Active heat storage greenhouse curtain wall and greenhouse back wall and wall materials

Abstract

The present invention belongs to the field of greenhouse heating technology, specifically a greenhouse enclosure curtain wall with active heat storage and its greenhouse back wall and wall material. The curtain wall system of the present invention is composed of an XPS-PVC greenhouse back wall, a black film, an upper water pipe, a return pipe, and a water tank equipped with a water pump. Water is injected from the upper water pipe and flows between the wall and the black film, and is guided back to the water tank equipped with a water pump by the return pipe. The XPS-PVC composite wall material of the present invention uses PVC as a finishing layer, and flame-retardant XPS is sandwiched in the middle as an insulation layer. The XPS-PVC greenhouse back wall of the present invention is borne by a greenhouse steel frame to bear the greenhouse load, and multiple pieces of XPS-PVC composite wall materials are spliced ​​into wall panels and fixed on the steel frame of the north wall of the greenhouse. The curtain wall system of the present invention can complete the process of active heat storage and release by directly using the wall, without the need to set up a separate heat collection system, occupying less space, low cost, and easy to promote.

Description

Technical Field

[0001] The invention belongs to the technical field of greenhouse heating, and in particular relates to an active heat-storing greenhouse enclosure curtain wall and a greenhouse rear wall and wall material thereof. Background Art

[0002] The load of the streamlined solar greenhouse is entirely borne by the greenhouse steel frame, so the back wall, back slope, and gable wall only bear the functions of greenhouse enclosure, heat preservation, waterproofing and flame retardancy. The walls of solar greenhouses on the market are mainly divided into:

[0003] 1Hard wall:

[0004] 1.1 Cement composite insulation board: It is composed of two layers of fiber cement board with EPS foam board in the middle. Its disadvantage is that it is not waterproof.

[0005] 1.2 Color steel sandwich panel: It is composed of two layers of color steel plates with EPS foam board or polyurethane foam board with better thermal insulation. Its disadvantage is that it is easy to condense, and water leakage will cause the steel plate to rust.

[0006] 2Soft wall (also called flexible wall):

[0007] 2.1 Composite flexible insulation material: It is composed of two layers of PVC waterproof cloth and thermal insulation cotton. The thermal insulation cotton is easy to absorb water and also has no waterproof function.

[0008] 2.2 Spray-bonded cotton insulation quilt: It is composed of two layers of spray-bonded cotton insulation quilt. The insulation cotton is easy to absorb water and also has no waterproof function.

[0009] It can be seen that waterproofing is a major problem in streamlining the walls of solar greenhouses.

[0010] The active heat storage and release system uses solar energy as a heat source and water as a heat storage medium. During the day, water is circulated through the heat collecting device to absorb solar energy and store energy in the water tank. At night, water is circulated through the heat releasing device to release heat to increase the temperature in the solar greenhouse. Currently, the team of Professor Cheng Ruifeng from the Institute of Environmental Development of the Chinese Academy of Agricultural Sciences is conducting related research.

[0011] Fang Hui et al. (2011) designed and tested the first generation of active heat storage and release system products. Heat is collected by the collector, transferred to the underground heat exchanger through water circulation, and then transferred to the shallow soil and stored through heat transfer between the water pipe and the soil. The heat collection efficiency of the first generation of active heat storage and release system is 31.1%, which is low. Zhang Yi et al. (2012) designed and tested the second generation of active heat storage and release system products. On the basis of the first generation of active heat storage and release system, the heat collection and release device and the heat storage device were improved. The PE pipe was changed to a water curtain, and the heat storage device was changed from a heat exchange pipe buried in the shallow surface to a water storage tank. The heat collection efficiency was greatly improved. Li Wen et al. (2013) designed and tested the third generation of active heat storage and release system. The third generation of active heat storage and release system changed the heat absorption layer to a double-layer black PE film. The heat collection efficiency of the collector plate was improved. Lu Wei et al. (2017) optimized the design and tested the fourth-generation active heat storage and release system, changing the PE black film to PVC black film, and the open return pipe to a welded closed return pipe, etc., which improved the heat collection efficiency. A thermal environment model of the active heat storage and release system of the solar greenhouse was established. The current active heat storage and release system has developed to the sixth generation. The sixth-generation active heat storage and release system (2018) changed the PVC black film of the heat absorption layer to aluminum alloy, added an auxiliary heating device, and added a temperature + time control system. However, due to the high price of aluminum alloy, the cost of the active heat storage and release system is high, which is not conducive to future promotion.

[0012] Active heat storage systems used to be manufactured separately, with water as the heat transfer medium to form the system, regardless of whether the heat transfer plate is made of plastic or metal. Because the walls of solar greenhouses, whether earth walls, brick walls, cement composite wall panels, or flexible fabric wall panels, have the characteristics of absorbing and seeping water, and although color steel sandwich panels do not absorb water, they will corrode and rust if exposed to water for a long time, so the idea of ​​a heat collection curtain wall with water as the heat transfer medium is impossible to realize.

[0013] If the problem of greenhouse wall waterproofing can be solved, the active heat storage and release system can be further improved based on this, and it can be organically combined with the north wall of the greenhouse to greatly reduce costs. Summary of the invention

[0014] In order to improve the nighttime temperature of the solar greenhouse and simplify the greenhouse rear wall structure, the solar heating device, the heat dissipation device, the wall insulation function and the load-bearing function are combined. The purpose of the present invention is to provide an active heat storage greenhouse enclosure curtain wall, which is composed of an XPS-PVC greenhouse rear wall, a black film, an upper water pipe, a return water pipe, and a water tank equipped with a water pump; the black film covers the side of the XPS-PVC greenhouse rear wall in the greenhouse, the edge of the black film and the XPS-PVC greenhouse rear wall is sealed, and the space between the two is hollow; the upper water pipe pumps water from the water tank equipped with a water pump into between the XPS-PVC greenhouse rear wall and the black film, and extends along the upper edge between the XPS-PVC greenhouse rear wall and the black film to the edge of the black film and the XPS-PVC greenhouse rear wall, and the portion of the upper water pipe extending between the black film and the XPS-PVC greenhouse rear wall is distributed with a number of small holes as water injection ports; after the water flows through between the XPS-PVC greenhouse rear wall and the black film, it is guided back to the water tank equipped with a water pump from the return water pipe;

[0015] The XPS-PVC greenhouse rear wall is composed of a greenhouse steel frame and wall panels; the greenhouse steel frame bears the greenhouse load; the wall panels are spliced ​​with multiple XPS-PVC composite wall materials, and the seams are waterproof and sealed; the wall panels are fixed on the greenhouse north wall steel frame to obtain the XPS-PVC greenhouse rear wall;

[0016] The XPS-PVC composite wall material is a composite waterproof semi-rigid wall material composed of polyester fiber reinforced polyvinyl chloride (PVC) waterproof coiled material as a wall material as a finishing layer, and a Class B flame-retardant extruded board (XPS) sandwiched in the middle as a thermal insulation layer.

[0017] Wherein, the thickness of the polyester fiber reinforced polyvinyl chloride (PVC) waterproofing coiled material is 1.2 to 2.0 mm, and the thickness of the extruded polystyrene board (XPS) is 100 to 120 mm.

[0018] Each piece of the XPS-PVC composite wall material is rectangular, 3000 mm in length and 600-1200 mm in width.

[0019] The XPS-PVC composite wall material has tongue and groove along four sides of the extruded board (XPS) so as to splice a plurality of XPS-PVC composite wall materials together.

[0020] The mortise and tenon groove has a width of 5 mm and a depth of 20 to 25 mm. When in use, it is equipped with a mortise and tenon strip with a thickness of 5 mm and a width of 40 to 50 mm.

[0021] When XPS-PVC composite wall materials are made manually, polyester fiber reinforced polyvinyl chloride (PVC) waterproof membrane uses self-adhesive type. When professional manufacturers make it, they use composite board adhesive to bond polyester fiber reinforced polyvinyl chloride (PVC) waterproof membrane to extruded board (XPS).

[0022] The splicing is to spray foam glue on the two contacting edges of two adjacent XPS-PVC composite wall materials, insert tenon strips into the tenon grooves of the two contacting edges, and splice them together.

[0023] Among them, the seam waterproof sealing is selected from one or more of direct soldering sealing, hot melt adhesive filling welding sealing, strip polyester fiber reinforced polyvinyl chloride waterproof membrane covering the seam and then pressing the gap hot air welding sealing, and wide waterproof tape gluing sealing.

[0024] Among them, the fixing can be carried out by using any one or more of cold heading clamp nuts, expansion bolts, long drill tail self-tapping screws, etc., and generally long drill tail self-tapping screws can be used.

[0025] The edges of the black film and the XPS-PVC greenhouse rear wall are sealed. The black film is connected by a pressure strip and self-tapping screws that fix the pressure strip, the black film, and the XPS-PVC greenhouse rear wall in sequence. The length of the pressure strip is the same as the length of the edge of the black film. The edges of the black film are all pressed tightly with the pressure strip to achieve watertightness.

[0026] In order to make the water flow between the rear wall of the XPS-PVC greenhouse and the black film uniform, the several small holes are arranged in the following manner:

[0027] 1) The diameter of the small holes becomes larger along the extension direction of the water supply pipe;

[0028] 2) The density of small holes increases along the extension direction of the water pipe;

[0029] 2) A small hole is provided by combining 1) and 2).

[0030] Wherein, an exhaust hole is provided at the upper end between the rear wall of the XPS-PVC greenhouse and the black film.

[0031] The specific steps of using the greenhouse enclosure curtain wall with active heat storage are as follows:

[0032] 1) During the day, the water pump is operated to form a "water tank-black film on the wall-water tank" loop: the water pump causes water to flow from the water tank through the black film on the wall. After absorbing the heat energy provided by solar radiation and heating up, the water is discharged along the return pipe and flows back to the water tank, realizing a circulation flow and continuously absorbing heat until the water pump is turned off in the evening;

[0033] 2) At night, run the water pump to form a "water tank-black film on the wall-water tank" loop: the water pump makes water flow from the water tank through the black film on the wall, and the temperature drops after releasing the heat energy stored in the water. The water is discharged through the pipe and flows back to the water tank, so that the water circulates between the water tank and the heat storage and release device, continuously releasing heat until the water pump is turned off at dawn.

[0034] Another object of the present invention is to provide an XPS-PVC composite wall material, which is a composite waterproof semi-rigid wall material composed of a polyester fiber reinforced polyvinyl chloride (PVC) waterproof membrane as a wall material as a finishing layer, and a Class B flame-retardant extruded board (XPS) sandwiched in the middle as an insulation layer.

[0035] Wherein, the thickness of the polyester fiber reinforced polyvinyl chloride (PVC) waterproofing coiled material is 1.2 to 2.0 mm, and the thickness of the extruded polystyrene board (XPS) is 100 to 120 mm.

[0036] Each piece of the XPS-PVC composite wall material is rectangular, 3000 mm in length and 600-1200 mm in width.

[0037] The XPS-PVC composite wall material has tongue and groove along four sides of the extruded board (XPS) so as to splice a plurality of XPS-PVC composite wall materials together.

[0038] The mortise and tenon groove has a width of 5 mm and a depth of 20 to 25 mm. When in use, it is equipped with a mortise and tenon strip with a thickness of 5 mm and a width of 40 to 50 mm.

[0039] When XPS-PVC composite wall materials are made manually, polyester fiber reinforced polyvinyl chloride (PVC) waterproof membrane uses self-adhesive type. When professional manufacturers make it, they use composite board adhesive to bond polyester fiber reinforced polyvinyl chloride (PVC) waterproof membrane to extruded board (XPS).

[0040] The present invention also provides an XPS-PVC greenhouse back wall, which is composed of a greenhouse steel frame and wall panels; the greenhouse steel frame bears the greenhouse load; the wall panels are spliced ​​together by multiple pieces of XPS-PVC composite wall materials, and the joints are waterproof and sealed; the wall panels are fixed on the greenhouse north wall steel frame to obtain the XPS-PVC greenhouse back wall.

[0041] The splicing is to spray foam glue on two contacting edges of two adjacent XPS-PVC composite wall materials, insert tenon strips into the tenon grooves of the two contacting edges, and splice them together.

[0042] The sealed seams are sealed by direct welding at the seams, welding and sealing with hot melt adhesive filling, hot air welding and sealing after covering the seams with strip-shaped polyester fiber reinforced polyvinyl chloride (PVC) waterproof membrane and then pressing the gap, or gluing and sealing with wide waterproof tape.

[0043] The fixing can be performed by using any one or more of cold heading clamp nuts, expansion bolts, long drill tail self-tapping screws, etc., and generally long drill tail self-tapping screws can be used.

[0044] The beneficial effects of the present invention are:

[0045] Polyester fiber reinforced polyvinyl chloride (PVC) waterproofing membrane is a thermoplastic PVC membrane. The membrane uses polyester fiber fabric as a reinforcement. Through a special extrusion coating process, the double-sided polyvinyl chloride plastic layer and the middle polyester fabric are combined into a polymer membrane. The advanced formula of the polyvinyl chloride plastic layer combined with the mesh structure of the polyester fiber fabric, the membrane has excellent dimensional stability and a low thermal expansion coefficient, which improves the long-term performance of the membrane directly exposed to the natural environment. Its characteristics are as follows: 1. The polyester fiber reinforced polyvinyl chloride (PVC) waterproofing membrane has high tensile strength and good elongation. Small thermal dimensional changes. 2. It has good weldability and becomes one with the parent body after hot air welding. 3. It is resistant to aging, UV radiation, chemical corrosion, and plant root penetration. 4. It has good flexibility at low temperatures (-20 degrees). 5. Service life: 20 years for roofs and 50 years underground. 6. The color surface reflects ultraviolet rays, and the surface of the waterproof membrane absorbs little heat and has a low temperature. 7. Excellent flexibility, high tensile strength, excellent dimensional stability, high mechanical strength, erosion resistance, root penetration resistance, weather resistance, UV resistance and hail resistance.

[0046] The above characteristics of polyester fiber reinforced polyvinyl chloride (PVC) waterproofing membrane meet the basic requirements of light greenhouse for interior and exterior wall decoration. It has the functions of waterproof, aging resistance, UV resistance, low expansion rate, and accidental impact resistance. The price of the membrane is moderate, with a price of 13 to 20 yuan per square meter.

[0047] Polyvinyl chloride foam plastics are divided into expanded polystyrene board (EPS) and continuously extruded extruded board (XPS). Compared with polystyrene board (EPS), extruded board (XPS) is the third generation of rigid foam insulation material. From the process point of view, it overcomes the pollution problem of EPS production process and has excellent performance that EPS cannot replace. It is a board with continuous uniform surface and closed-cell honeycomb structure made of polyvinyl chloride resin and other additives through extrusion process. These thick plates of honeycomb structure will not have gaps at all. The insulation material of this structure can have different pressure resistance (150~500KPA), and at the same time has the same low value of thermal conductivity (only 0.028W / MK) and long-lasting excellent thermal insulation and compressive resistance. Its compressive strength can reach 220~500KPA. Characteristics of extruded board (XPS): 1. Excellent thermal insulation. It has the characteristics of high thermal resistance, low linearity and low expansion ratio. Practice has proved that the thermal insulation performance of 20MM thick extruded board is equivalent to 50mm thick foamed polyvinyl chloride and 120mm thick cement perlite. 2. Excellent high-strength compressive strength. 3. High-quality water-repellent and moisture-proof. Because it does not absorb water, it solves the problems of water leakage, penetration, frost and condensation of other materials. 4. Light texture and easy to use. 5. Good stability. 6. Environmental performance of the product. It does not emit harmful substances and is harmless to the human body. "The addition of flame retardants makes XPS flame retardant. They are marked as B1 and B2 flame retardant extruded boards (XPS). The density of B1 grade extruded board (XPS) is 32 kg / cubic meter.

[0048] Polyester fiber reinforced polyvinyl chloride (PVC) waterproofing membrane and extruded polystyrene (XPS) meet the comprehensive performance requirements of the light solar greenhouse wall. Moreover, they are different manufacturing forms of the same material, and the basic performance of the two is the same. The XPS-PVC composite wall material obtained by combining the two meets the requirements of solar greenhouse wall materials while solving the waterproofing problem.

[0049] The XPS-PVC greenhouse back wall provided by the present invention is light in weight, overcomes the defect of water absorption of the existing greenhouse wall, and does not cause cracking, debonding, expansion and deformation of the greenhouse wall due to water absorption. No waterproof layer or coating finishing layer is needed. The material has good heat-sealing welding performance, is simple and easy to operate, can be completed using an ordinary hot air welding gun, and has reliable performance after welding. The overall cost is low and it is easy to promote and apply.

[0050] Utilizing the waterproof property of the XPS-PVC greenhouse rear wall, the active heat storage greenhouse enclosure curtain wall provided by the present invention is a curtain wall system that combines the active heat storage and release system with the greenhouse rear wall. The wall can be directly used to collect heat without setting up a separate heat collection system. Through innovative improvements on the greenhouse wall and the structure of the solar heat storage and release device, heat storage, heat release, insulation and load-bearing are integrated into the greenhouse wall. The new structural rear wall has both load-bearing and heat-insulating functions, and can also realize the collection and release of solar energy. The functions of the original structure and equipment of the greenhouse are highly integrated to realize the light simplification and assembly of the solar greenhouse. The main advantages of the active heat storage greenhouse enclosure curtain wall are as follows: 1. All materials used are low-priced, with low cost, pollution-free and environmentally friendly. 2. Using the rear wall of the greenhouse as a system that can collect and release heat, compared with the previous active heat storage and release system, the heat collection area is nearly doubled, which greatly increases the amount of heat collected. 3. The collector base plate is removed, and the construction of the collector curtain wall and the greenhouse is organically combined. There is no need to consider the impact of the heat storage and release device on the logistics vehicle, and there is no need to increase the aisle width, thereby reducing the investment cost, increasing the heat collection efficiency, and increasing the effective cultivation area. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of the structure of the XPS-PVC composite wall material described in Example 1 of the present invention.

[0052] Figure 2 This is a schematic diagram of the fixed node structure of the XPS-PVC greenhouse rear wall splicing and self-tapping screw connection described in Example 2 of the present invention.

[0053] Figure 3 This is a schematic diagram of the fixed node structure of the XPS-PVC greenhouse rear wall splicing and nylon bolt connection described in Example 2 of the present invention.

[0054] Figure 4 This is a schematic diagram of the front structure of the greenhouse enclosure curtain wall with active heat storage according to Example 3 of the present invention.

[0055] Figure 5 This is a schematic diagram of the water flow under the black film of the greenhouse enclosure curtain wall with active heat storage according to Example 3 of the present invention.

[0056] Figure 6 This is a schematic diagram of the side structure of the greenhouse enclosure curtain wall with active heat storage according to Example 3 of the present invention.

[0057] Figure 7 This is a schematic structural diagram of the edge sealing method of the black film of the greenhouse enclosure curtain wall with active heat storage and the XPS-PVC greenhouse rear wall in Example 3 of the present invention.

[0058] Figure 8This is a schematic diagram of the cross-sectional structure of the sealing black film of the greenhouse enclosure curtain wall with active heat storage and the pressure strips used on the edge of the XPS-PVC greenhouse rear wall in Example 3 of the present invention.

[0059] Fig. 9 This is a schematic diagram of the water pressure conditions at three points a, b, and c in the upper water pipe of the greenhouse enclosure curtain wall with active heat storage in Example 3 of the present invention.

[0060] In the figure, 1 is a polyester fiber reinforced polyvinyl chloride (PVC) waterproof membrane, 2 is an extruded board (XPS), 3 is a mortise and tenon, 4 is a tenon strip, 5 is a heat seal welding, 6 is a steel frame, 61 is a steel frame vertical rod, 62 is a steel frame horizontal rod, 7 is an angle code, 8 is a self-tapping screw, 9 is a nylon bolt, 10 is a black film, 11 is a water tank, 12 is a water pump, 13 is a water supply pipe, 14 is a return pipe, 15 is an exhaust hole, 16 is a pressure strip, and the arrow is the direction of water flow. DETAILED DESCRIPTION

[0061] The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0062] In the examples, unless otherwise specified, the methods and equipment used are conventional methods and equipment in the art.

[0063] Example 1: XPS-PVC composite wall material

[0064] An XPS-PVC composite wall material structure of this embodiment is as follows Figure 1 As shown, it is a composite semi-rigid wall material composed of a polyester fiber reinforced polyvinyl chloride (PVC) waterproof membrane 1 as a wall material as a finishing layer, and a Class B flame-retardant extruded board (XPS) 2 sandwiched in the middle as a thermal insulation layer.

[0065] The thickness of the polyester fiber reinforced polyvinyl chloride (PVC) waterproofing coil is 1.2-2.0 mm, and the thickness of the extruded plastic sheet (XPS) is 100-120 mm. Each piece of the XPS-PVC composite wall material is rectangular, 3000 mm long, 600-1200 mm wide, and most commonly 600 mm wide.

[0066] The XPS-PVC composite wall material has tongue and groove 3 on four sides of the extruded board (XPS) so as to splice multiple XPS-PVC composite wall materials together.

[0067] The mortise and tenon groove 3 has a width of 5 mm and a depth of 20-25 mm. When in use, it is equipped with a mortise and tenon strip 4 having a thickness of 5 mm and a width of 40-50 mm.

[0068] When XPS-PVC composite wall materials are made manually, polyester fiber reinforced polyvinyl chloride (PVC) waterproof membrane uses self-adhesive type. When professional manufacturers make it, they use composite board adhesive to bond polyester fiber reinforced polyvinyl chloride (PVC) waterproof membrane to extruded board (XPS).

[0069] The manual production of the XPS-PVC composite wall material in this embodiment is as follows:

[0070] Material selection: Select Class B flame retardant extruded board (XPS), thickness 100-120 mm. Width: 600 mm, 1200 mm (600 mm width is the most common on the market) Length: 3000 mm. Polyester fiber reinforced polyvinyl chloride (PVC) waterproofing membrane selects 1.2 thick self-adhesive membrane with a width and length 3-5 mm larger than the XPS board on each side, and a width of 40 mm larger on each side. For example, if the board is 600 mm × 3000 mm wide, the membrane is 680 mm × 3010 mm. Use a woodworking milling machine to machine the mortise and tenon along the four sides of the extruded board (XPS), with a width of 5 mm and a depth of 20-25 mm. The center line of the mortise and tenon should be on the center line of the edge of the extruded board or completed as required by the drawing.

[0071] Production:

[0072] 1. Compact the edges and check to ensure that the edges are firmly bonded and there are no bubbles or hollows in the middle of the board.

[0073] 2. Turn it over and paste the next side.

[0074] 3. Use a portable electric trimmer to remove excess parts from the end of the coil.

[0075] Example 2: XPS-PVC greenhouse back wall

[0076] The XPS-PVC composite wall material of Example 1 is used to make the XPS-PVC greenhouse back wall, which is made of a steel frame to bear the greenhouse load, and multiple XPS-PVC composite wall materials are spliced ​​into wall panels (see the XPS-PVC greenhouse back wall splicing diagram Figure 2 , Figure 3 ), fix the wall panel on the steel frame 6 of the north wall of the greenhouse to obtain the XPS-PVC greenhouse back wall; the splicing is to spray foam glue on the two edges of the two adjacent wall materials in contact, insert the tongue strip 4 into the tongue groove 3 of the two contacting edges, and seal the joint.

[0077] Wallboard sealing: Generally, hot melt adhesive is used to fill the welding gap between two panels. The sealed seam is directly heat-sealed at the seam 5 (see Figure 2) sealing, welding sealing with hot melt adhesive filling, covering the joints with strips of polyester fiber reinforced polyvinyl chloride (PVC) waterproof membrane and then pressing the gaps with hot air welding sealing, or sealing with wide waterproof tape. The specific sealing method is selected according to the actual situation of the construction site, referring to the following factors:

[0078] 1. If the straightness of the board is very high and the seam between the boards is very small, you can directly use an electric soldering iron to solder it, which only consumes electricity and has the lowest cost.

[0079] 2. Use hot melt glue to point the joints, which requires the board seam to be smaller than the diameter of the extruded glue. It consumes electricity and materials and is slow.

[0080] 3. Use construction sealant to point the joints. The minimum requirement for the flatness of the board is required, but the operator must have certain technical operation capabilities.

[0081] This is a common practice in engineering. The above method is applicable to splicing in the width direction of the board.

[0082] 4. Hot air welding of covering strips. When the length direction of the plate is connected, use strips of polyester fiber reinforced polyvinyl chloride (PVC) waterproofing membrane to press the seam, and the plate corners are connected. Use polyester fiber reinforced polyvinyl chloride (PVC) waterproofing membrane to wrap and weld.

[0083] For the back slope of the greenhouse and important joints, the PVC coiled material strips can be welded with hot air at the joints to make them welded to the parent body as a whole. Of course, the gaps can also be sealed with 50mm wide waterproof tape.

[0084] Wallboard splicing: insert the tenon strip 4 made of 5mm thick and 40-50mm wide plywood into the tenon groove 3. Then continue to hoist the upper wallboard: spray a proper amount of foam glue on the contact surface of the two boards before hoisting, hoist the composite board and insert it into the tenon groove 3, leaving as little gap as possible between the boards.

[0085] Wall panel fixing: Use connecting parts to fix the composite wall panel to the greenhouse steel frame 6. Specifically, any one or more of cold heading clamp nuts, expansion bolts, nylon bolts, long drill tail self-tapping screws, etc. can be used for fixing. See the schematic diagram of the fixed node structure connected by self-tapping screws for details. Figure 2 , where the length of the self-tapping screw 8 is 70 mm. See the schematic diagram of the fixed node structure connected by nylon bolts. Figure 3 Among them, the nylon bolt 9 is M8 and the length is 120mm.

[0086] The wall of this embodiment has the following advantages compared with the cement composite wallboard:

[0087] 1. Lightweight. The insulation layer uses extruded polystyrene board (XPS), and its comprehensive performance should be much higher than that of cement composite board EPS board wall. The thickness of the polyester fiber reinforced polyvinyl chloride (PVC) in the facing layer is 1 / 7 to 1 / 4 of that of the cement board, and the weight is only 1 / 13 of that of the cement board.

[0088] 2. It overcomes the defect of cement board absorbing water, and will not cause cracking, debonding, expansion and deformation of greenhouse walls caused by water absorption. There is no need to make waterproof layer or paint finishing layer.

[0089] 3. Because the material itself is semi-hard and has a certain degree of resilience, it is in a sense more resistant to accidental impacts.

[0090] 4. The material has good heat-sealing welding performance and is simple and easy to operate. The operation can be completed using an ordinary hot air welding gun, and the performance after welding is reliable.

[0091] 5. Since the wall does not absorb water, it is possible to make the entire north wall of the greenhouse an active heat storage system.

[0092] 6. The cost should be lower than that of cement composite board wall, whether it is manufacturing cost, transportation cost or installation cost, it should be lower than that of cement composite board wall.

[0093] 7. Beautiful appearance can improve the visual experience of the greenhouse.

[0094] The present invention creates a new wall variety that combines the advantages of hard composite wall panels and soft wall panels, is moderately priced, and has excellent cost-effectiveness. The wall is light in weight, the load on the greenhouse steel frame can be reduced, and the load on the foundation is also reduced simultaneously (but the wind resistance requirement of the greenhouse is not reduced by using high-pullout-resistance spiral piles), and the construction cost is also reduced, which can be said to be weight reduction and efficiency improvement. In addition, there is no need to make a waterproof layer or apply a protective coating. Then the construction cost should be further reduced. The improvement goal of high cost-effectiveness has been achieved, and it is easy to promote and apply.

[0095] Example 3: Greenhouse enclosure curtain wall with active heat storage

[0096] The overall greenhouse installation structure diagram of the greenhouse enclosure curtain wall with active heat storage in this embodiment is shown in Figure 4 , the schematic diagram of water flow under the black film is shown in Figure 5 , the side structure diagram of the greenhouse enclosure curtain wall with active heat storage is shown in Figure 6 The active heat storage greenhouse curtain wall is composed of an XPS-PVC greenhouse rear wall, a black film 10, a water supply pipe 13, a water return pipe 14, and a water tank 11 equipped with a water pump 12.

[0097] Generally, the extruded boards produced on the market are 3 meters long and 60 cm wide. The active heat storage greenhouse enclosure curtain wall is generally built more than 3 meters high and more than 30 meters long, which is determined according to the specific size of the greenhouse, but it will definitely be larger than the size of a single extruded board, which will involve the horizontal and vertical splicing of multiple XPS-PVC composite wall materials. The XPS-PVC greenhouse back wall used in this embodiment is spliced ​​in the longitudinal and horizontal directions by the tongue strips 4 in the tongue groove 3, the seams are sealed, and it is fixed to the greenhouse steel frame 6 with self-tapping screws 8. Please refer to Example 2 for details.

[0098] A layer of black film 10 is covered on one side of the XPS-PVC greenhouse rear wall inside the greenhouse. The edge of the black film 10 and the XPS-PVC greenhouse rear wall are sealed, and there is a hollow space between the two. The upper water pipe 13 pumps water from a water tank 11 equipped with a water pump 12 into the space between the XPS-PVC greenhouse rear wall and the black film 10. It extends along the upper edge between the XPS-PVC greenhouse rear wall and the black film 10 to the edge of the black film 10 and the XPS-PVC greenhouse rear wall. The part of the upper water pipe 13 extending between the black film 10 and the XPS-PVC greenhouse rear wall is distributed with a number of small holes as water injection ports. After the water flows between the XPS-PVC greenhouse rear wall and the black film 10, it is guided back to the water tank 11 equipped with the water pump 12 from the return water pipe 14.

[0099] An exhaust hole 15 is also provided at the upper end between the rear wall of the XPS-PVC greenhouse and the black film 10 to discharge the air mixed in the water flow.

[0100] The edge of the black film 10 and the XPS-PVC greenhouse rear wall are sealed. The sealing method is shown in Figure 7 The black film 10 is sealed on the wall by the pressure strip 16 and the self-tapping screws 8. The length of the pressure strip 16 is the same as the length of the edge of the black film 10. The edges of the black film 10 are all pressed tightly by the pressure strip to prevent water leakage. The cross-sectional structure of the pressure strip 16 is shown in FIG. Figure 8 .

[0101] The part of the water pipe 13 extending between the black film 10 and the rear wall of the XPS-PVC greenhouse is provided with a number of small holes as water inlets. Fig. 9 This is a schematic diagram of the water pressure at points a, b, and c in the upper water pipe of the greenhouse enclosure curtain wall with active heat storage in Example 3 of the present invention. When water flows in the upper water pipe, the longer the flow distance, the lower the water pressure. When water flows in from point c, the water pressure at point b is definitely lower than that at point a. If uniform hole spacing and pore size are used, the water flow at point a will be very large, and the water flow will be smaller as it moves toward point b, resulting in uneven water flow in the black film. As to how to ensure that the water flow can pass through the black film evenly, the following methods are proposed:

[0102] The first method is to change the number of small holes. Water flows into the black film through many small holes on the water supply pipe. The greater the water pressure, the fewer holes are arranged at the same distance. The smaller the water pressure, the more holes are arranged at the same distance. This can ensure that the water flow rate of the entire pipe into the black film is the same. That is, the number of holes drilled at point b is greater than the number of holes drilled at point a. The specific number of holes needs to be determined based on the installation length of the water supply pipe, the pipe diameter, the water pump, the pressure drop in the pipe, etc., that is, it needs to be determined based on the specific construction conditions.

[0103] The second method is to change the diameter of the small hole. The hole at point a is smaller and the hole at point b is larger. That is, the hole is smaller where the water pressure is greater and the hole is larger where the water pressure is smaller. This will allow the water to flow evenly through the black film from the water pipe. The specific amount of holes also needs to be determined based on the installation length of the water pipe, the pipe diameter, the water pump, the pressure drop in the pipe, etc., that is, it needs to be determined based on the specific construction conditions.

[0104] The third method is to use the first and second adjustment methods at the same time, which also needs to be determined based on the installation length of the water supply pipe, pipe diameter, water pump, pressure drop in the pipe, etc., that is, it needs to be determined according to the specific construction conditions.

[0105] The method of using the greenhouse enclosure curtain wall with active heat storage is as follows:

[0106] 1) During the day, the water pump is operated to form a "water tank-black film on the wall-water tank" loop: the water pump causes water to flow from the water tank through the black film on the wall. After absorbing the heat energy provided by solar radiation and heating up, the water is discharged along the return pipe and flows back to the water tank, realizing a circulation flow and continuously absorbing heat until the water pump is turned off in the evening;

[0107] 2) At night, run the water pump to form a "water tank-black film on the wall-water tank" loop: the water pump makes water flow from the water tank through the black film on the wall, and the temperature drops after releasing the heat energy stored in the water. The water is discharged through the pipe and flows back to the water tank, so that the water circulates between the water tank and the heat storage and release device, continuously releasing heat until the water pump is turned off at dawn.

[0108] The above embodiments are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineers and technicians in the field should all fall within the protection scope of the claims of the present invention.

Claims

1. An active heat storage greenhouse curtain wall, characterized in that: It consists of an XPS-PVC greenhouse rear wall, a black film, a water supply pipe, a water return pipe, and a water tank equipped with a water pump; the black film covers one side of the XPS-PVC greenhouse rear wall in the greenhouse, the edges of the black film and the XPS-PVC greenhouse rear wall are sealed, and there is a hollow space between the two; the water supply pipe pumps water from the water tank equipped with a water pump into between the XPS-PVC greenhouse rear wall and the black film, and extends along the upper edge between the XPS-PVC greenhouse rear wall and the black film to the edge of the black film and the XPS-PVC greenhouse rear wall, and the portion of the water supply pipe extending between the black film and the XPS-PVC greenhouse rear wall is provided with a number of small holes as water injection ports; After the water flows through the back wall of the XPS-PVC greenhouse and the black film, it is led back to the water tank equipped with a water pump through the return pipe; The XPS-PVC greenhouse rear wall is composed of a greenhouse steel frame and wall panels; the greenhouse steel frame bears the greenhouse load; the wall panels are spliced ​​with multiple XPS-PVC composite wall materials, and the seams are waterproof and sealed; the wall panels are fixed on the greenhouse north wall steel frame to obtain the XPS-PVC greenhouse rear wall; The XPS-PVC composite wall material is a composite waterproof semi-rigid wall material composed of a polyester fiber reinforced polyvinyl chloride waterproof roll as a wall material as a finishing layer, and a Class B flame-retardant extruded board as an insulation layer; The XPS-PVC composite wall material has tongue and groove along four sides of the extruded board; The seam waterproof sealing is selected from one or more of direct soldering sealing, hot melt adhesive filling welding sealing, strip polyester fiber inner reinforced polyvinyl chloride waterproof membrane covering the seam and then pressing the gap hot air welding sealing, and wide waterproof tape gluing sealing.

2. The active heat storage greenhouse curtain wall according to claim 1, characterized in that: The thickness of the polyester fiber reinforced polyvinyl chloride waterproofing coiled material is 1.2-2.0 mm, and the thickness of the extruded board is 100-120 mm.

3. The active heat storage greenhouse curtain wall according to claim 1, characterized in that: The splicing is to spray foam glue on two contacting edges of two adjacent XPS-PVC composite wall materials, insert tenon strips into the tenon grooves of the two contacting edges, and splice them together.

4. The active heat storage greenhouse curtain wall according to claim 1, characterized in that: The fixing is performed by using any one or more of cold heading clamp nuts, expansion bolts, and long drill tail self-tapping screws.

5. The active heat storage greenhouse curtain wall according to claim 1, characterized in that: The edges of the black film and the XPS-PVC greenhouse rear wall are sealed. The black film is connected by a pressure strip and self-tapping screws that fix the pressure strip, the black film, and the XPS-PVC greenhouse rear wall in sequence. The length of the pressure strip is the same as the length of the edge of the black film. The edges of the black film are all pressed tightly with the pressure strip.

6. The active heat storage greenhouse curtain wall according to any one of claims 1 to 5, characterized in that: The plurality of small holes are arranged in the following manner: 1) The diameter of the small holes becomes larger along the extension direction of the water pipe; 2) The density of small holes increases along the extension direction of the water pipe; 3) Combine 1) and 2) to set a small hole.

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