An inflatable CPC collector device

Abstract

This patent discloses an inflatable CPC collector device, including a straight-through vacuum collector tube, an inflatable CPC collector tube support frame, and a double-chamber airbag with a CPC reflector; the straight-through vacuum collector tube is fixed on the inflatable CPC collector tube support frame, and the end of the straight-through vacuum collector tube is sealed and connected with the end of the inflatable CPC collector tube support frame through a sealing ring; the double-chamber airbag with the CPC reflector is outside the inflatable CPC collector tube support frame and supported by the inflatable CPC collector tube support frame, and the two ends of the double-chamber airbag with the CPC reflector are respectively sealed and connected with the two ends of the inflatable CPC collector tube support frame. The device is convenient for adjusting the CPC reflective film curve, direction, etc., reducing heat loss, and ensuring that the CPC collector has a high solar heat collection efficiency. The CPC collector device is easy to clean and maintain, has a long service life, is easy to assemble and disassemble, easy to store and transport, and has a simple structure, light weight, and low cost.

Description

Technical Field

[0001] The invention relates to a solar energy heat collecting device, in particular to an inflatable CPC heat collecting device, belonging to the technical field of solar energy utilization. Background Art

[0002] As a clean, pollution-free renewable energy, the development and utilization of solar energy is considered an important part of the world's energy strategy. Solar water heaters have been successfully commercialized, and how to more effectively utilize solar energy has become a topic of research for scientists from all over the world.

[0003] Compound parabolic concentrator (CPC) is a non-imaging concentrator designed based on the principle of edge optics. In theory, the incident light within the receiving angle range will eventually reach the receiver directly or after reflection. For a given receiving angle range, it can achieve the maximum concentration ratio, so it is used in solar thermal and photovoltaic systems, non-tracking and tracking (secondary reflector) systems. CPC collectors have a smaller heat dissipation area, do not require tracking devices, and reduce costs, and can meet the needs of medium and high temperature heat collection.

[0004] At present, CPC solar medium and low temperature collectors have been promoted and applied to a certain extent. Compared with ordinary solar low temperature collectors, they can improve the collection temperature and collection efficiency within a certain range. However, the current CPC collectors have the following problems that limit the further promotion and application of CPC collectors: 1. CPC reflectors are generally exposed to the air and often fall into dust and debris, blocking the collection of solar energy. One of the main advantages of CPC non-tracking concentrating collectors over tracking collectors is that they are easy to maintain. Frequent cleaning will affect this advantage. CPC reflectors in the air and scrubbing will gradually reduce the reflectivity of the reflectors, and the performance of solar collectors decays rapidly; 2. The reflectors of CPC collectors generally require metal support frames. In order to ensure the accuracy of focusing and the stability of the bracket, The support device requires a certain amount of steel, which makes the CPC collector heavy and costly, and is not convenient for transportation and storage; 3. CPC collectors are generally fixed, and the brackets used cannot adjust the angle of the collector. Since the altitude of the sun changes seasonally throughout the year, in order to improve the concentration ratio and utilization rate of solar energy, CPC collector brackets with multiple reserved holes have appeared on the market. The inclination angle of the CPC collector is adjusted by changing the reserved holes for fixing. However, the structure of this type of device is relatively complex, which increases the cost and cannot be adjusted continuously; 4. Due to factors such as processing errors and on-site installation errors, the CPC reflector needs to be adjusted to achieve the ideal focusing effect, but the current CPC reflector cannot adjust its curve shape after installation. Summary of the invention

[0005] The object of the present invention is to overcome the defects of the above-mentioned existing related CPC solar collectors and to provide a CPC solar collector which is easy to adjust the curve and orientation of the CPC reflective film, easy to clean and maintain, has low heat loss, long service life, is easy to store and transport, has a simple structure, is light in weight and has low cost.

[0006] In order to solve the above technical problems, the technical solution provided by this patent is as follows: an inflatable CPC collector device is adopted, including a straight-through vacuum collector tube, an inflatable CPC collector tube support frame, and a double-cavity airbag with a CPC reflector; the straight-through vacuum collector tube is fixed on the inflatable CPC collector tube support frame, and the end of the straight-through vacuum collector tube is sealed and connected to the end of the inflatable CPC collector tube support frame through a sealing ring; the double-cavity airbag with the CPC reflector is outside the inflatable CPC collector tube support frame and supported by the inflatable CPC collector tube support frame, and the two ends of the double-cavity airbag with the CPC reflector are respectively sealed and connected to the two ends of the inflatable CPC collector tube support frame.

[0007] As an improvement of the present invention, the inflatable CPC collector tube support frame includes a rotatable support ring, an upper connecting rod, a lower connecting rod, an L-shaped fixing block, a rotatable support ring base, and a fixed plug rod; the rotatable support ring is an annular structure with a groove on the circumference, and a reserved hole is provided on the rotatable support ring; the rotatable support ring is placed vertically, and the upper and lower ends of the two rotatable support rings are respectively connected to the two ends of the upper connecting rod and the lower connecting rod through the L-shaped fixing block; the upper part of the rotatable support ring base is a semi-annular structure adapted to the rotatable support ring, and the semi-annular structure is provided with a reserved hole, and the lower part of the rotatable support ring base is an inclined support leg, and the fixed plug rod is inserted into the reserved hole of the rotatable support ring and the reserved hole of the rotatable support ring base.

[0008] As an improvement of the present invention, the double-chamber airbag with a CPC reflective plate includes an upper light-transmitting film, a lower airbag film, a CPC reflective film, an upper inflation hole, a lower inflation hole, and an end sealing film. The CPC reflective film is a reflective film using a compound parabolic concentrator curved surface. The upper light-transmitting film, the CPC reflective film and the end sealing film form an upper air cavity. The lower airbag film, the CPC reflective film and the end sealing film form a lower air cavity. Both the upper air cavity and the lower air cavity are closed spaces. The upper light-transmitting film is provided with an upper inflation hole, and the lower airbag film is provided with a lower inflation hole. The end sealing film is sealingly connected to a rotating support ring. The top of the upper light-transmitting film is fixedly connected to an upper connecting rod, and the middle of the CPC reflective film is fixedly connected to a lower connecting rod.

[0009] As an improvement of the present invention, the upper light-transmitting film and the CPC light-reflecting film are respectively connected to the upper connecting rod and the lower connecting rod through nylon adhesive or a sleeve structure.

[0010] As an improvement of the present invention, the CPC reflective film is a reflective aluminum film.

[0011] As an improvement of the present invention, the upper light-transmitting film is made of PET material.

[0012] As an improvement of the present invention, the gas in the upper air cavity and the lower air cavity is an inert gas.

[0013] Compared with the prior art, the advantages of the present invention are as follows: 1) The device adopts a soft reflective film + double airbag design. The reflective film is supported by the airbag, eliminating the metal support frame with complex structure, heavy weight and high cost. Compared with the traditional CPC collector, it can significantly save materials and reduce costs, and is convenient for rotation adjustment, storage and transportation. 2) The device can adjust the curve shape of the CPC reflective film by controlling the air pressure of the upper and lower air cavities to adjust the focusing characteristics of the CPC collector to achieve the best solar energy collection effect. 3) The designed CPC collector tube support frame has a simple structure and can conveniently adjust the lighting angle of the CPC collector to adapt to different times and seasons to achieve the maximum amount of solar energy lighting. 4) The airbag is filled with inert gas with low thermal conductivity to reduce heat transfer and improve the thermal utilization efficiency of the collector. 5) The assembled structure is easy to replace and maintain. When not in use for a long time, the reflective film and airbag device can be deflated and stored. 6) CPC reflective film is located in the airbag for a long time to prevent dust and debris from falling into it, which may cause the CPC reflective plate to be difficult to clean and maintain, have a short life, and have a fast attenuation of light-collecting performance. 7) The device has good adjustable performance, which is convenient for adjusting the curve and direction of the CPC reflective film, thereby increasing the amount of light collected by the CPC collector; CPC collectors are easy to clean and maintain, and have a long service life; they are easy to assemble and disassemble, store and transport; they have less heat loss, simple structure, light weight, low cost, and beautiful style, and have good promotion potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of an inflatable CPC collector device;

[0015] Figure 2 It is a structural schematic diagram of the inflatable CPC collector tube support frame;

[0016] Figure 3 is a cross-sectional view of a dual-chamber airbag with a CPC reflector;

[0017] Among them: 1 is a straight-through vacuum collector tube, 2 is an inflatable CPC collector tube support frame, 3 is a double-cavity air bag with a CPC reflective plate, 4 is a sealing ring, 5 is a rotating support ring, 6 is an upper connecting rod, 7 is a lower connecting rod, 8 is an L-shaped fixing block, 9 is a rotating support ring base, 10 is a fixed plug rod, 11 is an upper light-transmitting film, 12 is a lower air bag film, 13 is a CPC reflective film, 14 is an upper inflation hole, 15 is a lower inflation hole, 16 is an end sealing film, 17 is an upper air cavity, and 18 is a lower air cavity. DETAILED DESCRIPTION

[0018] In order to enhance the understanding and recognition of the present invention, the present invention is further described and illustrated below in conjunction with the accompanying drawings and specific implementation methods.

[0019] Example 1: See Figure 1-Figure 2 An inflatable CPC collector device is adopted, including a straight-through vacuum collector tube 1, an inflatable CPC collector tube support frame 2, and a double-cavity airbag 3 with a CPC reflector; the straight-through vacuum collector tube 1 is fixed on the inflatable CPC collector tube support frame 2, and the end of the straight-through vacuum collector tube 1 is sealed and connected to the end of the inflatable CPC collector tube support frame 2 through a sealing ring 4; the double-cavity airbag 3 with a CPC reflector is outside the inflatable CPC collector tube support frame 2 and supported by the inflatable CPC collector tube support frame 2, and the two ends of the double-cavity airbag 3 with the CPC reflector are respectively sealed and connected to the two ends of the inflatable CPC collector tube support frame 2.

[0020] Example 2: See Figure 1-Figure 2 As an improvement of the present invention, the inflatable CPC collector tube support frame 2 includes a rotatable support ring 5, an upper connecting rod 6, a lower connecting rod 7, an L-shaped fixing block 8, a rotatable support ring base 9, and a fixed plug rod 10; the rotatable support ring 5 is an annular structure with a groove on the circumference, and a reserved hole is provided on the rotatable support ring 5; the rotatable support ring 5 is placed vertically, and the upper and lower ends of the two rotatable support rings 5 ​​are respectively connected to the two ends of the upper connecting rod 6 and the lower connecting rod 7 through the L-shaped fixing block 8; the upper part of the rotatable support ring base 9 is a semi-annular structure adapted to the rotatable support ring 5, and 8 reserved holes are provided on the semi-annular structure, and the lower part of the rotatable support ring base 9 is an oblique support leg, and the fixed plug rod 10 is inserted into the reserved holes of the rotatable support ring 5 and the reserved holes of the rotatable support ring base 9.

[0021] Example 3: See Figure 1-Figure 3As an improvement of the present invention, the double-chamber airbag 3 with CPC reflective plate comprises an upper light-transmitting film 11, a lower airbag film 12, a CPC reflective film 13, an upper inflation hole 14, a lower inflation hole 15, and an end sealing film 16. The CPC reflective film 13 is a reflective film using a compound parabolic concentrator surface. The upper light-transmitting film 11, the CPC reflective film 13 and the end sealing film 16 form an upper air cavity 17. The lower airbag film 12, the CPC reflective film 13 and the end sealing film 16 form a lower air cavity 18. The upper air cavity 17 and the lower air cavity 18 are both closed spaces. The upper light-transmitting film 11 is provided with an upper inflation hole 14, and the lower airbag film 12 is provided with a lower inflation hole 15. The end sealing film 16 is sealed and connected to the rotating support ring 5. The top of the upper light-transmitting film 11 is fixedly connected to the upper connecting rod 6, and the middle of the CPC reflective film 13 is fixedly connected to the lower connecting rod 7. The upper transparent film 11 and CPC reflective film 13 are connected to the upper connecting rod 6 and the lower connecting rod 7 through sleeves. The CPC reflective film 13 is made of reflective aluminum film, the upper transparent film 11 is made of PET material, and the gas in the upper air cavity 17 and the lower air cavity 18 is inert gas.

[0022] Working principle and process: see Figure 1-Figure 3 The upper air cavity 17 can be inflated through the upper air hole 14, and the lower air cavity 18 can be inflated through the lower air hole 15. By adjusting the air pressure of the upper air cavity 17 and the lower air cavity 18, the curvature of the CPC reflective film 13 can be adjusted to adjust the CPC's focusing effect. Sunlight passes through the high-transmittance upper light-transmitting film 11, part of which is irradiated onto the straight-through vacuum heat collecting tube 1, and part of which is irradiated onto the CPC reflective film 13. After reflection, it is irradiated onto the vacuum heat collecting tube 1 to heat the medium in the heat collecting tube. CPC reflection can reflect all sunlight within a certain angle onto the vacuum heat collecting tube 1. When the position of the sun changes with time or season, in order to maximize the use of solar energy, the inflatable CPC collector tube support frame 2 and the double-chamber airbag 3 with CPC reflector can be rotated by rotating the rotating support ring 5. When adjusted to a suitable position, the fixing rod 10 is inserted into the rotating support ring base 9 and the reserved holes on the rotating support ring base 9 to fix it, so as to change the direction of CPC. The double-chamber airbag 3 with CPC reflector can be replaced and stored by deflation through the upper inflation hole 14 and the lower inflation hole 15.

[0023] The present invention may also combine at least one of the technical features described in Examples 2 and 3 with Example 1 to form a new implementation manner.

[0024] It should be noted that the above embodiments are merely preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. An inflatable CPC collector device, characterized in that The inflatable CPC collector device comprises a straight-through vacuum collector tube, an inflatable CPC collector tube support frame, and a double-chamber airbag with a CPC reflector; the straight-through vacuum collector tube is fixed on the inflatable CPC collector tube support frame, and the end of the straight-through vacuum collector tube is sealed and connected to the end of the inflatable CPC collector tube support frame through a sealing ring; the double-chamber airbag with a CPC reflector is outside the inflatable CPC collector tube support frame and supported by the inflatable CPC collector tube support frame, and the two ends of the double-chamber airbag with a CPC reflector are respectively sealed and connected to the two ends of the inflatable CPC collector tube support frame; The inflatable CPC collector tube support frame includes a rotating support ring, an upper connecting rod, a lower connecting rod, an L-shaped fixing block, a rotating support ring base, and a fixed plug rod; the rotating support ring is an annular structure with a groove on the circumference, and a reserved hole is provided on the rotating support ring; the rotating support ring is placed vertically, and the upper and lower ends of the two rotating support rings are respectively connected to the two ends of the upper connecting rod and the lower connecting rod through the L-shaped fixing block; the upper part of the rotating support ring base is a semi-annular structure adapted to the rotating support ring, and a reserved hole is provided on the semi-annular structure, and the lower part of the rotating support ring base is an oblique support leg, and the fixed plug rod is inserted into the reserved hole of the rotating support ring and the reserved hole of the rotating support ring base; The double-cavity airbag with CPC reflective plate comprises an upper light-transmitting film, a lower airbag film, a CPC reflective film, an upper inflation hole, a lower inflation hole, and an end sealing film. The CPC reflective film is a reflective film using a compound parabolic concentrator curved surface. The upper light-transmitting film, the CPC reflective film and the end sealing film form an upper air cavity. The lower airbag film, the CPC reflective film and the end sealing film form a lower air cavity. Both the upper air cavity and the lower air cavity are closed spaces. The upper light-transmitting film is provided with an upper inflation hole, and the lower airbag film is provided with a lower inflation hole. The end sealing film is sealingly connected to a rotating support ring. The top of the upper light-transmitting film is fixedly connected to an upper connecting rod, and the middle of the CPC reflective film is fixedly connected to a lower connecting rod.

2. The inflatable CPC collector device according to claim 1, characterized in that The number of the reserved holes on the rotating support ring is 2 to 10.

3. The inflatable CPC collector device according to claim 1, characterized in that The upper light-transmitting film and CPC light-reflecting film are respectively connected with the upper connecting rod and the lower connecting rod through nylon adhesive or sleeves.

4. The inflatable CPC collector device according to claim 1, characterized in that The CPC reflective film is made of reflective aluminum film.

5. The inflatable CPC collector device according to claim 1, characterized in that The upper light-transmitting film is made of PET material.

6. The inflatable CPC collector device according to claim 1, characterized in that The gas in the upper air cavity and the lower air cavity is an inert gas.

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