Large-caliber stainless steel flat plate collector capable of being connected in series

Abstract

The utility model provides a large-caliber stainless steel flat plate collector capable of being connected in series, which has better feasibility due to the fact that an inlet and an outlet of the collector are designed to be in a large-caliber form, can realize series connection of a plurality of collectors, reduces use of pipelines, reduces material and installation labor cost, and improves thermal performance of a whole collector array. A heat insulation layer is arranged at the bottom of an inner cavity of the heat collector shell, and a stainless steel tube row composed of a plurality of stainless steel unit tubes distributed side by side is arranged on the heat insulation layer. The front connector and the rear connector of the stainless steel tube row are communicated with stainless steel collecting tubes respectively, and the left ends and the right ends of the stainless steel collecting tubes extend to the outer side of the heat collector shell respectively. A heat absorbing plate is welded to the top face of the stainless steel tube row, and a transparent cover plate for sealing an inner cavity of the heat collector shell is installed at the top end of the heat collector shell.

Description

Technical Field

[0001] This utility model patent relates to a solar thermal utilization collector product, which belongs to the field of renewable energy application technology, and specifically relates to a large-diameter stainless steel flat plate collector that can be connected in series with multiple units. Background Art

[0002] The collector is the core component of solar thermal utilization. Common solar collectors include vacuum tube type, heat pipe type and flat plate type. Among them, the flat plate type solar collector has a simple structure and high heat collection efficiency. It is widely used in the field of domestic hot water. At present, the solar water heating system of high-rise buildings in my country mainly uses flat plate collectors. Flat plate solar collectors usually use copper tubes as circulation channels, but the price of copper is very high, which makes the material cost of the collector high. Some use full-channel stainless steel as the core of the heat absorption plate, that is, two stainless steel plates are welded together after stamping to form a circulation channel. This plate core has good heat exchange effect, but the pressure bearing capacity is poor, usually at 0.2MPa, which is not conducive to large-scale application in engineering. Some use aluminum as the circulation channel, but the corrosion resistance of the welding and welding points of the aluminum tube is poor, and there is a certain quality risk. Finding alternative materials for copper is an important way to reduce the cost of flat plate collectors. The diameter of the inlet and outlet pipes of conventional flat-plate solar collectors is about 22mm, and the number of series-connected units is generally less than 10. If a large-diameter collector is used, 50 or even more can be connected in series, greatly reducing the cost of pipes and installation. If copper pipes are used as large-diameter flow channels, the cost of the collector will increase significantly. Utility Model Content

[0003] The utility model provides a large-diameter stainless steel flat plate collector that can be connected in series with multiple units. The collector inlet and outlet are designed to be large-diameter, which has better feasibility and can realize multiple units in series, reduce the use of pipelines, reduce material and installation labor costs, and improve the thermal performance of the entire collector array.

[0004] The utility model is realized by the following technical solutions:

[0005] A large-caliber stainless steel flat plate collector capable of connecting multiple units in series, comprising a collector shell, a heat insulation layer is provided at the bottom of the inner cavity of the collector shell, and a stainless steel tube row composed of a plurality of stainless steel unit tubes arranged side by side is provided on the heat insulation layer;

[0006] The front and rear interfaces of the stainless steel tube row are respectively connected to stainless steel headers, and the left and right ends of the stainless steel headers respectively extend to the outside of the collector housing;

[0007] A heat absorbing plate is welded to the top surface of the stainless steel tube row, and a transparent cover plate for sealing the inner cavity of the collector shell is installed at the top end.

[0008] Further, the stainless steel unit tube is a square stainless steel tube, and a thermal conductive silicone grease layer is coated on the outer surface of the stainless steel unit.

[0009] Further, the stainless steel unit tube is a circular stainless steel tube, and a thermal conductive silicone grease layer is applied on the welding seam between the stainless steel unit and the heat absorption plate.

[0010] Further, the diameter of the stainless steel header is 50 - 80 mm.

[0011] Further, the collector housing is composed of an aluminum profile frame and a back plate.

[0012] Further, the surface of the heat absorption plate is covered with a blue film or a black film.

[0013] The beneficial effects achieved by the present utility model compared with the prior art are as follows:

[0014] 1. The front and rear interfaces of the stainless steel tube row are respectively connected to a stainless steel header, and the left and right ends of the stainless steel header respectively extend to the outside of the collector housing;

[0015] The present utility model uses stainless steel instead of copper as the circulation flow channel, which can significantly reduce the cost of the flow channel pipe and improve the economy of the collector. At the same time, due to the application of stainless steel materials, the header can adopt a large - diameter form, enabling the series connection of 50 or even more collectors, reducing the use of pipelines, saving materials and installation costs, while reducing pipeline heat loss and improving the thermal performance of the entire system. Thus, the economic efficiency of the system is improved;

[0016] 2. The stainless steel unit tube is a square stainless steel tube, and a thermal conductive silicone grease layer is coated on the outer surface of the stainless steel unit. The stainless steel unit tube is a circular stainless steel tube, and a thermal conductive silicone grease layer is applied on the welding seam between the stainless steel unit and the heat absorption plate, thereby increasing the thermal conductivity;

[0017] 3. The surface of the heat absorption plate is covered with a blue film or a black film, improving the heat absorption efficiency. Description of the Drawings

[0018] Figure 1 It is a front - view internal schematic diagram of the large - diameter stainless steel flat - plate collector described in the present utility model;

[0019] Figure 2 It is a left - view internal schematic diagram of the large - diameter stainless steel flat - plate collector described in the present utility model;

[0020] Figure 3 It is a schematic diagram of the cooperation between the heat absorption plate and the stainless steel tube row described in the present utility model;

[0021] In the figure: 1. Collector housing; 2. Stainless steel tube row; 3. Absorbing plate; 4. Transparent cover plate; 5. Heat insulation layer; 6. Stainless steel header; 7. Thermal grease layer. Specific embodiments

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying 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 scope of protection of the present application.

[0023] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "front", "rear", "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation of the present utility model.

[0024] As Figures 1-3 shown, this embodiment discloses a large-diameter stainless steel flat-plate collector that can be connected in series with multiple units, which is composed of a collector housing 1, a stainless steel tube row 2, an absorbing plate 3, a transparent cover plate 4, etc.

[0025] Among them, the collector housing 1 is assembled by an aluminum alloy profile frame and a backboard. A heat insulation layer 5 is assembled at the bottom of the inner cavity of the collector housing 1, and it uses glass wool or polyester cotton as the heat insulation material for the bottom surface and the surrounding, which is the same as that of a conventional flat-plate collector.

[0026] A stainless steel pipe row 2 composed of a plurality of stainless steel unit pipes arranged side by side is installed on the heat insulation layer 5. The stainless steel unit pipes can be square stainless steel pipes or round stainless steel pipes as needed. In this embodiment, a directional stainless steel pipe is selected, and the grade can be SUS304 to ensure corrosion resistance. The thickness is determined based on the pressure bearing capacity and cost, and can be between 0.6-2.0 mm. The front and rear interfaces of the stainless steel pipe row 2 are respectively connected with a stainless steel header 6, and the left and right ends of the stainless steel header 6 extend to the outside of the collector housing 1 respectively. The stainless steel header 6 uses a stainless steel round pipe of the same grade with a diameter of 50-80 mm. The stainless steel header 6 is cut with a circular hole or a square hole by laser cutting according to the external dimensions of the stainless steel pipe row 2. After the stainless steel pipe row 2 is inserted into the stainless steel header 6, it is connected by argon arc welding. The excess parts after the stainless steel pipe row 2 is inserted into the stainless steel header 6 are cut off at both ends to reduce the space occupied by the header section and avoid increasing the circulation resistance. The left and right ends of the stainless steel header 6 are respectively reserved with bare tubes or threads. Since the stainless steel header 6 has a large diameter, the stainless steel headers 6 between adjacent flat-plate collectors are connected by threading with silicone tubes or stainless steel corrugated tubes.

[0027] The heat absorbing plate 3 adopts a mature commercial aluminum plate, which is coated with a black film or a blue film to improve the heat absorption efficiency; the heat absorbing plate 3 and the stainless steel tube row 2 are laser welded; when a square stainless steel tube is used, a thin layer of thermal conductive silicone grease layer 7 can be coated on the surface of the square stainless steel tube in advance before welding to increase the thermal conductivity. When a round stainless steel tube is used, a thermal conductive silicone grease layer can be applied to the gap where the stainless steel tube contacts the heat absorbing plate 3 after welding to increase the thermal conductivity.

[0028] The top of the collector housing 1 is equipped with a transparent cover plate 4 that seals its inner cavity. The transparent cover plate 4 is made of low-iron ultra-white tempered glass. After the overall installation, the bottom surface, four corners, and the transparent cover plate 4 of the collector are sealed with special glue to prevent rainwater from entering the cavity and causing high temperature and high humidity corrosion of stainless steel. Exhaust holes are designed on the collector frame to discharge the steam in the cavity in time, so that the collector remains dry during operation, ensuring efficiency and reducing the risk of stainless steel corrosion.

[0029] The large-caliber stainless steel flat plate collector proposed in the utility model uses SUS304 stainless steel instead of copper as the circulation channel, which can significantly reduce the cost of using the channel pipe and improve the economy of the collector. At the same time, due to the application of stainless steel materials, the stainless steel header 6 can be in a large-caliber form, so that 50 or even more collectors can be connected in series, which can reduce the use of pipelines, save materials and installation costs, and reduce pipeline heat loss, thereby improving the thermal performance of the entire system. Thereby achieving the effect of improving the economy of the system.

Claims

1. A large-caliber stainless steel flat plate collector that can be connected in series, characterized in that: It comprises a collector shell, wherein the inner cavity bottom of the collector shell is provided with a heat insulation layer, and a stainless steel tube row composed of a plurality of stainless steel unit tubes arranged side by side is provided on the heat insulation layer; The front and rear interfaces of the stainless steel tube row are respectively connected to stainless steel headers with a diameter of 50-80 mm, and the left and right ends of the stainless steel headers extend to the outside of the collector housing respectively; A heat absorbing plate is welded on the top surface of the stainless steel tube row, and a transparent cover plate for sealing the inner cavity of the collector housing is installed on the top of the collector housing; The stainless steel unit tube is a square stainless steel tube, and the outer surface of the stainless steel unit is coated with a thermal conductive silicone grease layer. Alternatively, the stainless steel unit tube is a round stainless steel tube, and a thermal conductive silicone grease layer is applied to the welding gap between the stainless steel unit and the heat absorbing plate.

2. The large-diameter stainless steel flat plate collector according to claim 1, characterized in that: The collector shell is composed of an aluminum profile frame and a back plate.

3. The large-caliber stainless steel flat plate collector according to any one of claims 1-2, characterized in that: The surface of the heat absorbing plate is covered with a blue film or a black film.

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