection is adopted when the monitored temperature is lower than the medium temperature value and higher than the low temperature value; when the monitored temperature reaches the lower limit of the temperature, the heat medium circulation pump is stopped, and the collected heat is continuously sent to the heat storage unit. In the high temperature state, the heat energy can be fully absorbed; in the low temperature state, the heat is continuously collected, and the heat energy can be fully sent to the heat storage unit. It can also avoid consuming the thermal energy accumulated in the heat storage unit during low-temperature circulation; when in a low-temperature state, a single-channel circulation heat collection is adopted, and the heat is concentratedly stored in the second hollow tube. The incoming water first absorbs basic heat through the first hollow tube, and then is sent to the second hollow tube for secondary heating, so that the heat exchange output reaches hot water at the set temperature; at this time, there is no need for an external auxiliary heater to heat; there is no need to keep the external auxiliary heater in an energy-consuming state for a long time; when an external auxiliary heater is needed for heating, it is isolated by a partition and a one-way valve; the external auxiliary heater has a small heating volume, and there is no need for the external auxiliary heater to continuously provide high-power supplementary heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the large-size flat-plate solar collector of the present invention.

[0025] Figure 2 It is a schematic diagram of the installation structure of the outer shell, glass cover plate, pressure frame, first heat exchange flange and second heat exchange flange of the present invention.

[0026] Figure 3 It is a schematic diagram of the internal structure of the large-sized flat-plate solar collector of the present invention.

[0027] Figure 4 It is a schematic diagram of the installation structure of the heat absorption unit, the aluminum foil airbag unit and the supporting insulation unit of the present invention.

[0028] Figure 5 It is a schematic diagram of the installation structure of the heat absorbing plate and the first flow channel unit of the present invention.

[0029] Figure 6 It is a schematic diagram of the installation structure of the heat absorbing plate and the second flow channel unit of the present invention.

[0030] Figure 7 It is a schematic diagram of the overall structure of the heat storage unit of the present invention.

[0031] Figure 8 For the present invention Figure 7 Schematic diagram of the local enlarged structure at point A in the middle.

[0032] Figure numerals: 1, outer shell, 2, glass cover, 3, heat absorbing plate, 4, flow channel branch, 5, transition part, 6, upper manifold, 7, lower manifold, 8, first heat exchange flange, 9, straight flat tube, 10, bent flat tube, 11, second heat exchange flange, 12, aluminum foil airbag unit, 13, first insulation layer, 14, inner shell, 15, second insulation layer, 16, insulation pad, 17, pressure frame, 18, heat medium circulation pump, 19, electric control opening valve, 20, electric control pressure regulating valve, 21, input electric control valve, 22, output electric control valve, 23, first three-way valve, 24. Second three-way valve, 25. Temperature transmitter, 26. Lower cylinder seat, 27. Upper cylinder seat, 28. Cover plate, 29. First hollow cylinder, 30. Second hollow cylinder, 31. Flange, 32. Spacer, 33. One-way valve, 34. Spacer, 35. Sealant, 36. External auxiliary heater, 37. Intermediate electric control valve, 38. Water inlet flange, 39. Water outlet flange, 40. First thermal medium flange, 41. Second thermal medium flange, 42. Third thermal medium flange, 43. First pipe compartment, 44. Reduced diameter section, 45. Second pipe compartment, 46. Insulation jacket. DETAILED DESCRIPTION

[0033] Example:

[0034] like Figures 1 to 8 The large-size flat-plate solar collector shown comprises an outer shell 1, a glass cover plate 2 is fixed to the front side of the outer shell 1; a heat absorbing unit is arranged inside the outer shell 1, and a heat collecting pipe group connected to the heat absorbing unit is arranged on the outer shell 1; the heat collecting pipe group is connected to the heat storage unit; the outer shell 1 and the glass cover plate 2 form a closed chamber, and the solar energy can smoothly pass through the glass cover plate 2 and be absorbed by the heat absorbing unit arranged in the closed chamber, and the absorbed heat is transferred to the heat collecting pipe group, and is sent to the heat storage unit through the heat collecting pipe group for heat storage; the heat absorbing unit comprises:

[0035] A heat absorbing plate 3, on which a plurality of heat exchange grooves are pressed at intervals;

[0036] The first flow channel unit, the first flow channel unit includes a flow channel branch pipe 4 pressed and welded in each heat exchange groove, and the two ends of the flow channel branch pipe 4 are respectively connected to the upper manifold 6 and the lower manifold 7 through the transition part 5; the upper manifold 6 and the lower manifold 7 are closed at one end, and the other end is movable through the outer shell 1 and connected to the first heat exchange flange 8; the upper manifold 6 and the lower manifold 7 are welded to the upper and lower parts of the front end surface of the heat absorbing plate 3; the heat absorbing plate 3 and the first flow channel unit are coated with a heat absorbing coating on the outside, which can absorb heat and transfer the heat to the heat exchange medium, and then transfer it to the heat storage unit through the heat exchange medium; the heat exchange medium enters the lower manifold 7 from the first heat exchange flange 8, and after heat exchange through the flow channel branch pipe 4, it is sent to the upper manifold 6 and discharged through another first heat exchange flange 8; the flow channel branch pipe 4 is welded to the heat exchange groove of the heat absorbing plate 3, so that the flow channel branch pipe 4 and the heat absorbing plate 3 are welded to form a whole; concurrent large-flow heat exchange is realized, and heat is sent to the heat storage unit for storage;

[0037] The second flow channel unit is fixed to the back of the heat absorbing plate 3 by brazing; the second flow channel unit includes straight flat tubes 9 arranged at intervals between adjacent heat exchange grooves, and bent flat tubes 10 are integrally formed between adjacent straight flat tubes 9 to form an S-shaped flow channel; the head and tail of the flow channel are movably extended out of the outer shell 1 and connected to the second heat exchange flange 11; the first heat exchange flange 8 and the second heat exchange flange 11 are connected to the heat collecting tube group; when the heat absorbing plate 3 absorbs heat, the heat is transferred to the straight flat tubes 9, and the heat is transferred to the heat exchange medium in the S-shaped flow channel; the heat exchange medium flows in an S-shaped state on the back of the heat absorbing plate 3, which can fully absorb the heat on the heat absorbing plate 3;

[0038] The aluminum foil airbag unit 12 includes multiple aluminum foil airbag layers, and the aluminum foil airbag unit 12 is coated and bonded to the bottom surface and the periphery of the heat absorbing plate 3; the aluminum foil airbag unit 12 is pressed together with the bent flat tube 10; the aluminum foil airbag unit 12 is used for heat insulation and heat preservation, so that the heat absorbed by the heat absorbing plate 3 will not be dissipated; the heat absorbed by the heat absorbing plate 3 is fully absorbed by the heat exchange medium;

[0039] The supporting heat-insulating unit is arranged between the outer shell 1 and the aluminum foil airbag unit 12 ; the supporting heat-insulating unit is supported between the outer shell 1 and the aluminum foil airbag unit 12 .

[0040] The support insulation unit includes a first insulation layer 13 arranged on the inner side of the outer shell 1, an inner shell 14 is arranged on the inner side of the first insulation layer 13, a second insulation layer 15 is arranged on the inner side of the inner shell 14, and the second insulation layer 15 is arranged between the aluminum foil airbag unit 12 and the inner shell 14. The glass cover plate 2 is pressed with the inner shell 14 through an insulation pad 16; the second insulation layer 15 is pressed with the glass cover plate 2; a pressing frame 17 is pressed with the outer surface of the glass cover plate 2, and the pressing frame 17 is fixed to the inner surface of the outer shell 1 by bolts; glass glue is arranged between the pressing frame 17 and the glass cover plate 2; the support The heat-insulating support unit can support the heat-absorbing unit and insulate the outside of the heat-absorbing unit; when the heat-absorbing unit collects heat, it is insulated and heat-insulated through the aluminum foil airbag unit 12, so that the heat absorbed by the heat-absorbing plate 3 will not dissipate; the aluminum foil airbag unit 12 is insulated by the first insulation layer 13 and the second insulation layer 15, and can continuously insulate, so that the collected heat is fully transferred to the first flow channel unit and the second flow channel unit; thereby, the heat can be fully transferred to the heat exchange medium; the glass cover plate 2 is limited by the pressing frame 17 and is secondary isolated by glass glue, and the inner shell 14 supports the glass cover plate 2 through the insulation pad 16.

[0041] The heat collecting tube group includes a heat medium circulation pump 18, the output end of the heat medium circulation pump 18 is connected to an electric control opening valve 19, the output end of the electric control opening valve 19 is connected to an electric control pressure regulating valve 20; the output end of the electric control pressure regulating valve 20 is connected to two input electric control valves 21, the other ends of the two input electric control valves 21 are respectively connected to the first heat exchange flange 8 and the second heat exchange flange 11 on one side; the first heat exchange flange 8 and the second heat exchange flange 11 on the other side are connected to the first three-way valve 23 through the output electric control valve 22, and the first three-way valve 2 The middle end of the first three-way valve 23 is connected to the second three-way valve 24; a temperature transmitter 25 is provided on the pipe connecting the first three-way valve 23 and the second three-way valve 24; the heat storage unit comprises a lower cylinder seat 26 with a closed bottom surface, an upper cylinder seat 27 is fixed to the top of the lower cylinder seat 26 by a flange, and a cover plate 28 is fixed to the top of the upper cylinder seat 27 by bolts; a first hollow cylinder 29 is embedded in the inner side of the lower cylinder seat 26, and a second hollow cylinder 30 is embedded in the inner side of the upper cylinder seat 27; the first hollow cylinder 29 and the second hollow cylinder 30 are integrally formed near one end of each other There is a convex edge 31; a spacer 32 is arranged between the first hollow cylinder 29 and the second hollow cylinder 30, the convex edge 31 is embedded with the spacer 32, and a one-way valve 33 is opened at the center of the spacer 32; a spacer sleeve 34 is arranged outside the spacer 32; a sealant 35 is injected between the spacer 32 and the spacer sleeve 34; the spacer sleeve 34, the spacer 32 and the sealant 35 can be waterproof and sealed outside the connection position of the lower cylinder seat 26 and the upper cylinder seat 27; an external auxiliary heater 36 is arranged inside the second hollow cylinder 30; the first hollow cylinder 29 and the second The hollow cylinders 30 are connected through an intermediate electric control valve 37; a water inlet flange 38 is provided at the bottom of the lower cylinder seat 26, and a water outlet flange 39 is provided at the top of the upper cylinder seat 27; a first thermal medium flange 40 is provided at the lower part of the first hollow cylinder 29, and a second thermal medium flange 41 and a third thermal medium flange 42 are provided at the upper and lower parts of the second hollow cylinder 30 respectively; the other two ends of the second three-way valve 24 are connected to the first thermal medium flange 40 and the second thermal medium flange 41 respectively; the third thermal medium flange 42 is connected to the input end of the thermal medium circulation pump 18.

[0042] When working, the working temperature is divided into four levels from high to low, namely high temperature value, medium temperature value, low temperature value and lower temperature limit value; in the initial state, the concurrent flow channel and the S-shaped flow channel collect heat synchronously, and after the set operation time, the temperature is monitored by the temperature transmitter 25, and a certain heat collection mode is selected according to the collected temperature;

[0043] When the temperature transmitter 25 detects that the temperature reaches a high temperature value, the intermediate electric control valve 37 and the heat medium circulation pump 18 are opened, and the circulation pump sends the heat exchange medium to the third heat medium flange 42, and adjusts the heat exchange medium flow and pressure through the electric control opening valve 19 and the electric control pressure regulating valve 20, and divides the flow through the two input electric control valves 21, so as to be sent to the concurrent flow channel and the S-shaped flow channel through the first heat exchange flange 8 and the second heat exchange flange 11; after completing the heat exchange, it is sent to the first three-way valve 23 through the output electric control valve 22, and after converging through the first three-way valve 23, and after completing the temperature acquisition through the temperature transmitter 25, the heat exchange medium enters the first hollow tube 29 through the second three-way valve 24 and the first heat medium flange 40, and then enters the second hollow tube 30 through the intermediate electric control valve 37; and the heat exchange medium is sent to the third heat medium flange 42 again through the second hollow tube 30, forming a heat collection and heat storage cycle;

[0044] When the temperature transmitter 25 detects that the temperature is lower than the high temperature value and not lower than the medium temperature value, the intermediate electric control valve 37 and the heat medium circulation pump 18 are opened, and the circulation pump sends the heat exchange medium to the third heat medium flange 42, and adjusts the heat exchange medium flow and pressure through the electric control opening valve 19 and the electric control pressure regulating valve 20, and selects the flow channel through an input electric control valve 21, so as to be sent to the concurrent flow channel through the first heat exchange flange 8; after the heat exchange is completed, it is sent to the first three-way valve 23 through the output electric control valve 22, and after the temperature is collected through the temperature transmitter 25, the heat exchange medium enters the first hollow tube 29 through the second three-way valve 24 and the first heat medium flange 40, and then enters the second hollow tube 30 through the intermediate electric control valve 37; and the heat exchange medium is sent to the third heat medium flange 42 again through the second hollow tube 30, forming a heat collection and heat storage cycle;

[0045] When the temperature transmitter 25 detects that the temperature is lower than the middle temperature value and not lower than the lower temperature limit, the intermediate electric control valve 37 is closed, and the heat medium circulation pump 18 is turned on. The circulation pump sends the heat exchange medium to the third heat medium flange 42, and adjusts the heat exchange medium flow and pressure through the electric control opening valve 19 and the electric control pressure regulating valve 20, and selects the flow channel through an input electric control valve 21, so that it is sent to the S-shaped flow channel through the second heat exchange flange 11; after the heat exchange is completed, it is sent to the first three-way valve 23 through the output electric control valve 22, and after the temperature is collected through the temperature transmitter 25, the heat exchange medium enters the second hollow tube 30 through the second three-way valve 24 and the second heat medium flange 41, and the heat exchange medium is sent to the third heat medium flange 42 again through the second hollow tube 30, forming a heat collection and heat storage cycle; so that heat can be collected under low temperature conditions outside, and heat can be stored in the second hollow tube 30;

[0046] When the temperature transmitter 25 detects that the temperature is lower than the lower limit of the temperature, the intermediate electric control valve 37 and the heat medium circulation pump 18 are closed;

[0047] The water inlet flange 38 delivers the flowing water into the first hollow tube 29, and exchanges heat with the heat exchange medium in the first hollow tube 29. After the heat exchange, the flowing water enters the second hollow tube 30 through the one-way valve 33 of the partition seat 32; and performs secondary heat exchange with the heat exchange medium in the second hollow tube 30. The flowing water that has completed the heat exchange is discharged from the heat storage unit through the water outlet flange 39; the first hollow tube 29 and the second hollow tube 30 are isolated by the partition seat 32; the first hollow tube 29 and the second hollow tube 30 can heat and heat the flowing water separately, and through the one-way valve 33, after the basic heat exchange is completed in the first hollow tube 29, the flowing water can be discharged from the second hollow tube 3 0 for secondary heating, so that the hot water discharged from the water outlet flange 39 reaches the temperature standard; when the outside is in a low temperature state, the heat can be concentrated in the second hollow tube 30; thus, there is no need for the external auxiliary heater 36 to perform global continuous heating; the heat exchange output continues to reach the set temperature of hot water, and there is no need to keep the external auxiliary heater 36 in an energy-consuming state for a long time; when the hot water discharged from the water outlet flange 39 is lower than the temperature value, the external auxiliary heater 36 is used to supplement the heating of the flowing water entering the second hollow tube 30; the external auxiliary heater 36 has a small heating volume, and there is no need for the external auxiliary heater 36 to continuously perform high-power heating; it is more energy-saving to use.

[0048] The inner side of the first hollow tube 29 is a first tube bin portion 43, and the inner side of the second hollow tube 30 includes a reduced diameter section 44 having the same diameter as the first tube bin portion 43, and the upper part of the reduced diameter section 44 is a second tube bin portion 45; when the flowing water enters the first tube bin portion 43 through the water inlet flange 38, it first exchanges heat with the heat exchange medium inside the first hollow tube 29, and the flowing water that has completed the heat exchange passes through the reduced diameter section 44 and the second tube bin portion 45, and then exchanges heat with the heat exchange medium inside the second hollow tube 30. After the heat exchange is completed, the hot water is discharged to the outside of the second hollow tube 30 through the water outlet flange 39 of the upper tube seat 27.

[0049] The lower cylinder seat 26 and the upper cylinder seat 27 are covered with a heat-insulating jacket 46 . The heat-insulating jacket 46 covers the lower cylinder seat 26 and the upper cylinder seat 27 , so that the lower cylinder seat 26 and the upper cylinder seat 27 can be kept warm.

[0050] The first thermal medium flange 40 is connected to the hollow of the first hollow tube 29, and the second thermal medium flange 41 and the third thermal medium flange 42 are connected to the hollow of the second hollow tube 30; when the heat exchange medium flows, it can enter the interlayer of the first hollow tube 29 through the first thermal medium flange 40, pass through the interlayer of the second hollow tube 30, and flow from the third thermal medium flange 42 to the circulation pump. In addition, when the heat exchange medium flows, it can enter the interlayer of the second hollow tube 30 through the second thermal medium flange 41, and flow from the third thermal medium flange 42 to the circulation pump.

[0051] The flow cross-sectional area of ​​the flow channel branch pipe 4 is 3 to 10 times the flow cross-sectional area of ​​the straight flat tube 9; when working, the flow channel branch pipe 4 can meet the concurrent large-flow heat exchange, and the S-shaped flow channel formed by the straight flat tube 9 can perform small-flow heat exchange, so that large-area efficient heat collection and heat storage can be performed under high temperature conditions; under low temperature conditions, small flow and long flow channels are used for continuous heat collection and heat storage, thereby ensuring the heat collection efficiency.

[0052] The above embodiments are only preferred implementations of the present invention, so any equivalent changes or modifications made according to the structures, features and principles described in the scope of application of the present invention are included in the scope of application of the present invention.

Claims

1. A large-size flat-plate solar collector, comprising an outer shell, a glass cover plate fixed to the front side of the outer shell; a heat absorption unit is arranged inside the outer shell, a heat collection tube group connected to the heat absorption unit is arranged on the outer shell; the heat collection tube group is connected to a heat storage unit; characterized in that: The heat absorption unit comprises: A heat absorbing plate, on which a plurality of heat exchange grooves are pressed at intervals; A first flow channel unit, the first flow channel unit comprises a flow channel branch pipe pressed and welded in each heat exchange slot, the two ends of the flow channel branch pipe are respectively connected to the upper manifold and the lower manifold through a transition portion; one end of the upper manifold and the lower manifold are closed, and the other end is movable through the outer shell and connected to the first heat exchange flange; the upper manifold and the lower manifold are welded to the upper and lower parts of the front end surface of the heat absorbing plate; A second flow channel unit, the second flow channel unit is fixed to the back of the heat absorbing plate by brazing; the second flow channel unit comprises straight flat tubes arranged at intervals between adjacent heat exchange slots, and a bent flat tube is integrally formed between adjacent straight flat tubes to form an S-shaped flow channel; the head and tail of the flow channel are movably extended out of the outer shell and connected to the second heat exchange flange; the first heat exchange flange and the second heat exchange flange are connected to the heat collecting tube group; An aluminum foil airbag unit, the aluminum foil airbag unit comprises multiple aluminum foil airbag layers, the aluminum foil airbag unit is coated and bonded to the bottom surface and periphery of the heat absorbing plate; the aluminum foil airbag unit is pressed together with the bent flat tube; A supporting heat-insulating unit, wherein the supporting heat-insulating unit is arranged between the outer shell and the aluminum foil airbag unit; The heat collecting tube group includes a heat medium circulation pump, the output end of the heat medium circulation pump is connected to the electric control opening valve, and the output end of the electric control opening valve is connected to the electric control pressure regulating valve; the output end of the electric control pressure regulating valve is connected to two input electric control valves, and the other ends of the two input electric control valves are respectively connected to the first heat exchange flange and the second heat exchange flange on one side; the first heat exchange flange and the second heat exchange flange on the other side are connected to the first three-way valve through the output electric control valve, and the middle end of the first three-way valve is connected to the second three-way valve; a temperature transmitter is provided on the pipeline connecting the first three-way valve and the second three-way valve; the heat storage unit includes a lower cylinder seat with a closed bottom surface, an upper cylinder seat is fixed to the top of the lower cylinder seat by a flange, a first hollow cylinder is embedded in the inner side of the lower cylinder seat, and the upper cylinder A second hollow cylinder is embedded in the inner side of the seat; a partition seat is arranged between the first hollow cylinder and the second hollow cylinder, and a one-way valve is opened at the center of the partition seat; an external auxiliary heater is arranged inside the second hollow cylinder, and the flowing water entering the second hollow cylinder is supplementarily heated by the external auxiliary heater; the first hollow cylinder and the second hollow cylinder are connected through an intermediate electric control valve; a water inlet flange is arranged at the bottom of the lower cylinder seat, and a water outlet flange is arranged at the top of the upper cylinder seat; a first thermal medium flange is arranged at the lower part of the first hollow cylinder, and a second thermal medium flange and a third thermal medium flange are arranged at the upper and lower parts of the second hollow cylinder respectively; the other two ends of the second three-way valve are connected to the first thermal medium flange and the second thermal medium flange respectively; the third thermal medium flange is connected to the input end of the thermal medium circulation pump.

2. The large-sized flat-plate solar collector according to claim 1, characterized in that: The supporting insulation unit includes a first insulation layer arranged on the inner side of the outer shell, an inner shell is arranged on the inner side of the first insulation layer, a second insulation layer is arranged on the inner side of the inner shell, the second insulation layer is arranged between the aluminum foil airbag unit and the inner shell, the glass cover plate is pressed together with the inner shell through an insulation pad; the second insulation layer is pressed together with the glass cover plate; a pressing frame is pressed together with the outer surface of the glass cover plate, and the pressing frame is fixed to the inner side of the outer shell through bolts; glass glue is arranged between the pressing frame and the glass cover plate.

3. The large-sized flat-plate solar collector according to claim 1 is characterized in that: A cover plate is fixed to the top of the upper cylinder seat by bolts; the first hollow cylinder and the second hollow cylinder are integrally formed with a convex edge close to one end; the convex edge is embedded in the spacer seat, and a spacer sleeve is arranged outside the spacer seat; sealant is injected between the spacer seat and the spacer sleeve.

4. The large-sized flat-plate solar collector according to claim 3 is characterized in that: The inner side of the first hollow tube is a first tube warehouse part, the inner side of the second hollow tube includes a reduced diameter section, the water inlet of the reduced diameter section has the same diameter as the first tube warehouse part, and the upper part of the reduced diameter section is the second tube warehouse part.

5. The large-sized flat-plate solar collector according to claim 3 is characterized in that: The lower cylinder seat and the upper cylinder seat are covered with a heat-insulating outer jacket.

6. The large-sized flat-plate solar collector according to claim 1, characterized in that: The first thermal medium flange is communicated with the hollow part of the first hollow tube, and the second thermal medium flange and the third thermal medium flange are connected to the hollow part of the second hollow tube.

7. The large-sized flat-plate solar collector according to claim 1 is characterized in that: The flow cross-sectional area of ​​the flow channel branch pipe is 3 to 10 times the flow cross-sectional area of ​​the straight flat pipe.

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