A three-layer air-sealed stable heat preservation structure for dragon fruit greenhouses

Abstract

This utility model relates to the field of greenhouse technology, specifically a three-layer air-conditioning and stable insulation structure for dragon fruit greenhouses, designed to address the problem of reduced dragon fruit yields caused by temperature fluctuations in extreme climates. The structure comprises an arc-shaped frame consisting of a support frame, a middle support layer, and a top support layer, sequentially covered with a PE bottom layer, an EVA middle layer, and a PEP top layer. A 20-30 cm gap between the bottom and middle layers forms a first air gap, and a 20-30 cm gap between the middle and top layers forms a second air gap, creating a low-thermal-conductivity buffer zone. Fixing holes with metal rings are provided on both sides of the coverings, and the top layer includes drainage pipes and seepage holes. Through the synergistic effect of the three layers of covering materials and the air gaps, this structure ensures that the temperature inside the greenhouse is 8-10°C higher than the outside temperature in winter and 3-5°C lower in summer, reducing frost damage by over 90% and achieving stable temperature control.

Description

Technical Field

[0001] This utility model relates to the field of greenhouse technology, and in particular to a three-layer air-sealed stable dragon fruit greenhouse insulation structure. Background Technology

[0002] Dragon fruit, a unique fruit originating from tropical regions, is beloved for its vibrant red skin, sweet and juicy flesh, and numerous small black seeds. It is not only rich in vitamins and dietary fiber, but its unique shape and delicious taste also make it a top choice for healthy eating. Dragon fruit greenhouses, on the other hand, are a testament to modern agricultural technology, creating optimal growing conditions for dragon fruit, allowing it to thrive even in non-native regions and bear fruit year-round.

[0003] Currently, existing dragon fruit greenhouse insulation structures typically employ only single- or double-layer film coverings. While these provide basic insulation, they cannot control temperature through layered gradient regulation (e.g., limited temperature increase during winter nights and limited temperature decrease during summer). Furthermore, the lack of air gaps between layers leads to high heat transfer efficiency. In addition, the film coverings have limited functionality (e.g., light transmission and heat insulation cannot be achieved simultaneously), making them susceptible to frost or heat damage in extreme climates. Ultimately, this results in large fluctuations in dragon fruit yield and inconsistent fruit quality. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as the inability to control temperature through layered gradient regulation, which leads to large fluctuations in dragon fruit yield and inconsistent fruit quality under extreme climates. Therefore, this invention proposes a three-layer air-sealed stable dragon fruit greenhouse insulation structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A three-layer, airtight, stable insulation structure for dragon fruit greenhouses includes:

[0007] A support frame, wherein a middle layer support is fixedly installed on the top of the support frame, a top layer support is fixedly installed on the top of the middle layer support, the top of the support frame is covered with a bottom layer film, the top of the middle layer support is covered with a middle layer film, and the top of the top layer support is covered with a top layer film.

[0008] The bottom layer and the middle layer of the film form a first air gap, and the middle layer and the top layer of the film form a second air gap. The distance between the first air gap and the second air gap is 20-30 cm, which constitutes a low thermal conductivity buffer zone. This makes the temperature inside the greenhouse 8-10℃ higher than the outside temperature in winter and 3-5℃ lower than the outside temperature in summer, thus achieving temperature gradient regulation for increasing temperature in winter and decreasing temperature in summer.

[0009] As a further improvement to the above technical solution:

[0010] The bottom layer film, the middle layer film, and the top layer film all have multiple evenly distributed fixing holes at their two ends, and a metal ring is fixedly installed in the inner circle of each fixing hole.

[0011] Both ends of the top layer membrane are fixedly connected to multiple evenly distributed water pipes inside the fixing holes, and multiple evenly distributed seepage holes are opened on the outside of the multiple water pipes.

[0012] The bottom layer coating is made of PE material.

[0013] The middle layer coating is made of EVA material.

[0014] The top layer coating is made of PEP material.

[0015] The support frame, middle support, and top support are all arc-shaped frames welded from galvanized steel pipes, with a spacing of 3-5 meters.

[0016] The bottom of the water pipe is cone-shaped, which makes it easy to insert it obliquely into the soil to a depth of 20-30 cm.

[0017] The distance between the first air gap and the second air gap is 25 cm, which optimizes the thermal buffering efficiency.

[0018] In this application, when starting use, remove debris from the ground outside the planting area and then install galvanized steel pipes or other metal support frames at intervals (usually 3-5 meters). The bottom of the support frame is inserted 60-90 cm into the ground, and the surrounding soil is compacted to enhance stability. Weld or bolt the middle layer support to the top of the support frame, with the height 20-30 cm above the top of the support frame. Then, install the top layer support on top of the middle layer support by installing the middle layer support, with the height 20-30 cm above the top of the middle layer support, forming a three-layer three-dimensional structure.

[0019] Next, unfold the PE bottom layer film (high light transmittance) and cover the top of the support frame. The edges of the bottom layer film should extend 30-50 cm beyond the bottom of the support frame. Fixing holes are made in the extended part, and metal rings are embedded in the fixing holes to prevent tearing during installation. Then, use U-shaped nails or ground anchors to pass through the fixing holes and press the bottom layer film firmly to the ground. After installation, fill the pressed part of the bottom layer film with soil to ensure that the bottom layer film is tightly sealed and windproof. Then unfold the EVA middle layer film (heat insulation and anti-fog) and lay it to cover the top of the middle layer support. Following the above operation, fix the extended parts of the edges on both sides with U-shaped nails or ground anchors and fill them with soil to prevent heat loss. Finally, unfold the PEP top layer film (aging resistant and UV resistant) and lay it to cover the top of the top layer support. First, insert the water pipes extending from the extended parts on both sides into the soil at an angle for 20-30 cm. After the water pipes are fully inserted, fix the edges of the top layer film with U-shaped nails or ground anchors through the fixing holes.

[0020] The three-layer air gap (20-30 cm between the bottom and middle layers, and 20-30 cm between the middle and top layers) forms a low thermal conductivity buffer zone. Combined with the heat preservation performance of the EVA film, the temperature inside the greenhouse at night is 8-10℃ higher than the outside temperature, reducing the frost damage rate by more than 90%. The arc-shaped top layer film guides the hot air to rise and forms convection through the openable greenhouse door, keeping the temperature inside the greenhouse 3-5℃ lower than the outside temperature, thus preventing the dragon fruit flower buds from being scorched.

[0021] When it rains, rainwater will first fall on the top surface of the top cladding, because the top cladding is curved (e.g., Figure 1 As shown in the diagram, rainwater flows to both sides. During the flow, the rainwater flows into the drainage pipe. After entering the drainage pipe, the rainwater flows downward along the drainage pipe. Because the outside of the drainage pipe has multiple evenly distributed seepage holes in a longitudinal ring shape, the rainwater will slowly seep into the soil through these seepage holes to provide water for crops.

[0022] This utility model has the following beneficial effects:

[0023] This invention utilizes a three-layer film covering to form a three-layer gradient insulation structure. The bottom layer has high light transmittance, the middle layer has strong heat insulation, and the top layer has aging resistance and arc-shaped air guiding characteristics. Combined with the air gap between the layers to form a low thermal conductivity buffer zone, the temperature inside the greenhouse increases in winter and decreases in summer, significantly improving the disaster resistance, yield and quality of dragon fruit. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a three-layer air-sealed stable dragon fruit greenhouse insulation structure proposed in this utility model.

[0025] Figure 2This is a schematic diagram of the overall structure of the support frame for a three-layer air-tight stable dragon fruit greenhouse heat preservation structure proposed in this utility model;

[0026] Figure 3 This is a schematic diagram of the film-covered structure of a three-layer air-sealed stable dragon fruit greenhouse insulation structure proposed in this utility model;

[0027] Figure 4 This is a top-view schematic diagram of the top layer of the three-layer air-sealed stable dragon fruit greenhouse insulation structure proposed in this utility model.

[0028] In the diagram: 1. Support frame; 2. Middle layer support; 3. Top layer support; 4. Bottom layer membrane; 5. Middle layer membrane; 6. Top layer membrane; 7. Fixing hole; 8. Water pipe; 9. Seepage hole. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] In one embodiment

[0031] Reference Figure 1-4 A type of greenhouse, comprising:

[0032] Support frame 1 is made of galvanized steel pipes welded into an arc-shaped frame, vertically fixed to the ground at intervals of 3-5 meters to ensure structural stability. The top of the support frame is fixed to the middle support 2 by bolts or welding. The middle support 2 is also made of galvanized steel pipes, forming an intermediate support layer. The top of the middle support 2 is then fixed to the top support 3 by welding or bolts. The top support 3 is also made of galvanized steel pipes and is an arc-shaped frame, forming a top airflow guide surface. Support frame 1, middle support 2 and top support 3 form a three-dimensional frame, with each layer spaced 20-30 cm apart. This creates a 20-30 cm air gap between the bottom film 4, middle film 5 and top film 6 after laying, forming a low thermal conductivity buffer zone. This allows for increased temperature in winter and decreased temperature in summer inside the greenhouse, significantly improving the dragon fruit's disaster resistance, yield and quality.

[0033] Fixing holes 7 are opened at regular intervals on both sides of the bottom layer membrane 4, the middle layer membrane 5, and the top layer membrane 6. Stainless steel metal rings are embedded in the fixing holes 7. During installation, U-shaped nails are passed through the metal rings to press the membrane tightly to the ground and cover it with soil. The embedding of the metal rings increases the tear resistance of the membrane, so that it will not tear or fall off in windy weather. The dual fixing method of U-shaped nails and soil filling improves the sealing of the membrane edge and reduces heat loss from the edge.

[0034] The two ends of the top layer covering film 6 are located inside the fixing holes 7, and water guide pipes 8 are fixedly connected at certain intervals. The water guide pipes 8 can be in the form of cylindrical hollow pipes, square columnar through-groove pipes, or tapered pipes with gradually narrowing bottoms. The water guide pipes 8 have longitudinally annular seepage holes 9 on the outside. The bottom of the water guide pipes 8 is pointed and conical, which makes it easy for the water guide pipes 8 to be inserted into the soil. During installation, the water guide pipes 8 are inserted obliquely into the soil layer by 25 cm. When it rains, the arc-shaped top layer covering film 6 guides the rainwater to both sides, flows into the water guide pipes 8, and flows down along the water guide pipes 8. Then, it slowly seeps into the soil through multiple seepage holes 9 to provide water for the dragon fruit.

[0035] This application can be used in the field of three-layer air-sealed stable dragon fruit greenhouse insulation structure technology, and can also be used in other fields applicable to this application.

[0036] In another embodiment

[0037] Reference Figure 3 A three-layer air-sealed stable dragon fruit greenhouse insulation structure is proposed. It is applied to the technical field of three-layer air-sealed stable dragon fruit greenhouse insulation structure. The bottom layer is covered with a PE film with high light transmittance. Its surface is treated with anti-drip treatment so that condensation forms a uniform water film instead of water droplets, avoiding dripping and causing the dragon fruit stem base to rot. During the day in winter, the PEP film can increase the light intensity inside the greenhouse to promote photosynthesis. At night, its low thermal conductivity reduces heat loss.

[0038] The middle layer of the film is 5mm thick EVA film, containing vinyl acetate copolymer and closed-cell bubbles. The inner layer is added with silicone anti-fogging agent, and the film has a continuous effective period of 3 years. At night, the EVA film blocks the transfer of heat from the greenhouse to the middle air layer, reducing the incidence of erythroplasmosis.

[0039] The top layer of film 6 is a PEP film co-extruded from polyethylene and polypropylene. It has a high UV resistance coefficient and long service life. After covering, the surface forms an arc-shaped slope, which allows hot air to rise along the slope in summer and form natural convection through the openable greenhouse door, making the temperature inside the greenhouse lower than the outside temperature. The tensile strength of the PEP film can withstand the pressure of snow accumulation.

[0040] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A three-layer space-stable steady pitaya greenhouse heat preservation structure, characterized in that, include: A support frame (1) is provided with a middle layer support (2) fixedly installed on the top of the support frame (1), a top layer support (3) fixedly installed on the top of the middle layer support (2), a bottom layer film (4) covering the top of the support frame (1), a middle layer film (5) covering the top of the middle layer support (2), and a top layer film (6) covering the top of the top layer support (3). The bottom layer film (4) and the middle layer film (5) form a first air gap, and the middle layer film (5) and the top layer film (6) form a second air gap. The distance between the first air gap and the second air gap is 20-30 cm, which constitutes a low thermal conductivity buffer zone, so that the temperature inside the greenhouse is 8-10℃ higher than the outside temperature in winter and 3-5℃ lower than the outside temperature in summer, thus achieving temperature gradient regulation of increasing temperature in winter and decreasing temperature in summer.

2. The three-layer space-stable fire pit pit greenhouse heat preservation structure according to claim 1, characterized in that, The bottom layer film (4), the middle layer film (5) and the top layer film (6) are provided with a plurality of evenly distributed fixing holes (7) at their respective ends, and a metal ring is fixedly provided in the inner circle of each of the plurality of fixing holes (7).

3. The three-layer space-stable steady pitaya greenhouse heat preservation structure according to claim 1, characterized in that, The two ends of the top layer membrane (6) are fixedly connected to a plurality of uniformly distributed water pipes (8) inside the fixing hole (7), and a plurality of uniformly distributed seepage holes (9) are opened on the outside of the plurality of water pipes (8).

4. The three-layer space-stable steady pitaya greenhouse heat preservation structure according to claim 1, characterized in that, The bottom film (4) is a PE material film.

5. The three-layer space-stable steady pitaya greenhouse heat preservation structure according to claim 1, characterized in that, The middle layer coating (5) is an EVA material coating.

6. The three-layer space-stable steady pitaya greenhouse heat preservation structure according to claim 1, characterized in that, The top coating (6) is a PEP material coating.

7. The three-layer space-stable steady pitaya greenhouse heat preservation structure according to any one of claims 1-3, characterized in that, The support frame (1), the middle support (2) and the top support (3) are all arc-shaped frames welded from galvanized steel pipes, with a spacing of 3-5 meters.

8. The three-layer space-stable steady pitaya greenhouse heat preservation structure according to claim 3, characterized in that, The bottom of the water pipe (8) is cone-shaped, which makes it easy to insert obliquely into the soil layer to a depth of 20-30 cm.

9. The three-layer space-stable steady pitaya greenhouse heat preservation structure according to claim 1, characterized in that, The distance between the first air gap and the second air gap is 25 cm, which optimizes the thermal buffering efficiency.

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