Large-diameter vacuum tube air heat collector capable of being flatly laid

Abstract

The invention relates to the technical field of solar heat utilization air heat collectors, in particular to a large-diameter vacuum tube air heat collector capable of being flatly laid, solves the problems that an existing air heat collector is high in heat collection efficiency and system resistance, heats outlet air through parallel connection of vacuum heat collection tubes, improves the heat collection efficiency, directly circulates air in an inner tube, reduces the resistance and improves the heat collection efficiency. The air circulation efficiency is improved, the vacuum heat collecting pipe comprises a collecting box body, and the vacuum heat collecting pipe comprises an inner pipe communicated with an inner container of the collecting box body; a main air distribution plate is arranged in the header inner container in the length direction, the header inner container is divided into an upper cavity and a lower cavity by the main air distribution plate, an air outlet is formed in the rear end of the upper cavity, and an air inlet is formed in the front end of the lower cavity; the inner pipe is provided with an in-pipe air distribution plate in the length direction, the in-pipe air distribution plate divides the inner pipe into an upper pipeline and a lower pipeline, and the front end of the in-pipe air distribution plate is connected with the main air distribution plate.

Description

Technical Field

[0001] The present invention relates to the technical field of solar thermal utilization air collectors, and particularly relates to a large-diameter vacuum tube air collector that can be laid flat. Background Art

[0002] The proposal of the dual-carbon goal has led to an increasing demand for clean energy in society. As a mature clean energy technology, the market demand for solar thermal utilization has also expanded accordingly. Solar collectors are the core components of solar thermal utilization and the focus of research by scientific research institutions and enterprises in the field of solar thermal utilization. At present, the technology of water system solar collectors is mature and widely used, making important contributions in building hot water and industrial and agricultural thermal energy applications. Compared with water system solar collectors, solar air collectors use air as the heat transfer medium and have no problems such as anti-corrosion and freezing blockage in system applications.

[0003] Common air collectors include flat plate air collectors and vacuum tube air collectors. Among them, there are two types of vacuum tube air collectors: inner inserted tube type and direct through type. The existing air collectors have a small connection diameter, and the collectors are connected by air ducts. The size of the gas flow path is uneven, the flow velocity is unstable, and the flow resistance along the flow path is large. Therefore, in engineering practice, considering the heat collection efficiency and system resistance of solar air collectors, the number of series-connected groups of air collectors is small, the fan head is large, and the system energy consumption is high. Summary of the Invention

[0004] The present invention provides a large-diameter vacuum tube air collector that can be laid flat, which solves the problems of large heat collection efficiency and system resistance of existing air collectors. By parallel heating the outgoing air with vacuum heat pipes, the heat collection efficiency is improved. The air directly flows inside the inner tube, reducing the resistance and improving the air flow efficiency.

[0005] The present invention is realized through the following technical solutions: A large-diameter vacuum tube air collector that can be laid flat, including a collector connection box body. The collector connection box body includes a collector connection box inner liner. Along its length direction, a plurality of vacuum heat pipes are communicated on at least one side wall of the collector connection box body. The vacuum heat pipe includes an inner tube that communicates with the collector connection box inner liner; A main air distribution plate is arranged along the length direction inside the collector connection box inner liner. The main air distribution plate divides the collector connection box inner liner into an upper cavity and a lower cavity. An air outlet is provided at the rear end of the upper cavity, and an air inlet is provided at the front end of the lower cavity; An inner tube air distribution plate is arranged along the length direction inside the inner tube. The inner tube air distribution plate divides the inner tube into an upper pipeline and a lower pipeline. The front end of the inner tube air distribution plate is connected to the main air distribution plate. There is a gap between the rear end of the inner tube air distribution plate and the inner wall end of the inner tube. The gap is used to communicate the upper pipeline and the lower pipeline; The surfaces of the main air distribution plate and the in-pipe air distribution plate are provided with a number of corrugated protrusions.

[0006] Furthermore, the corrugated protrusions are strip-shaped.

[0007] Furthermore, both the main air distribution plate and the in-pipe air distribution plate are made of aluminum plates. The height of the corrugated protrusions is 2 - 30 mm, and the corrugated protrusions are made by stamping.

[0008] Furthermore, the vacuum heat collecting tube is an all-glass vacuum tube, the inner tube is a glass tube, and the outer wall of the inner tube is provided with a heat absorption coating.

[0009] Furthermore, the inner wall of the inner tube is processed by laser etching technology to produce a nanoscale rough surface, and its roughness Ra is 100 - 300 nm; The upper and lower surfaces of the in-pipe air distribution plate are processed by sandblasting or laser etching technology to produce a nanoscale rough surface, and its roughness Ra is 100 - 300 nm.

[0010] Furthermore, the collector connection box body further includes a housing. The inner liner of the collector connection box is arranged inside the housing, and a heat insulation layer is provided between the housing and the inner liner of the collector connection box.

[0011] Furthermore, the diameter of the inner tube is 50 mm - 110 mm, and the inner diameters of the air outlet and the air inlet are 50 mm - 110 mm.

[0012] Furthermore, the cross-sections of the upper cavity and the lower cavity are square. The air outlet and the air inlet are respectively tangent to the inner walls of the upper cavity and the lower cavity.

[0013] Furthermore, a number of vacuum heat collecting tubes are provided on both the left and right sides of the collector connection box body. The tails of a number of vacuum heat collecting tubes on the same side are fixed together by a tail frame.

[0014] The beneficial effects achieved by the present invention compared with the prior art are as follows: 1. In the present invention, the main air distribution plate divides the inner liner of the collector connection box into an upper cavity and a lower cavity. The rear end of the upper cavity is provided with an air outlet, and the front end of the lower cavity is provided with an air inlet. The in-pipe air distribution plate divides the inner tube into an upper pipeline and a lower pipeline. The front end of the in-pipe air distribution plate is connected to the main air distribution plate, and there is a gap between the rear end of the in-pipe air distribution plate and the end of the inner wall of the inner tube. Air first enters the lower cavity from the air inlet, then enters the lower pipelines in each parallel-connected vacuum heat collecting tube, then enters the upper cavity through the upper pipelines, absorbs heat and rises in temperature when flowing through the in-pipe air distribution plate, and finally converges in the upper cavity and is discharged from the air outlet; Heating the outgoing air through parallel connection of vacuum heat pipes to improve the heat collection efficiency. An appropriate outgoing air temperature can avoid problems such as too high outgoing air temperature, prevent the aging of system pipe fittings, valves, etc. caused by too high system temperature, extend the service life of the system, and at the same time prevent the discomfort caused by too high heating temperature and too large body sensation temperature difference. The air directly flows inside the vacuum heat pipe, reducing the resistance, without air blockage and air resistance problems, and improving the air flow efficiency. 2. The surfaces of the main air distribution plate and the in-pipe air distribution plate are provided with a number of wrinkled protrusions, which can cause air turbulence and improve the air heat exchange efficiency. 4. A nano-scale rough surface is machined on the inner wall of the inner pipe, and nano-scale rough surfaces are machined on the upper and lower surfaces of the in-pipe air distribution plate, which can effectively reduce the boundary layer flow effect, cause microscopic air turbulence, improve the heat exchange efficiency, the heat transfer coefficient is increased by about 20 - 25%, and the pressure drop only increases by 3 - 5%. 5. Heating the outgoing air through parallel connection of vacuum heat pipes to avoid problems such as too high outgoing air temperature. Therefore, multiple such air collectors can be installed in series for use. Description of the Drawings

[0015] Figure 1 It is a three-dimensional schematic diagram of the large-diameter vacuum tube air collector described in the present invention; Figure 2 It is a schematic diagram of the connection between the inner tank of the collector header and the inner pipe described in the present invention; Figure 3 It is a side view of the collector header body described in the present invention; Figure 4 It is a schematic diagram of the connection between the main air distribution plate and the in-pipe air distribution plate; In the figure: 1. Collector header body, 2. Vacuum heat pipe, 3. Tail frame, 4. Outer shell, 5. Thermal insulation layer, 6. Inner tank of the collector header, 7. Circular pipe orifice, 8. Sealing pipe seat, 9. Dust-proof decorative ring, 10. Main air distribution plate, 11. In-pipe air distribution plate, 12. Wrinkled protrusion. Detailed Embodiment

[0016] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0017] In the description of the invention, it should be understood that the orientation or positional relationship indicated by terms such as "front", "rear", "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0018] This embodiment discloses a large-diameter vacuum tube air collector that can be tiled, as Figures 1-4 shown, mainly including a collector connection box 1 and two rows of collector heat pipe rows. The two rows of collector heat pipe rows are respectively installed on the left and right sides of the collector connection box 1. The collector heat pipe row includes several vacuum heat pipes arranged side by side. The tails of several vacuum heat pipes 2 on the same side are fixed together by a tail frame 3.

[0019] The collector connection box 1 sequentially includes an outer shell 4, a thermal insulation layer 5, and a collector connection box inner liner 6 from the outside to the inside. The outer shell 4 is composed of metal thin plates such as stainless steel, galvanized sheet, or aluminum alloy and an ABS side cover. Installation holes for vacuum heat pipes are reserved on the side of the outer shell 4, and they can be arranged on both sides or on one side. When the installation holes are arranged on both sides, the collector becomes a horizontal double row. When the installation holes are arranged on one side, the collector is a vertical single row. In this embodiment, there are installation holes on both the left and right sides of the outer shell 4. The thermal insulation layer 5 can be selected from rock wool, glass wool, or other heat-resistant thermal insulation materials, with a thickness of 25 mm - 50 mm. The collector connection box inner liner 6 is formed by bending and welding stainless steel. Installation holes for vacuum heat pipes are provided on the left and right sides of the collector connection box inner liner 6. A main air distribution plate 10 is arranged along the length direction in the collector connection box inner liner 6. The main air distribution plate 10 divides the collector connection box inner liner 6 into an upper cavity and a lower cavity. The cross-sections of the upper cavity and the lower cavity are square. An air outlet is processed at the rear end of the upper cavity, and an air inlet is processed at the front end of the lower cavity. Both the air outlet and the air inlet are circular pipe orifices 7. The air outlet and the air inlet are respectively tangent to the inner walls of the upper cavity and the lower cavity, and the pipe orifice diameter can be 50 mm - 110 mm.

[0020] The vacuum heat pipe 2 is an all-glass vacuum tube. The inner tube is a glass tube, and an endothermic coating is provided on the outer wall of the inner tube. The diameter of the inner tube can be 50 mm - 110 mm. The larger the diameter, the smoother the gas flow. A wind distribution plate 11 inside the tube is arranged along the length direction of the inner tube. The wind distribution plate 11 inside the tube divides the inner tube into an upper pipeline and a lower pipeline. When the vacuum heat pipe is installed in cooperation with the collector connection box, the inner tube first passes through the installation hole of the outer shell 4, and then connects to the installation hole of the collector connection box inner liner 6. The front end of the wind distribution plate 11 inside the tube is connected and fixed to the main air distribution plate 10 in a plug-in manner. There is a gap between the rear end of the wind distribution plate 11 inside the tube and the end of the inner wall of the inner tube. The gap is used to connect the upper pipeline and the lower pipeline. A sealing pipe seat 8 is provided in the gap between the inner tube and the installation hole of the collector connection box inner liner 6. The sealing pipe seat is made of silica gel or rubber. A dust-proof decorative ring 9 is provided in the gap between the inner tube and the installation hole of the outer shell 4, which has the functions of dust prevention, decoration, and fixing and limiting.

[0021] Both the main air distribution plate 10 and the in-pipe air distribution plate 11 are made of aluminum plates. The surfaces of the main air distribution plate 10 and the in-pipe air distribution plate 11 are processed with a number of corrugated protrusions 12 through a stamping process. The corrugated protrusions are irregular long strips, and the height of the corrugated protrusions is 2 - 30 mm, so as to increase air disturbance and improve heat transfer efficiency.

[0022] In order to improve the heat transfer efficiency, a nano-level rough surface is processed on the inner wall of the inner pipe, and nano-level rough surfaces are processed on the upper and lower surfaces of the in-pipe air distribution plate, and their surface roughness Ra is both 200 nm. Under the condition of macroscopic turbulence of the corrugated protrusions, it can effectively reduce the boundary layer flow effect, carry out microscopic turbulence on the air flow, improve the heat transfer efficiency, the heat transfer coefficient is increased by about 20 - 25%, and the pressure drop only increases by 3 - 5%. When the large-diameter vacuum tube air collector that can be laid flat described in this embodiment is put into use, multiple collectors can be used in series. Increasing the diameter of the circular pipe orifice can achieve quick installation with clamps. The collector array directly does not require air duct installation. The circular pipe orifices between the collectors use quick-install clamp joints and are directly butt-connected without the need to add new air ducts. The design of large-diameter direct connection can achieve flat and series installation between air collectors, without problems such as air blockage and increased air resistance caused by the reduction of the pipe orifice or the series air duct, and the installation is quick and simple.

[0023] The specific working process of the large-diameter vacuum tube air collector that can be laid flat described in this embodiment is as follows: Air first enters the lower cavity from the air inlet, then enters the lower pipes in each parallel vacuum heat collecting tube through the lower cavity, then enters the upper cavity through the upper pipes, absorbs heat and warms up when flowing through the in-pipe air distribution plate 11, and finally converges in the upper cavity and is discharged from the air outlet; the air is heated by the parallel vacuum heat collecting tubes to improve the heat collection efficiency. The appropriate air outlet temperature avoids problems such as too high air outlet temperature caused by heating air with series heat collecting tubes in the past, prevents the aging of system pipe fittings, valves, etc. caused by too high system temperature, extends the service life of the system, and at the same time prevents discomfort caused by too high heating temperature and too large body sensation temperature difference; the air directly circulates in the vacuum heat collecting tube, reducing resistance, without air blockage and air resistance problems, and improving the air circulation efficiency.

Claims

1. A flat-layable large-diameter vacuum tube air collector, characterized in that It includes a manifold box body, the manifold box body includes a manifold box inner liner, and a plurality of vacuum heat collecting tubes are communicated along the length direction on at least one side wall of the manifold box body. The vacuum heat collecting tube includes an inner tube communicated with the manifold box inner liner; A main air distribution plate is arranged along the length direction in the manifold box inner liner. The main air distribution plate divides the manifold box inner liner into an upper cavity and a lower cavity. An air outlet is arranged at the rear end of the upper cavity, and an air inlet is arranged at the front end of the lower cavity; An in-tube air distribution plate is arranged along the length direction in the inner tube. The in-tube air distribution plate divides the inner tube into an upper pipeline and a lower pipeline. The front end of the in-tube air distribution plate is connected to the main air distribution plate. There is a gap between the rear end of the in-tube air distribution plate and the end of the inner wall of the inner tube, and the gap is used to communicate the upper pipeline and the lower pipeline; A plurality of corrugated protrusions are arranged on the surfaces of the main air distribution plate and the in-tube air distribution plate.

2. The flat-layable large-diameter vacuum tube air collector according to claim 1, wherein, The corrugated protrusions are strip-shaped.

3. The flat-layable large-diameter vacuum tube air collector according to claim 2, characterized in that, Both the main air distribution plate and the in-tube air distribution plate are made of aluminum plates. The height of the corrugated protrusions is 2 - 30 mm, and the corrugated protrusions are made by stamping.

4. The flat-packable large-diameter vacuum tube air collector according to claim 1, characterized in that, The vacuum heat collecting tube is an all-glass vacuum tube, the inner tube is a glass tube, and an endothermic coating is arranged on the outer wall of the inner tube.

5. The flat-layable large-diameter vacuum tube air collector according to claim 4, characterized in that, A nano-level rough surface is processed on the inner wall of the inner tube by laser etching technology, and its roughness Ra is 100 - 300 nm; Nano-level rough surfaces are processed on the upper and lower surfaces of the in-tube air distribution plate by sandblasting treatment or laser etching technology, and their roughness Ra is 100 - 300 nm.

6. The flat-layable large-diameter vacuum tube air collector according to claim 1, wherein The manifold box body further includes a shell. The manifold box inner liner is arranged in the shell, and a heat insulation layer is arranged between the shell and the manifold box inner liner.

7. The flat-packable large-diameter vacuum tube air collector according to claim 1, characterized in that, The diameter of the inner tube is 50 mm - 110 mm, and the inner diameters of the air outlet and the air inlet are 50 mm - 110 mm.

8. The flat-packable large-diameter vacuum tube air collector according to claim 7, wherein, The cross-sections of the upper cavity and the lower cavity are square, and the air outlet and the air inlet are respectively tangent to the inner walls of the upper cavity and the lower cavity.

9. The flat-packable large-diameter vacuum tube air collector according to any one of claims 1-8, characterized in that, A plurality of vacuum heat collecting tubes are arranged on both the left and right sides of the manifold box body, and the tails of a plurality of vacuum heat collecting tubes on the same side are fixed together by a tail frame.

Images