A grain depot light-reflecting heat-insulating door

Abstract

The utility model discloses a grain house light reflection heat insulation door, including door frame, the door frame is equipped with outer door panel, heat insulation core layer and inner door panel from outside to inside in, two the outer door panel swing joint is in the door frame and has been coated with light reflection heat insulation paint on the outer surface, the hollow ventilation cavity is formed between the outer door panel and heat insulation core layer. The utility model has the advantages that through "passive reflection + active heat removal + passive block" three -level heat -insulation design, and heat -insulation efficiency is far higher than single heat preservation door, can make the door body inner surface temperature to reduce 10 DEG C to 20 DEG C or more, has solved the "accumulation effect" of heat in the door body, has effectively eliminated the local high temperature "hot spot" of the vicinity of storehouse door, has guaranteed the storage grain safety.

Description

Technical Field

[0001] This utility model relates to the field of warehouse door insulation technology, and in particular to a reflective insulation door for grain warehouses. Background Technology

[0002] Food security is a crucial cornerstone of national security, and food storage is a key link in ensuring food security. Temperature control is paramount during food storage. Excessively high temperatures accelerate grain respiration, moisture evaporation, and quality decline, while also promoting mold growth and pest reproduction, resulting in significant economic losses. Large, single-story grain silos typically have doors made of metal (such as steel). Metal has excellent thermal conductivity; in summer or in areas with strong sunlight, prolonged exposure of the doors to sunlight absorbs a large amount of solar radiation and conducts this heat into the grain silo. This causes a significant increase in temperature in localized areas near the door, creating "hot spots" that can easily become the starting point for grain quality deterioration. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a reflective and insulating door for grain storage.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A reflective heat-insulating door for grain storage includes a door frame; the door frame is provided with an outer door panel, a heat-insulating core layer and an inner door panel from the outside to the inside; two outer door panels are movably connected to the door frame and their outer surfaces are coated with reflective heat-insulating paint; a hollow ventilation cavity is formed between the outer door panels and the heat-insulating core layer.

[0006] Furthermore, an air inlet is provided on the top of the outer door panel, and an air outlet is provided on the bottom; an exhaust fan is provided on the air outlet.

[0007] Furthermore, the air inlet and air outlet have the same aperture; and both are fixedly connected with insect-proof nets; the exhaust fan is located outside the insect-proof net installed at the air outlet.

[0008] Furthermore, the thickness of the hollow ventilation cavity is 5cm to 10cm.

[0009] Furthermore, the thickness of the hollow ventilation cavity is 8 cm.

[0010] Furthermore, the outer and inner door panels are made of stainless steel.

[0011] Furthermore, the heat insulation core layer is made of one of polyurethane foam, rock wool, or vacuum insulation panels.

[0012] Furthermore, the inner side of the door frame is provided with double embedded sealing strips; the double embedded sealing strips are in contact with the outer door panel.

[0013] Furthermore, the double-layer embedded sealing strip is made of EPDM rubber.

[0014] The beneficial effects of this utility model are:

[0015] (1) Through the three-level heat insulation design of “passive reflection + active heat dissipation + passive blocking”, the heat insulation efficiency is much higher than that of a single heat insulation door, which can reduce the temperature of the inner surface of the door by 10°C to more than 20°C.

[0016] (2) It solved the "cumulative effect" of heat in the door body, effectively eliminated the local high temperature "hot spots" near the warehouse door, and ensured the safety of grain storage. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a partial schematic diagram of the transverse sectional view of this utility model;

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0020] In the picture,

[0021] 1-Door frame, 2-Outer door panel, 3-Hollow ventilation cavity, 4-Insulation core layer, 5-Inner door panel, 6-Reflective heat insulation coating, 7-Double embedded sealing strip;

[0022] 21-Air inlet, 22-Air outlet, 23-Exhaust fan, 24-Insect screen. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] Reference Figure 1-3As shown, a reflective heat-insulating door for grain storage is designed to solve the problem of heat transfer to the storage room due to solar radiation, causing localized temperature increases in the grain near the door, leading to grain spoilage, insect infestation, and condensation. This invention achieves efficient heat insulation and temperature control through a composite structure combining passive reflection and active heat dissipation. The reflective heat-insulating door includes a door frame 1; inside the door frame 1, from the outside in, are an outer door panel 2, a heat-insulating core layer 4, and an inner door panel 5; two outer door panels 2 are movably connected to the door frame 1 and their outer surfaces are coated with reflective heat-insulating paint 6; a hollow ventilation cavity 3 is formed between the outer door panel 2 and the heat-insulating core layer 4.

[0025] It should be noted that the door frame 1 is fixed at the opening in the grain silo wall. The door frame 1 is preferably made of thickened steel (e.g., Q345B carbon structural steel) to ensure sufficient structural strength and overall structural stability. A composite layered door is movably connected to the door frame 1. From the side facing the outside of the grain silo to the side facing the inside, the door consists of an outer door panel 2, a heat-insulating core layer 4, and an inner door panel 5. The outer door panel 2 serves as the light-facing surface and structural shell of the door, and its outer surface is uniformly coated with a reflective heat-insulating coating 6. This reflective heat-insulating coating 6 is the first barrier to achieve passive heat insulation in this invention. Its function is to maximize the reflection of visible light and near-infrared radiation from sunlight, reducing the absorption of solar heat energy by the door at the source. Preferably, the reflective heat-insulating coating 6 can be, for example, a white or light-colored coating doped with ceramic microspheres or rare earth oxides, with a solar reflectance preferably not less than 85% and a hemispherical emissivity not less than 90%, thus achieving both high reflectivity and high radiative heat dissipation. The outer door panel 2 and the heat insulation core layer 4 are not tightly fitted together, but are separated by internal supporting ribs (not shown), thus forming a hollow ventilation cavity 3 of a specific thickness between them. The presence of the hollow ventilation cavity 3 confines heat to the air inside the cavity, preventing it from being immediately conducted to the heat insulation core layer 4. The inner door panel 5 provides good insulation and support for the grain inside the grain silo.

[0026] Specifically, to effectively expel hot air from the hollow ventilation cavity 3, an air inlet 21 is provided above the outer door panel 2, and an air outlet 22 is provided below; an exhaust fan 23 is installed on the air outlet 22. It should be understood that the upper location of the air inlet 21 facilitates connection to an air conditioning unit used in grain silos, allowing some of the cool air to dissipate heat from the hollow ventilation cavity 3, while the air outlet 22 is used to expel hot air. To enhance heat dissipation, especially under windless or extremely sunny conditions, an exhaust fan 23 is also installed on the air outlet 22. This exhaust fan 23 is preferably a low-voltage DC axial fan, such as a DC12V or DC24V miniature fan of model FZY-120. The function of the exhaust fan 23 is to draw out the hot air from the upper part of the hollow ventilation cavity 3 when the temperature inside the cavity reaches a certain level, creating a negative pressure inside the cavity. This forces relatively cooler outside air to be drawn in through the lower air inlet 21, forming a continuous, bottom-up active air convection circulation. In this way, the heat absorbed by the outer door panel 2 is continuously carried away by the flowing air, greatly reducing the penetration of heat into the heat insulation core layer 4.

[0027] Specifically, in one embodiment, to simplify the manufacturing process and ensure ventilation efficiency, the air inlet 21 and air outlet 22 have the same aperture; and both are fixedly connected to an insect-proof net 24; the exhaust fan 23 is located outside the insect-proof net 24 installed at the air outlet 22. Of course, in another embodiment, according to fluid dynamics design, the total area of ​​the air inlet can be set slightly larger than or equal to the total area of ​​the air outlet to optimize air intake efficiency. Considering the special environment of the grain silo, to prevent insects, rodents, or debris from entering the hollow ventilation cavity 3 through the air inlet and air outlet, insect-proof nets 24 are fixedly connected to both the air inlet 21 and air outlet 22. The insect-proof net 24 is preferably made of 304 stainless steel wire mesh, with a mesh count preferably between 20 and 40 meshes, which effectively blocks pests without causing excessive resistance to airflow. When air flows out of the cavity, it passes through the insect-proof net 24 in sequence and is then discharged by the exhaust fan 23.

[0028] Specifically, the thickness of the hollow ventilation cavity 3 (i.e., the vertical distance between the outer door panel 2 and the heat insulation core layer 4) directly affects the heat dissipation effect. If the cavity is too thin, the airflow resistance is high and the heat dissipation efficiency is low; if the cavity is too thick, it will unnecessarily increase the overall thickness and weight of the door. Preferably, this utility model sets the thickness to 5cm~10cm (i.e. 50mm~100mm).

[0029] Specifically, within the above-mentioned preferred range (5cm~10cm), experiments have shown that when the thickness of the hollow ventilation cavity 3 is set to 8cm (i.e. 80mm), the best balance can be achieved between the overall thickness and weight of the door and the active heat dissipation efficiency.

[0030] Specifically, the material selection for each layer of the door panel is as follows: Both the outer door panel 2 and the inner door panel 5 are preferably made of stainless steel. The outer door panel 2 uses, for example, SUS304 stainless steel (thickness can be 1.5mm) to ensure excellent weather resistance, corrosion resistance, and structural strength. The inner door panel 5, as the layer that comes into direct or indirect contact with the storage environment (which may include grain dust, moisture, or fumigation gases), is preferably made of more corrosion-resistant SUS316L food-grade stainless steel (thickness can be 1.2mm) to ensure long-term rust prevention, avoidance of contamination of the grain storage environment, and ease of cleaning.

[0031] Specifically, the insulating core layer 4 is the second and final key barrier to achieve passive heat insulation in this invention. Its function is to completely block the transfer of any residual heat (i.e., heat that has not been completely carried away by the convective air) that may exist in the hollow ventilation cavity 3 into the chamber. Therefore, the insulating core layer 4 must be made of a material with extremely low thermal conductivity. In this invention, the insulating core layer 4 can be made of polyurethane foam, rock wool, or vacuum insulation board. As an example, if thermal insulation performance and lightweight are prioritized, rigid polyurethane foam (PUR) can be used for integral foaming and filling, which has a low thermal conductivity (approximately 0.024 W / (m·K)) and self-adhesive properties, enhancing the overall integrity of the door. If the highest fire resistance rating is required, Class A fire-resistant rock wool board can be used. As a preferred embodiment, a vacuum insulation panel (VIP) can be used, with a thermal conductivity as low as 0.004 W / (m·K). Using a vacuum insulation panel can achieve the same insulation effect while greatly reducing the thickness of the insulation core layer 4, thereby controlling the overall thickness of the door.

[0032] Specifically, in order to improve airtightness, the inner side of the door frame 1 is provided with double embedded sealing strips 7; the double embedded sealing strips 7 are in contact with the outer door panel 2.

[0033] Specifically, considering the potential for significant temperature fluctuations and chemical gas (fumigant) corrosion in grain storage environments, the double-layer embedded sealing strip 7 is made of EPDM rubber. EPDM material possesses excellent weather resistance, ozone resistance, high and low temperature resistance (-50℃ to 150℃), and chemical corrosion resistance, ensuring that the sealing strip does not age or crack during long-term use and maintains high elasticity, thus providing a durable and reliable sealing effect.

[0034] The working principle of this utility model:

[0035] When the sun shines, the reflective heat-insulating coating 6 first reflects away most of the heat; the remaining heat absorbed by the outer door panel 2 heats the air inside the hollow ventilation cavity 3; the exhaust fan 23 starts (preferably driven by solar energy or temperature control), expelling the hot air from the cavity through the lower air outlet 22, while cold outside air is introduced through the upper air inlet 21, forming an active heat removal cycle; residual heat that is not carried away or penetrates the cavity is completely blocked by the heat-insulating core layer 4; ultimately, the inner door panel 5 is kept at a low temperature close to the internal environment. At the same time, the double-embedded sealing strip 7 ensures the absolute airtightness of the door.

[0036] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A reflective and insulating door for grain storage, characterized in that: Includes a door frame (1); the door frame (1) is provided with an outer door panel (2), a heat insulation core layer (4) and an inner door panel (5) from the outside to the inside; the two outer door panels (2) are movably connected to the door frame (1) and their outer surfaces are coated with reflective heat insulation paint (6); a hollow ventilation cavity (3) is formed between the outer door panel (2) and the heat insulation core layer (4).

2. The grain warehouse reflective and insulating door according to claim 1, characterized in that: The outer door panel (2) has an air inlet (21) at the top and an air outlet (22) at the bottom; an exhaust fan (23) is provided on the air outlet (22).

3. The grain warehouse reflective and insulating door according to claim 2, characterized in that: The air inlet (21) and air outlet (22) have the same aperture; and both are fixedly connected with insect-proof nets (24); the exhaust fan (23) is located outside the insect-proof nets (24) installed at the air outlet (22).

4. The grain warehouse reflective and insulating door according to claim 1, characterized in that: The thickness of the hollow ventilation cavity (3) is 5cm to 10cm.

5. The grain warehouse reflective and insulating door according to claim 1, characterized in that: The thickness of the hollow ventilation cavity (3) is 8cm.

6. The grain warehouse reflective insulating door according to any one of claims 1 to 5, characterized in that: The outer door panel (2) and the inner door panel (5) are made of stainless steel.

7. The grain warehouse reflective insulating door according to any one of claims 1 to 5, characterized in that: The heat insulation core layer (4) is made of one of polyurethane foam, rock wool or vacuum insulation board.

8. The grain warehouse reflective door according to any one of claims 1 to 5, characterized in that: The door frame (1) is provided with a double embedded sealing strip (7) on the inner side; the double embedded sealing strip (7) is in contact with the outer door panel (2).

9. The grain warehouse reflective door according to claim 8, characterized in that: The double-layer embedded sealing strip (7) is made of EPDM rubber.

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