Vacuum pylon ecological photovoltaic system and preparation method thereof

Abstract

The application discloses a vacuum mound ecological photovoltaic system and a preparation method thereof, relates to the field of modern agricultural equipment and desertification prevention technology, and aims to solve the problems of high transportation and manufacturing cost of traditional photovoltaic supports, farmland destruction, complex construction and the like. The system fills on-site sand with a flexible sealing bag, seals after being pumped to a vacuum degree of above-0.06 MPa, forms a rigid vacuum soil mound and is used as a photovoltaic support. The application is suitable for agricultural and photovoltaic complementary and ecological restoration scenes such as farmland, orchard, desert and abandoned land, and has the advantages of local material, fast construction, ecological friendliness, wind resistance, sand control by photovoltaic, and more than 80% reduction of support cost.

Description

Technical Field

[0001] This invention relates to the field of modern agricultural equipment and agro-photovoltaic complementary technology, specifically to a vacuum soil mound photovoltaic support ecological photovoltaic power generation system that uses locally sourced materials, is low-cost, and eco-friendly, and its vacuum soil mound photovoltaic support preparation method. It is suitable for farmland, orchards, deserts, abandoned land and other scenarios, and can completely replace traditional metal and concrete photovoltaic supports, thereby significantly reducing the construction cost of agro-photovoltaic complementary systems and reducing the construction cost of high-standard farmland. Background Technology

[0002] Currently, constructing photovoltaic power stations in arable land, orchards, desertified land ecological restoration areas, and facility agriculture areas to achieve agricultural-solar complementarity and significantly improve the output efficiency per unit of land is an important direction for green agricultural development. However, the photovoltaic brackets used in current agricultural-solar complementarity systems generally adopt metal brackets (such as...). Figure 6 (as shown in the image) or concrete supports. For example, the applicant's prior patent "Swinging Wind-Resistant Stable Power Generation Agricultural Photovoltaic Complementary System (CN120658176B)" uses PHC prestressed pipe piles. Such existing photovoltaic supports consist of seven parts: columns, beams, purlins, diagonal braces, pressure blocks, fasteners, and foundations. They have the following obvious application pain points.

[0003] Firstly, the transportation costs in agricultural settings are extremely high: metal and concrete supports need to be transported long distances from other places to fields, orchards, mountains, deserts, and other areas, with transportation distances reaching hundreds or even thousands of kilometers. The high proportion of transportation costs significantly increases the construction costs of agricultural photovoltaic complementary projects, which is not conducive to the widespread application by small farmers, family farms, and cooperatives.

[0004] Secondly, the manufacturing cost is too high and does not match the economic benefits of agriculture: metal supports require cutting, welding, and corrosion protection; concrete supports require on-site pouring and curing, which are complex processes and consume a large amount of materials. In 2025, the average winning bid price for photovoltaic supports in China reached 0.25 yuan / watt (excluding installation), far exceeding the cost range that agricultural facilities can afford.

[0005] Third, it damages farmland ecology and farming conditions: metal production causes significant pollution, concrete pouring consumes a lot of water and damages the soil layer of arable land, and the construction of support foundations disturbs the soil and damages the root system, which does not meet the requirements of ecological agriculture, arable land protection, and sustainable farming.

[0006] Fourth, the construction is complicated and affects the farming season: Traditional supports need to be assembled / cast on site, which takes a long time and involves many procedures. This can easily delay key farming seasons such as sowing, irrigation and harvesting, which is in stark contrast to the demand of modern agriculture for efficiency, convenience and timely operation.

[0007] To address the aforementioned issues, there is an urgent need for a photovoltaic support technology that is compatible with modern agriculture, desertification control, utilizes local materials, is low-cost, eco-friendly, quick to construct, and applicable to the field of agricultural-solar complementary systems. Summary of the Invention

[0008] One of the objectives of this invention is to overcome the shortcomings of existing agricultural-solar complementary photovoltaic supports, such as long transportation distances, high costs, damage to arable land, slow construction, and impact on farming. This invention provides an ecological photovoltaic power generation system adapted to agricultural-solar complementary systems, specifically a vacuum soil mound photovoltaic support and its preparation method (hereinafter referred to as the vacuum mound photovoltaic system and its preparation method). This system overcomes the defects of existing supports by using vacuum negative pressure to consolidate sand and soil filler to form a high-strength rigid mound, achieving on-site fabrication, extremely low cost, rapid construction, ecological and environmental protection, and typhoon-resistant stable support, thereby reducing the construction cost of high-standard farmland.

[0009] The second objective of this invention is to provide a method for manufacturing a vacuum support frame, overcoming the defects of existing supports.

[0010] To achieve one of the above objectives, the present invention provides a vacuum pier ecological photovoltaic system, as detailed below.

[0011] A vacuum pier ecological photovoltaic system includes a photovoltaic support frame and photovoltaic panels installed on the photovoltaic support frame. The photovoltaic support frame comprises an airtight (and aging-resistant) flexible bag (commonly known as a bag), filled with one or more sand-soil fillers selected from sand, soil, and gravel, and is vacuumed and sealed, maintaining a negative pressure of -0.10 MPa to -0.06 MPa inside the bag. Under vacuum negative pressure, the bag and sand-soil filler are compressed into (e.g., a rigid vacuum pier with a relative density ≥70%, dry density ≥1.61 g / cm³, and unconfined compressive strength ≥180 kPa) axles (e.g., a rectangular, cylindrical, or prismatic solidified body of sand-soil filler weighing several hundred to several thousand kilograms). The vacuum piers serve as columns, foundations, or overall support structures for the photovoltaic support frame; in other words, the vacuum piers can be used directly as photovoltaic support frames or as core components of the photovoltaic support frame.

[0012] Furthermore, the bag body is equipped with an exhaust port (preferably with an air valve) for venting during filling or for replenishing the vacuum after a drop in vacuum level. The exhaust port ensures smooth filling of the sand and soil filler, facilitates later maintenance, guarantees the structural stability of the vacuum soil mound, and prevents deformation and collapse of the support structure due to insufficient vacuum level.

[0013] Furthermore, the sand and soil filler is a mixture of one or more locally sourced sand, gravel, and soil, which is compacted after being packed into bags. This setup can flexibly adapt to resource conditions in different scenarios, especially in desert areas where desert sand can be directly sourced locally without the need for additional sand and soil raw materials, further reducing costs; in fields, it can be prepared using local soil and gravel mixtures, demonstrating strong adaptability.

[0014] Furthermore, the photovoltaic panels are secured to the vacuum soil mound using straps (including ropes, straps, cords, binding straps, such as wire, rolled strips, etc.) or tensioned to the mound using rods (tensioners, braces, struts, connecting rods, such as steel bars, iron bars, etc.); alternatively, the photovoltaic panels are fixed to a crossbeam, which is then secured to the vacuum soil mound using straps or tensioned to the mound. The straps should be flexible, securely fastened, and low-cost, adaptable to the surface morphology of the vacuum soil mound, ensuring stable installation of the photovoltaic panels while preventing damage to the mound. The straps should also be readily available locally or easily prepared to further control costs. The elongation of the tension rods is less than 0.5%, minimizing elongation deformation after tensioning and maintaining the photovoltaic panel's installation tilt angle and tension stability over a long period.

[0015] Furthermore, the vacuum soil mounds can be placed in farmland, orchards, deserts, abandoned land, or field edges without occupying the high-quality arable layer or changing the agricultural use of the land, thus achieving dual use of the land and coexistence of agriculture and electricity.

[0016] Furthermore, padding is provided between the cable straps and the bag body and / or between the photovoltaic panel (e.g., crossbeams, frames, back of photovoltaic panels, etc.) and the bag body to prevent the bag body from being worn through, so as to prevent the vacuum soil mound from leaking air and losing pressure and collapsing.

[0017] Furthermore, the lower end of the vacuum soil pier is buried 50mm to 1500mm below the ground surface to serve as a pre-embedded foundation, thereby strengthening the foundation and enhancing its anti-sliding and anti-overturning stability.

[0018] Furthermore, a group of the photovoltaic arrays is supported and fixed by multiple vacuum soil blocks, with each vacuum soil block serving as a backup for the others. In this way, even if one of the vacuum soil blocks in the group accidentally breaks, the other vacuum soil blocks will still function, preventing the entire photovoltaic array on it from collapsing.

[0019] Furthermore, a desiccant and / or insecticide are placed inside the bag or vacuum mound to prevent insects such as ants from biting through the bag.

[0020] Furthermore, multiple photovoltaic panels form a photovoltaic array, and the vacuum soil mound below the photovoltaic array is a windbreak-type sand-blocking structure (different from the ventilation structure of traditional photovoltaic supports); multiple photovoltaic arrays (arranged according to windbreak layout) form a photovoltaic windbreak matrix; the vacuum soil mound has the dual functions of photovoltaic support and windbreak and sand-blocking (realizing the integration of photovoltaic support and windbreak and sand fixation), which can block the movement of wind and sand and reduce the surface wind speed, and is used in desert photovoltaic sand control scenarios.

[0021] Furthermore, the vacuum soil mounds form the walls of agricultural greenhouses such as those for vegetables and edible fungi, while the photovoltaic arrays form the greenhouse roof. This allows the vacuum soil mounds to function as both greenhouse walls and photovoltaic supports, and the photovoltaic arrays to function as both greenhouse roofs and photovoltaic power generation, achieving structural reuse, functional integration, and multi-purpose use of a single material. It is important to emphasize that using vacuum soil mounds and photovoltaic arrays to construct agricultural greenhouses for vegetables and edible fungi achieves three benefits at once with extremely low overall cost: a single photovoltaic project investment yields three core benefits simultaneously: First, continuous production of clean electricity, resulting in stable power generation revenue and energy self-sufficiency; second, obtaining standardized agricultural greenhouses at zero incremental cost, eliminating the need for investment in traditional greenhouse walls, frames, and foundations; and third, free desertification control and ecological restoration, with the vacuum soil mounds blocking wind and sand, and the photovoltaic panels providing shade and moisture retention, simultaneously improving water and heat conditions in sandy areas and creating a stable environment for plant growth. The overall solution eliminates redundant construction, additional material consumption, off-site transportation, and ecological damage. It simultaneously meets the three major goals of photovoltaic power generation, agricultural production, and ecological restoration with a single system, significantly improving investment efficiency. The overall cost is far lower than the individual construction costs of traditional photovoltaic power stations, traditional agricultural greenhouses, and traditional desertification control projects, providing a low-cost, replicable, and sustainable integrated solution for agricultural-photovoltaic complementarity and ecological restoration in desert and Gobi areas.

[0022] To achieve the second objective mentioned above, the present invention provides a method for preparing a vacuum support frame, the specific process steps of which are as follows.

[0023] A method for manufacturing a vacuum support frame, characterized by comprising the following process steps: S1. Excavate a pit or level the ground at a designated location on the ground; S2. Place a template of a predetermined shape in the pit or on the ground; S3. Place the flexible bag into the template; S4. Inflate the flexible bag with air to make it bulge and fit tightly against the inner wall of the template; S5. Inject sand filler into the bulging flexible bag from the bag opening, and simultaneously expel excess air from the bag until the sand filler fills the predetermined position. S6. Seal the opening of the flexible bag; S7. Air is extracted from the bag through the exhaust port of the flexible bag, so that the flexible bag and the sand filler are squeezed together under vacuum negative pressure to form a vacuum mound. S8. Close the exhaust port; S9. Remove the template and leave the vacuum soil mound in place to be used as a column, foundation or overall support structure for photovoltaic brackets.

[0024] Furthermore, the vacuum support frame preparation method includes any one of the following steps ① to ⑥: ① Connect the exhaust port to the air valve, and close the exhaust port by closing the air valve; ②The sand and soil filler material is sourced locally, first placed into bags, and then compacted by vibration; ③ Place the vacuum soil mound in farmland, orchard, desert, abandoned land or field edges; ④ Bury the lower end of the vacuum soil mound into a pit 50mm to 1500mm below the ground surface; ⑤ Place a desiccant and / or insecticide into the vacuum soil mound; ⑥ Use the vacuum soil mounds to construct greenhouse walls, so that the vacuum soil mounds have the dual functions of greenhouse walls and photovoltaic supports.

[0025] Compared with existing technologies, this invention has significant beneficial effects in adapting to modern agriculture and desert ecological management.

[0026] Firstly, it significantly reduces the construction cost of agricultural-solar complementary projects: using local sand and soil from fields and deserts as raw materials, only lightweight and small flexible bags need to be transported, which can save more than 95% of long-distance transportation costs, fundamentally solving the problem of high transportation costs for traditional photovoltaic brackets in remote areas such as fields and deserts.

[0027] Secondly, the manufacturing cost is extremely low: This invention only requires a sealed bag, on-site sand, and simple vacuum equipment, eliminating the need for complex processes such as cutting, welding, and casting, thus significantly reducing manufacturing and construction costs. Calculations show that replacing traditional photovoltaic brackets with vacuum soil blocks can reduce costs to 0.048 yuan / watt, a reduction of over 80.8%. With the average price of photovoltaic panels already down to 0.7 yuan / watt, manufacturers' profit per watt is only 0.05 yuan. This meager profit margin means that conventional cost reduction and efficiency improvement methods are no longer sufficient to achieve a breakthrough in cost reduction, and the industry is stuck in a cost-reduction bottleneck. Against this backdrop, this invention takes a different approach, abandoning the existing traditional photovoltaic brackets and using vacuum soil blocks to replace the original bracket structure. This achieves a significant cost reduction breakthrough that is difficult for component manufacturers in the industry to match, reducing costs by 0.2 yuan per watt, breaking the existing cost-reduction dilemma in the photovoltaic industry, and providing a brand-new low-cost solution for photovoltaic project construction.

[0028] Thirdly, the construction is quick and does not interfere with the farming season: the production process is simple, requiring only three steps: filling with sand, vacuuming, and sealing to form a photovoltaic support frame. There is no need for complicated on-site construction, which greatly shortens the construction period and does not affect key farming seasons such as sowing, irrigation, and harvesting.

[0029] Fourth, protecting arable land and agricultural ecology: It does not consume non-renewable resources such as steel and cement, does not damage the topsoil, does not disturb animal roots, and does not pollute the soil. The bags can be made of biodegradable materials, which is in line with the requirements of ecological agriculture, green farmland and arable land protection policies.

[0030] Fifth, it is perfectly adapted to agro-photovoltaic complementary planting: the height, spacing, tilt angle and weight of the vacuum soil mounds can be flexibly adjusted to provide a suitable growing environment for rice, vegetables, fruit trees, Chinese medicinal herbs, etc. It is compatible with different specifications of photovoltaic panels and various scenarios such as deserts, fields, and abandoned land, and has a wide range of applications.

[0031] Sixth, easy maintenance: the bag can be vacuumed at any time through the exhaust port to restore strength, and the pier can be quickly rebuilt on the spot if it is damaged, without affecting the continuity of agricultural production and power generation.

[0032] Seventh, the structure is reliable and stable: after being compacted by negative pressure, the vacuum soil mound has a relative density of ≥70%, a dry density of ≥1.61g / cm³, and an unconfined compressive strength of ≥180kPa, forming a rigid whole that can directly replace traditional supports and has excellent resistance to typhoons, overturning, and sliding.

[0033] Eighth, it also has ecological functions in photovoltaic desertification control: This invention is applicable to desert photovoltaic desertification control scenarios. The array of vacuum soil mounds acts like a series of continuous windbreaks, which can effectively block the movement of wind and sand, reduce surface wind speed, reduce sand erosion and photovoltaic panel burial, and realize the integration of engineering sand fixation, biological sand fixation and photovoltaic support. It has the dual functions of structural support and windbreak sand fixation, achieving multiple effects of windbreak sand fixation, water and soil conservation, ecological restoration and clean power generation, significantly improving the comprehensive benefits of photovoltaic desertification control and helping the ecological restoration of desertified land.

[0034] Ninth, effectively reducing the construction cost of high-standard farmland: Currently, the construction of national high-standard farmland is progressing in an orderly manner. Land leveling and debris removal are key links in the construction process, and also the main pain points restricting construction efficiency and driving up construction costs. High-standard farmland has high requirements for land leveling and soil purity. During construction, the land needs to be fully leveled, and debris such as stones and gravel needs to be removed from the soil one by one. Moreover, the removed debris needs to be transported separately to designated locations for stockpiling or disposal, which not only consumes a lot of manpower, material resources and transportation costs, but may also pose environmental hazards due to the stockpiling of debris, which is contrary to the concept of green and low-carbon modern agricultural development. This invention takes a different approach, realizing the on-site digestion of debris and turning waste into treasure, fundamentally solving the problem of debris disposal in the construction of high-standard farmland. In the process of high-standard farmland construction, this invention can directly use the removed debris as filler, fill it into airtight, aging-resistant flexible sealing bags, and after vacuum sealing, make rigid vacuum soil mounds. This approach eliminates the need for long-distance transportation and additional processing of stones, significantly reducing manpower and transportation costs in the land leveling process, and directly lowering the overall cost of high-standard farmland construction. In summary, this invention not only solves the problem of time-consuming, labor-intensive, and costly stone processing in high-standard farmland construction, but also promotes resource recycling and green development, providing an efficient, economical, and environmentally friendly solution for high-standard farmland construction, and contributing to the high-quality development of green, low-carbon, and modern agriculture.

[0035] Experimental and mechanistic studies have shown that atmospheric pressure sandbags are unsuitable for use as photovoltaic foundations. Atmospheric pressure sandbags are loose aggregates with no consolidated strength or overall stability. They soften when exposed to water, are prone to slippage under stress, and cannot withstand wind loads and overturning moments. Furthermore, sandbags are easily damaged by expansion under stress, resulting in high maintenance costs and short service life. In contrast, the vacuum soil pier of this invention forms a continuous, rigid whole with mechanical properties close to concrete. It utilizes locally sourced materials, is molded in one piece, is resistant to aging and freeze-thaw cycles, and its lifespan matches that of the photovoltaic system. It is superior to atmospheric pressure sandbags in terms of scientific mechanism, engineering cost, structural stability, and durability, and can safely and reliably replace traditional photovoltaic support foundations. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a sloping-top vacuum soil pier and the photovoltaic panels installed on it, according to the present invention.

[0037] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure at position AB.

[0038] Figure 3 This is a schematic diagram of the structure of an opaque bag filled with air according to the present invention.

[0039] Figure 4 This is a schematic diagram of the structure of a transparent rectangular vacuum soil mound in this invention.

[0040] Figure 5 This is a schematic diagram of an opaque cylindrical vacuum soil mound and a photovoltaic panel with the optimal tilt angle installed on it, according to the present invention.

[0041] Figure 6 This is a schematic diagram of the structure of a current photovoltaic array, its photovoltaic support structure, and photovoltaic panels.

[0042] Figure 7 for Figure 6 A schematic diagram of the structure after the columns, beams, diagonal braces, foundations, and other components of the current photovoltaic support system are replaced by vacuum soil blocks.

[0043] Figure 8 This is a schematic diagram illustrating the application of the protective pad between the bag body and the cable straps in this invention.

[0044] Figure 9 This is a schematic diagram of the structure of a bucket-shaped bag (i.e., a flattened container) in this invention.

[0045] Figure 10 This is a schematic diagram of the structure of a template used in this invention.

[0046] Figure 11 This is a schematic diagram illustrating the application of photovoltaic arrays and vegetables in the photovoltaic complementary technology of this invention.

[0047] Figure 12 This is a schematic diagram of the structure in which the vacuum soil mound and photovoltaic array constitute a windbreak and sand-blocking structure and are arranged into a photovoltaic windbreak matrix.

[0048] Figure 13 This is a schematic diagram of an E-shaped vacuum soil mound in this invention.

[0049] Figure 14 This is a structural schematic diagram of a current flexible lightweight photovoltaic panel.

[0050] Figure 15 This is a schematic diagram of a sloping arc-shaped vacuum soil pier and its flexible lightweight photovoltaic panel, as described in this invention.

[0051] Figure 16 This is a schematic diagram of an agricultural greenhouse constructed from the walls formed by vacuum soil mounds and the photovoltaic roof, as described in this invention.

[0052] Figure 17 for Figure 16 A schematic diagram of an array of agricultural greenhouses set up in the desert.

[0053] Figure 18 for Figure 16 A schematic diagram of a longitudinal section of an agricultural greenhouse.

[0054] Figure 19 for Figure 3 A schematic diagram of the cross-sectional structure at the opening of the middle bag.

[0055] Explanation of the reference numerals: 1-Photovoltaic panel, 1a-Flexible photovoltaic panel, 2-Vacuum soil mound, 2a-E-shaped, 2b-Greenhouse wall, 3-Bag, 3a-Bucket, 4-Exhaust port, 5-Cable strap, 6-Sand, 7-Air valve, 8-Photovoltaic array, 8a-Greenhouse roof, 9-(Current) Photovoltaic support, 10-Mat, 11-Template, 12-Vegetables, 13-Sealing cap, 14-Bag opening, 15-Agricultural greenhouse, 16-Protective film. Detailed Implementation

[0056] To more clearly illustrate the technical solutions in the embodiments of the present invention, further description will be provided below in conjunction with the embodiments and accompanying drawings. The accompanying drawings are merely some embodiments of the present invention; those skilled in the art can obtain other drawings based on these drawings without creative effort. The present invention will be further described in detail below with reference to specific embodiments to enable those skilled in the art to understand it.

[0057] Example 1.

[0058] Vacuum-supported photovoltaic (PV) trellis systems for integrated agricultural and solar power in farmland / open fields. For example... Figure 1 and Figure 2As shown in the figure, this embodiment provides a vacuum pier ecological photovoltaic system, which is suitable for field or desert areas, and the specific structure is as follows.

[0059] It includes a photovoltaic support frame and a photovoltaic panel 1 mounted on the photovoltaic support frame. The photovoltaic support frame includes an airtight bag body 3 (e.g., PE+AL+woven fabric+PET composite material). The bag body 3 is puncture-resistant, waterproof, sun-resistant, durable (preferably made of durable materials with the same lifespan as the photovoltaic panel 1, such as impermeable geotextile or dam fabric, which can be used for more than 25 years), has good sealing performance, and can withstand the high and low temperature environment of desert areas. The preset shape and size of the bag body 3 are set according to the size of the photovoltaic panel 1. For example, the preset shape is 2m long, 1m wide, and 1.5m high, close to the local optimal tilt angle. The bag body 3 is provided with an exhaust port 4, and the exhaust port 4 is also equipped with an air valve 7 (e.g., a valve nozzle) that can be connected to a small portable vacuum machine.

[0060] During production, the bag body 3 is taken to a designated location in the field or at the construction site of a desert photovoltaic power station and placed into a template 11 of a predetermined shape. Desert sand (i.e., sand 6) is taken locally and filled into the bag body 3 through the bag opening 14. This can be done manually or automatically using existing equipment such as rice and flour canning machines or concrete pumps. During the filling process, the vent 4 is opened to expel air from the bag, ensuring that the sand 6 is filled tightly (preferably using a vibrator to compact it). After filling, the bag opening 14 is heat-sealed with an electric heat sealer. Ideally, during bag making, a sealant (such as a sealant) should be placed inside the bag opening 14. Figure 19 The protective film 16 (as shown) is used to prevent dust contamination. Before the electric heat sealer heat-seals the bag opening 14, the protective film 16 is torn off to expose the clean inside of the bag opening 14 before heat-sealing. Then, a vacuum machine is connected through the exhaust port 4 to evacuate the bag to a predetermined vacuum level (preferably -0.08MPa to -0.10MPa) to form a vacuum mound 2 with a relative density of 90%, a dry density of 1.85g / cm³, and an unconfined compressive strength of 250kPa. After vacuuming, the air valve 7 is closed to achieve a seal. At this time, the bag body 3 is tightly pressed against the sand 6 inside the bag under the action of vacuum negative pressure (i.e., atmospheric pressure). The sand 6 will solidify into a vacuum mound 2 with a predetermined shape and weight (e.g., about 2250kg) under the action of negative pressure. Then, the template 11 is removed, and the vacuum mound 2 can be left in place for use as a photovoltaic support. It is best to use vacuum negative pressure to compress the vacuum soil mound 2 into a rigid whole with a relative density ≥70%, dry density ≥1.61g / cm³, and unconfined compressive strength ≥200kPa.

[0061] The photovoltaic panel 1 is placed on top of the vacuum soil mound 2 at the optimal tilt angle. Then, the photovoltaic panel 1 is secured to the vacuum soil mound 2 using steel wire ropes, rust-proof chains, rust-proof wires, and other cable ties 5. Preferably, the method is as follows: Figure 8As shown, a protective pad 10 (including various pads, bricks, stones, and other objects that protect the bag body 3, which have a large contact area with the bag body 3) is placed between the cable strap 5 and the vacuum soil mound 2 to prevent the bag body 3 from being abraded, ensure that the photovoltaic panel 1 is firmly fixed, and avoid the photovoltaic panel 1 from shifting due to desert winds and sand. In specific construction, multiple small vacuum soil mounds 2 can be combined and used with reasonable spacing, or a large vacuum soil mound 2 can be used alone.

[0062] During later maintenance, the vacuum level of vacuum mound 2 should be checked regularly. For example, press vacuum mound 2 with your finger. If you feel that vacuum mound 2 has softened and the vacuum level inside the bag has dropped (for example, below -0.06MPa), you can connect a vacuum machine through the exhaust port 4 such as air valve 7 to supplement the air extraction, so as to maintain the vacuum level and ensure the structural stability of vacuum mound 2.

[0063] In this embodiment, the applicant purchased a roll of "PE+AL+woven fabric+PET" composite material, 2.6m wide and 200m long, online for 1250 yuan (equivalent to 2.4 yuan / m²), and used it to manufacture the following... Figure 1 The bag shown is 2m long, 1m wide, and 1.5m high. Each bag 3 uses an average of 13m² of material, totaling 30 RMB. The cost of the finished bag 3 is 35 RMB (including processing fees). The current cost of the photovoltaic support bracket 9 is calculated at 0.25 RMB / watt. The procurement cost of the current photovoltaic support bracket 9 for each 730-watt conventional photovoltaic panel 1 is 730 × 0.25 = 182.5 RMB. The required sand 6 can be desert sand available on-site, eliminating the need for off-site transportation and thus avoiding freight costs.

[0064] Preferably, the width and height of the vacuum soil mound 2 are similar, for example, both set to 1.5 meters. This way, it can resist overturning, sliding, and even a category 12 typhoon solely by its own weight. It can be placed flat on the ground without digging a pit, burying a foundation, or pre-burying a base. If the shape is changed to a slightly trapezoidal shape, wider at the bottom and narrower at the top, with a bottom of 1.5m and a top of 1.2–1.3m, the wind resistance is even better. If the shape is changed to a T-shape, or a U-shape, or a C-shape, or an E-shape 2a (such as...), the wind resistance is even better. Figure 13 As shown in the figure), or an arch shape, it is more stable and saves more sand.

[0065] In summary, using vacuum soil mounds 2 as photovoltaic supports reduces costs by 20% compared to traditional metal supports, a reduction of over (182.5-35) / 182.5×100%=80.8%. Furthermore, the construction is simple, requires no specialized equipment, is environmentally friendly, and does not damage desert vegetation.

[0066] Example 2.

[0067] Vacuum-supported photovoltaic (PV) system for orchards / economic forests, combining agriculture and PV. (Example:) Figure 5As shown, the difference between this embodiment and Embodiment 1 is that the sand 6 is a mixture of soil, sand, and gravel (by weight, not limited) taken locally from the field, and the bag body 3 is made of aluminum foil-polyethylene composite material, which is lower in cost and suitable for the soil environment of the field. The vacuum soil mound 2 is cylindrical in shape (e.g., 1.5 meters in diameter and 0.8 meters in height), weighs approximately 1980 kg, and is suitable for the installation requirements of small distributed photovoltaic panels.

[0068] The manufacturing process is basically the same as in Example 1 above. When filling the sand 6, the soil, sand and gravel are mixed evenly and then put into the bag. The air is discharged by opening the exhaust port 4. After vacuuming to the predetermined vacuum degree, the bag is sealed to form a vacuum mound 2. The photovoltaic panel 1 is tied and fixed by the cable straps 5 to complete the installation.

[0069] This embodiment also achieves the use of local materials, saving transportation and manufacturing costs, without damaging field vegetation, and can be combined with agricultural planting to achieve agricultural-solar complementarity and improve land utilization.

[0070] Example 3.

[0071] Referring to Embodiment 1 above, five photovoltaic panels 1 are bundled together on the same relatively long vacuum soil mound 2, arranged in a configuration as shown in the image. Figure 7 Photovoltaic array 8 is shown.

[0072] It is preferable to arrange multiple shorter and smaller vacuum mounds 2 into a longer and larger group of vacuum mounds 2. In this way, even if one of the shorter and smaller vacuum mounds 2 in the group occasionally breaks, the other shorter and smaller vacuum mounds 2 will still function, without causing the entire photovoltaic array 8 on it to collapse.

[0073] It is advisable to place desiccant and insecticide inside the bag or vacuum mound 2 to prevent moisture evaporation from reducing the vacuum level and to prevent insects such as ants from biting through the bag 3.

[0074] It is preferable to bury the lower end of the vacuum soil mound 2 50-1500mm below the ground surface as a pre-embedded foundation to solidify the foundation.

[0075] Example 4.

[0076] like Figure 11 As shown, agricultural machinery is used to sift out the gravel from the field and fill it into bags 3 to create vacuum mounds 2 as described in Example 3. These mounds support the photovoltaic array 8, which is then placed on the ridges at the edge of the farmland. In this way, the gravel can be stored without incurring transportation costs, and it can be transformed from waste into valuable material by creating vacuum mounds 2 to replace the existing photovoltaic support structure 9, thereby achieving agricultural-photovoltaic complementarity.

[0077] Example 5.

[0078] like Figure 12 As shown, the vacuum soil mound 2 below the photovoltaic array 8 is a windbreak wall type (different from the permeable structure of the traditional photovoltaic support 9) sand-blocking structure. For example, using... Figure 4 The rectangular vacuum soil mounds 2 shown are stacked to form a sand-blocking structure and placed below the photovoltaic array 8. Multiple photovoltaic arrays 8 (arranged in a scientifically reasonable wind-blocking layout) form a photovoltaic wind-blocking matrix; the vacuum soil mounds 2 have the dual functions of photovoltaic support foundation and windbreak and sand-blocking (achieving integrated structural support and windbreak and sand fixation), which can block the movement of wind and sand and reduce surface wind speed, and are used in desert photovoltaic sand control scenarios.

[0079] Example 6.

[0080] like Figure 15 As shown, the vacuum mound 2 below the photovoltaic array 8 has a sloping arc-shaped top structure. It is covered with... Figure 14 The flexible photovoltaic panel 1a shown is an example. The advantage of this application is that the only raw materials required to form the photovoltaic support are the lightweight bag 3 and the lightweight flexible photovoltaic panel 1a, which greatly reduces the amount of transportation and freight costs.

[0081] Example 7.

[0082] like Figure 16 , Figure 17 , Figure 18 As shown, the vacuum soil mounds 2 constitute the walls 2b of a greenhouse (for agriculture such as greenhouses / vegetables / edible fungi), and the photovoltaic array 8 constitutes the roof 8a of the greenhouse. This allows the vacuum soil mounds 2 to function as both greenhouse walls and photovoltaic supports, and the photovoltaic array 8 to function as both the roof 8a and photovoltaic power generation. It is important to emphasize that the greenhouses, vegetable gardens, and edible fungi greenhouses 15 constructed using the vacuum soil mounds 2 and the photovoltaic array 8 (e.g., made with photovoltaic panels 1 with a light transmittance of 20-40%) achieve three benefits at extremely low cost. A single photovoltaic project investment provides a continuous supply of clean energy such as photovoltaic power, free access to agricultural greenhouses 15, and also contributes to desertification control; therefore, the overall cost is extremely low.

[0083] Example 8.

[0084] A method for manufacturing a vacuum support frame includes the following process steps: S1. Using excavators or other machines or manual labor, dig a pit or level the ground at a designated location on the ground to serve as the foundation for the vacuum soil mound 2. S2. Place a template 11 of a predetermined shape in the pit or on the ground; S3. The flexible bag 3 is manually placed into the template 11; S4. Use a blower or air blower to fill the flexible bag 3 with air, so that the flexible bag 3 inflates and fits tightly against the inner wall of the template 11, so as to prevent wrinkles from forming in the vacuum mound 2. S5. Manually or automatically by machine, sand 6 filler is injected into the bulging flexible bag 3 from the bag opening 14, while simultaneously (slowly) expelling excess air from the bag (to avoid the flexible bag 11 collapsing due to excessive air expulsion) until the sand 6 filler is filled to the predetermined position. S6. Seal the bag opening 14 of the flexible bag body 3 with heating equipment such as a hot welding machine or adhesive coating equipment; S7. Use a vacuum machine or other machine to extract the air from the bag through the exhaust port 4 of the flexible bag 3 until the vacuum degree inside the bag reaches -0.06MPa or higher, so that the flexible bag 3 and the sand 6 filler are squeezed under the vacuum negative pressure to form a vacuum mound 2. S8, Close the exhaust port 4; S9. Manually dismantle the template 11 and leave the vacuum soil mound 2 in place to be used as a column, foundation or overall support structure of the photovoltaic bracket 9.

[0085] Furthermore, the vacuum support frame preparation method includes any one of the following steps ① to ⑥: ① Connect the exhaust port 4 to the air valve 7, and close / open the exhaust port 4 by closing the air valve 7; ②The sand and soil 6 filler material is taken locally, first put into bags, and then compacted with a vibrator; ③ Place the vacuum soil mound 2 in farmland, orchard, desert, abandoned land or field edges; ④ Bury the lower end of the vacuum soil mound 2 into a pit 50mm to 1500mm below the ground surface; ⑤ Place a desiccant and / or insecticide into the vacuum soil mound 2; ⑥ The vacuum soil mound 2 is used to construct the wall of the agricultural greenhouse 15 so that the vacuum soil mound 2 has the dual functions of the wall of the agricultural greenhouse 15 and the photovoltaic support 9.

[0086] It should be noted that the bag body 3 mentioned in this invention generally refers to a flexible container, and can also be a semi-flexible container that can be compressed and deformed (such as...). Figure 9The bucket 3a and its sealing cap 13 shown can also be a retractable container, not limited to being made of PE+AL+woven fabric+PET composite material, dam fabric, or Al / PE material. Other airtight, puncture-resistant, and durable flexible materials (preferably inorganic or metallic materials) suitable for long-term outdoor use in wind and sun are also acceptable. These airtight bag materials are common commercially available vacuum packaging materials and are easy to purchase, so they will not be described in detail here. The vacuum level can be flexibly adjusted according to the type of sand 6 and the size of the photovoltaic panel 1, as long as the sand 6 can be solidified into a stable support structure. The mixing ratio of sand 6 can be flexibly adjusted according to local resource conditions and does not need to be strictly limited. The cable straps 5 can be replaced with other flexible binding parts, as long as they can achieve a secure installation of the photovoltaic panel 1.

[0087] Furthermore, the vacuum pier ecological photovoltaic system of the present invention is not only suitable for deserts, loess lands, and fields, but also for Gobi deserts, tidal flats, islands, and other similar locations.

Claims

1. A vacuum pier ecological photovoltaic system, comprising a photovoltaic support frame and photovoltaic panels mounted on the photovoltaic support frame, characterized in that: The photovoltaic support structure includes an airtight flexible bag filled with one or more sand, soil, or gravel fillers. The bag is then evacuated and sealed, maintaining a negative pressure of -0.10 MPa to -0.06 MPa. Under the vacuum pressure, the bag and the sand filler are compressed into a vacuum mound. The vacuum mound serves as the column, foundation, or overall support structure of the photovoltaic support structure.

2. The vacuum pier ecological photovoltaic system according to claim 1, characterized in that, It also includes any one of the following features ① to ⑩: ① The bag body is provided with an exhaust port for filling and venting or for re-vacuuming after the vacuum level drops; ②The sand and soil filler is one or more sand and soil mixtures selected locally from sand, gravel, and soil, which are packed into bags and then compacted by vibration; ③ The photovoltaic panel is tied to the vacuum soil mound by cable straps or tensioned by tie rods; a protective pad is placed between the cable straps and the bag body and / or between the photovoltaic panel and the bag body to prevent the bag body from being worn out; ④ The photovoltaic panel is fixed to the crossbeam, and the crossbeam is tied to the vacuum soil mound by cables or tensioned by rods; ⑤ The vacuum soil mounds are placed in farmland, orchards, deserts, abandoned land or field edges without occupying the high-quality arable layer; ⑥ The lower end of the vacuum soil pier is buried 50mm to 1500mm below the ground surface to enhance its anti-sliding and anti-overturning stability; ⑦ A photovoltaic array is supported and fixed by multiple vacuum soil blocks, with the multiple vacuum soil blocks serving as backups for each other; ⑧ A desiccant and / or insecticide are placed inside the bag or vacuum mound; ⑨ Multiple photovoltaic panels form a photovoltaic array, and the vacuum soil mound below the photovoltaic array is a windbreak and sand-blocking structure; multiple photovoltaic arrays form a photovoltaic windbreak matrix; the vacuum soil mound has the dual functions of photovoltaic support and windbreak and sand-blocking, which can block the movement of wind and sand and reduce the surface wind speed, and is used in desert photovoltaic sand control scenarios. ⑩ The vacuum soil mounds constitute the walls of the agricultural greenhouse, and the photovoltaic array constitutes the roof of the greenhouse; the vacuum soil mounds serve the dual functions of greenhouse walls and photovoltaic supports, and the photovoltaic array serves the dual functions of greenhouse roof and photovoltaic power generation.

3. A method for preparing a vacuum support frame, characterized in that, The process includes the following steps: S1. Excavate a pit or level the ground at a designated location on the ground; S2. Place a template of a predetermined shape in the pit or on the ground; S3. Place the flexible bag into the template; S4. Inflate the flexible bag with air to make it bulge and fit tightly against the inner wall of the template; S5. Inject sand filler into the bulging flexible bag from the bag opening, and simultaneously expel excess air from the bag until the sand filler fills the predetermined position. S6. Seal the opening of the flexible bag; S7. Air is extracted from the bag through the exhaust port of the flexible bag, so that the flexible bag and the sand filler are squeezed together under vacuum negative pressure to form a vacuum mound. S8. Close the exhaust port; S9. Remove the template and leave the vacuum soil mound in place to be used as a column, foundation or overall support structure for photovoltaic brackets.

4. The method for preparing a vacuum support frame according to claim 3, characterized in that, It also includes any one of the following features ① to ⑥: ① Connect the exhaust port to the air valve, and close the exhaust port by closing the air valve; ②The sand and soil filler material is sourced locally, first placed into bags, and then compacted by vibration; ③ Place the vacuum soil mound in farmland, orchard, desert, abandoned land or field edges; ④ Bury the lower end of the vacuum soil mound into a pit 50mm to 1500mm below the ground surface; ⑤ Place a desiccant and / or insecticide into the vacuum soil mound; ⑥ Use the vacuum soil mounds to construct greenhouse walls, so that the vacuum soil mounds have the dual functions of greenhouse walls and photovoltaic supports.

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