Self-powered double-layer micro-positive pressure sand-proof and heat-insulation container

Abstract

The application discloses a self-powered double-layer micro-positive-pressure sand-proof and heat-preservation container, which comprises a box body, outer cabins and inner cabins are arranged at two ends in the box body respectively, an outer cabin door is arranged at a movable end of the outer cabin, an airtight inner cabin door is arranged at a connecting end of the inner cabin and the outer cabin, a sand collecting system is arranged at the bottom of the outer cabin, a hollow air inlet interlayer for filtering wind sand is arranged at the top of the box body, the outer cabin and the inner cabin are communicated with the hollow air inlet interlayer through independent air supply units respectively, a temperature control and dehumidification system is arranged in the inner cabin, and a photovoltaic independent power supply system is arranged at the top of the box body; the outer cabin air blower is designed with double power, and the door magnetic linkage is used to realize door opening pre-pressurization and cooperates with the air curtain machine to block the sand dust from invading when the door is opened. The self-powered double-layer micro-positive-pressure sand-proof and heat-preservation container realizes multiple sand-proof, stable heat preservation, automatic temperature control and dehumidification and electrical equipment protection, can be operated for a long time without external power supply and unattended operation, can effectively block the sand dust from invading when the container is opened, and remarkably prolongs the service life of the field precision equipment.

Description

Technical Field

[0001] This invention relates to the field of field equipment protection technology, specifically to a self-powered double-layer micro-positive pressure sandproof and heat-insulating container suitable for storing precision electronic equipment, sensors, instruments and meters in extremely arid and windy areas (such as Xinjiang, western Inner Mongolia, and the Hexi Corridor in Gansu, my country). It is particularly suitable for remote field operation scenarios with no mains power coverage, large temperature differences between day and night, and frequent sandstorms. Background Technology

[0002] With the ongoing development and construction of western my country, field operations such as infrastructure construction, resource exploration, ecological environment monitoring, and scientific research in extremely arid and wind-blown sand areas, exemplified by Xinjiang, are becoming increasingly frequent. A large number of precision electronic devices, sensors, and testing instruments used in these operations often cannot be immediately installed and put into use after arriving at the work site due to factors such as weather conditions, personnel scheduling, and construction progress. They often need to be stored in the field for weeks or even months. Precision equipment has strict requirements regarding the dust concentration, temperature, and humidity of the storage environment. However, extremely arid and wind-blown sand areas are characterized by strong winds and sandstorms, large temperature differences, lack of mains power coverage, and unattended operation, placing extremely high demands on the environmental control capabilities and operational reliability of field storage devices.

[0003] Currently, the following types of devices are mainly used for storing equipment in outdoor settings: The first category is the ordinary standard freight container, which has a simple structure, low procurement cost, and convenient deployment. However, the cabin relies only on structural sealing for basic protection, has poor sand protection performance, and lacks thermal insulation structure and environmental control capabilities, making it impossible to maintain a stable internal storage environment without external power supply.

[0004] The second type is customized constant temperature and humidity containers, which are equipped with temperature control and sealing protection structures and can achieve certain environmental control functions. However, this type of device relies on external mains power supply and cannot be applied to remote field areas without mains power coverage. At the same time, its sand protection relies only on the static sealing of the cabin. When the container is opened, the pressure difference between the inside and outside will cause a large amount of sand and dust to enter the cabin instantly, making it difficult to ensure the safety of the equipment during the opening operation.

[0005] The third category consists of temporary prefabricated houses or protective tents, which are flexible to assemble and disassemble and require low initial investment. However, their structural wind resistance is insufficient, and their insulation and sand-proof performance is unstable. They are easily damaged by extreme weather and cannot meet the needs of long-term storage.

[0006] Based on a review of existing technical solutions and a survey and analysis of actual field application scenarios, the existing storage devices have the following technical limitations in application in extremely arid and windy areas: Firstly, the sand-proof mechanism is simplistic and lacks comprehensive protection. Existing devices mostly rely on the sealing strips of the cabin for static sand protection. However, in extreme sandstorm environments, these sealing strips are susceptible to wear and tear from sand and dust, as well as aging due to low temperatures, which can cause gaps that allow sand and dust to continuously infiltrate the cabin. During the unpacking process, there is a lack of active sand and dust blocking measures. The exchange of airflow between the inside and outside can carry a large amount of sand and dust into the cabin, which can cause irreversible damage to precision electronic equipment. At the same time, there is a lack of effective sand and dust collection and removal structures inside the cabin. The infiltrated sand and dust will accumulate on the surface of the equipment, which can easily lead to problems such as poor heat dissipation, poor electrical contact, and accelerated wear of mechanical parts.

[0007] Secondly, the energy supply adaptability is poor, making it unsuitable for long-term unattended operation. Existing storage devices with environmental control functions all rely on external mains power, but most field operation areas lack mains power coverage and cannot be directly utilized. A few solutions using diesel generators for supplemental power suffer from high fuel consumption, high operating noise, high maintenance frequency, and pollution emissions. Furthermore, diesel fuel is prone to solidification in low-temperature environments, making stable operation impossible in winter. Existing solutions using solar power suffer from unreasonable system energy consumption matching, insufficient energy storage capacity, and low energy consumption control accuracy, failing to meet the requirements for long-term unattended operation during continuous rainy weather.

[0008] Third, their insulation performance is insufficient, making them unsuitable for extreme temperature environments. Ordinary freight containers lack insulation structures, resulting in drastic temperature fluctuations inside the hold due to external environmental changes. The diurnal temperature range can exceed 30°C, with extreme winter temperatures dropping below -30°C and extreme summer temperatures exceeding 60°C. Existing insulated containers mostly use a single insulation material, resulting in limited overall insulation effectiveness. Furthermore, the metal frame of the hold exhibits a significant thermal bridging effect, leading to severe heat loss. Extreme temperature fluctuations can cause performance degradation and shortened lifespan of precision electronic equipment components, and in severe cases, can lead to equipment malfunctions, hardware damage, and other failures.

[0009] Fourth, the lack of humidity control leads to a significant risk of condensation. Most existing storage devices neglect humidity control. Although the climate in extremely arid and windy areas is generally dry, the temperature difference between day and night is large. When the temperature drops sharply at night, water vapor in the air inside the chamber can easily condense on the low-temperature equipment surface, leading to problems such as short circuits, metal corrosion, and mold growth on components, which seriously affect the reliability and service life of the equipment.

[0010] Fifth, the operation and maintenance are inconvenient, and the ability to adapt to unattended scenarios is weak. The electrical equipment of existing containers is mostly located in the low position inside the hold, which is easily covered by sand and dust. Moreover, maintenance work requires entering the hold, which will disrupt the stable storage environment inside the hold. The structure of the sand collection device is unreasonable, and the sand and dust cleaning operation is cumbersome. When sand and dust accumulate to a certain level, it will affect the normal operation of the device. Most devices lack intelligent automatic control and status monitoring functions, requiring personnel to conduct regular on-site inspections, resulting in high operation and maintenance costs and making them unsuitable for long-term unattended application requirements.

[0011] The aforementioned technical limitations result in a high rate of equipment damage when existing storage devices are used in field equipment storage scenarios in extremely arid and windy areas. This not only significantly increases equipment maintenance and replacement costs but also delays engineering construction and scientific research progress, affecting the continuity and accuracy of monitoring data. Therefore, there is an urgent need to develop a field equipment storage device that can operate stably for extended periods without external power supply, while also possessing efficient sand protection, reliable heat preservation, intelligent temperature control and dehumidification, and low maintenance costs, to meet the actual application needs of extremely arid and windy areas. Summary of the Invention

[0012] The technical problem to be solved by this invention is the poor protection effect of precision equipment in the field storage in extremely arid and windy areas, and the inability to operate for a long time without external power supply.

[0013] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a self-powered double-layer micro-positive pressure sandproof and heat-insulating container, including a container body, with an outer compartment and an inner compartment respectively set at both ends of the container body, an outer door set at the movable end of the outer compartment, an inner door set at the connection end between the inner compartment and the outer compartment, a sand collection system set at the bottom of the outer compartment, a hollow air intake jacket for wind and sand filtration set at the top of the container body, the outer compartment and the inner compartment being connected to the hollow air intake jacket through independent air supply units, a temperature control and dehumidification system set inside the inner compartment, and a power supply system installed at the top of the container body.

[0014] Preferably, the inner hatch is an airtight sliding door structure, and sealing strips are provided on both sides, bottom and top of the inner hatch. The sealing strips are high and low temperature resistant rubber sealing strips.

[0015] Preferably, the inner side of the metal wall of the inner cabin is provided with a double-layer insulation structure, which includes an outer high-density polyurethane insulation board and an inner vacuum insulation board. The inner side of the vacuum insulation board is fitted with an aluminum-plastic puncture-resistant protective layer, and the splicing gaps of the inner cabin are provided with high and low temperature resistant rubber sealing components.

[0016] Preferably, the hollow air intake interlayer includes a support frame, an air vent cavity is provided on the inner side of the support frame, louvers are provided on the outer side of the support frame, a sand and water resistant mesh is provided on the inner side of the support frame, a sealing cover is provided on the top of the support frame, and the air vent cavity is connected to the air intake end of the air supply unit.

[0017] Preferably, the louvers are metal fixed structures, and the surface of the louvers is provided with an anti-oxidation layer; the sand-proof and waterproof mesh is a fine stainless steel metal mesh with a mesh count of 80 to 100; and the sealing cover is a flame-retardant and waterproof polyurethane board.

[0018] Preferably, the air supply unit includes an outer cabin air supply fan and an air curtain machine. The outer cabin air supply fan is a dual-power fan, and a door magnetic detection unit is installed at the outer cabin door. The door magnetic detection unit is electrically connected to the outer cabin air supply fan and the air curtain machine. Under normal closed-door conditions, the outer cabin air supply fan continuously supplies air at a low power level, forming a continuous micro-positive pressure environment inside the outer cabin. Before the outer cabin door is opened, the door magnetic detection unit triggers the outer cabin air supply fan to switch to a high power level for pre-pressurization. When the outer cabin door is opened, the air curtain machine is started simultaneously. The outer cabin air supply fan maintains high power air supply to supplement the net outflow of air generated by the operation of the air curtain machine, maintaining a positive pressure state in the outer cabin throughout the process.

[0019] Preferably, when the outer cabin air supply fan is running at low power, a slightly positive pressure environment of 3-8 Pa is formed inside the outer cabin; after pre-pressurization at high power, the pressure difference of the outer cabin increases to 8-15 Pa.

[0020] Preferably, a pressure sensor is installed inside the inner cabin, and the pressure sensor is electrically connected to the intermittent controllable blower; the intermittent controllable blower starts and stops in conjunction with the control to maintain a micro-positive pressure environment of 5-10 Pa in the inner cabin, and the micro-positive pressure value of the inner cabin is always higher than that of the outer cabin.

[0021] Preferably, the power supply system includes a solar photovoltaic panel installed on the top of the enclosure and a sandproof cabinet installed high on the side wall of the outer cabin. The sandproof cabinet integrates a power distribution cabinet and an energy storage battery. The solar photovoltaic panel is electrically connected to the power distribution cabinet and the energy storage battery. The power distribution cabinet integrates a photovoltaic controller and an inverter.

[0022] Preferably, the sand collection system includes a funnel-shaped sand collection floor laid at the bottom of the outer cabin and a sand collection box installed at the lowest point of the funnel-shaped sand collection floor, and the sand collection box is detachable.

[0023] This invention provides a self-powered, double-layered, slightly positive-pressure sand-proof and heat-insulating container, which has the following beneficial effects.

[0024] 1. Significantly improved sand-proof performance during door opening, effectively solving the technical problem of severe sand and dust intrusion during unpacking operations. This invention adopts a control structure that links a dual-power outer cabin air supply fan with a door magnetic detection unit. Under normal closed conditions, it maintains the basic positive pressure of the outer cabin at low power. Before the outer cabin door is opened, it automatically switches to a high-power pre-pressurization setting. During the door opening process, it continuously supplies high-power air to supplement the outflow of air generated by the air curtain machine. Combined with the vertical air curtain formed by the air curtain machine above the outer cabin door, it maintains a positive pressure state in the outer cabin throughout the process. This avoids the defects of cabin depressurization and sand and dust backflow that are prone to occur when traditional air curtains are used in conjunction with positive pressure chambers, and greatly reduces the amount of sand and dust intrusion during door opening operations.

[0025] 2. A dual-layer gradient micro-positive pressure full-chain sand-prevention system is constructed, significantly enhancing comprehensive protection capabilities. This invention utilizes an inner and outer dual-chamber isolation structure to create a gradient pressure difference where the inner chamber pressure is higher than the outer chamber pressure, and the outer chamber pressure is higher than the external environment. Airflow maintains a unidirectional flow from the inner chamber to the outer chamber and then to the outside. Combined with the louvers of the top hollow air intake layer, the sand-proof and waterproof mesh primary filtration structure, and the funnel-shaped sand collection structure at the bottom of the outer chamber, a complete sand-prevention chain is formed. Compared to existing devices that rely solely on static sealing, this system effectively resists the intrusion of sand and dust through gaps caused by aging and cracking of the sealing strips, ensuring the long-term safety of precision equipment stored in the inner chamber.

[0026] 3. The photovoltaic independent power supply has strong adaptability and can support long-term unattended operation. This invention uses monocrystalline silicon photovoltaic panels and lithium iron phosphate energy storage batteries to form an independent power supply system, which does not rely on external mains power. Combined with a graded energy consumption control strategy, the outer cabin fan runs continuously at low power under normal conditions and provides short-term high-power pressure replenishment when the door is open. The inner cabin fan starts and stops intermittently to control the pressure. While ensuring the sand protection effect, it significantly reduces the overall energy consumption of the system. It can be adapted to remote field areas without mains power coverage, avoiding the defects of diesel power supply solutions such as high fuel consumption, easy solidification at low temperatures, and frequent maintenance, and meeting the needs of long-term unattended operation.

[0027] 4. Combining composite insulation with intelligent temperature and humidity control, adapting to extreme temperature difference environments. This invention employs a double-layer insulation structure composed of high-density polyurethane insulation board and vacuum insulation board. The outer polyurethane insulation layer counteracts the thermal bridging effect of the metal frame, while the inner vacuum insulation board serves as the core insulation layer, resulting in superior insulation efficiency compared to traditional single insulation materials. Combined with an automatically starting and stopping PTC heating plate and a dehumidification module with built-in humidity detection, the internal temperature and humidity can be stabilized within the suitable range for the equipment, effectively reducing temperature fluctuations caused by extreme day-night temperature differences, preventing low-temperature damage and condensation corrosion, and improving the reliability of equipment storage.

[0028] 5. Convenient operation and maintenance, suitable for low-frequency field applications. This invention centrally arranges electrical equipment such as power distribution cabinets and energy storage batteries in a high-level sand-proof cabinet on the outer side wall, eliminating the need to enter the inner cabin for routine maintenance and preserving the stable storage environment inside. The bottom of the outer cabin features a detachable sand collection box with snap-fit ​​connections, making sand and dust removal easy. The entire structure uses a standard container frame and universal components, ensuring high structural reliability and convenient component replacement, effectively reducing field operation and maintenance costs and inspection frequency. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is an overall outline drawing provided for an embodiment of the present invention.

[0030] Figure 2 Cross-sectional views of the inner and outer compartments provided for embodiments of the present invention.

[0031] Figure 3 This is a schematic diagram of the air intake system provided in an embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram of a funnel-shaped sand collection floor provided in an embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of a temperature-controlled dehumidification and dust prevention system provided in an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures: 1. Container body; 101. Outer compartment; 102. Inner compartment; 103. Outer compartment door; 104. Inner compartment door; 2. Hollow air intake interlayer; 201. Louvers; 202. Sandproof and waterproof mesh; 203. Sealing cover plate; 3. Solar photovoltaic panels; 4. Funnel-shaped sand collection floor; 401. Sand collection box; 5. Air curtain machine; 501. External cabin ventilation fan; 502. Intermittent controllable ventilation fan; 6. Sandproof cabinet; 601. Power distribution cabinet; 602. Energy storage battery; 7. PTC heating plate; 701. Temperature sensor; 702. Dehumidifier; 703. Pressure sensor. Detailed Implementation

[0035] As shown in Figures 1 to 5, this invention provides a self-powered double-layer micro-positive pressure sand-proof and heat-insulating container. The overall structure is an integrated container design, with the core consisting of inner and outer double-layer cabins, a top air intake system, an outer cabin sand collection system, a windproof and sand-supplying air system, an electrical power supply system, an inner cabin temperature control and dehumidification system, and a wind-resistant fixing structure. These systems work together to achieve sand-proof, heat-insulating, and automatic temperature control and dehumidification functions without external power supply. The positional relationships, connection relationships, and structural features of each component are as follows: As shown in Figures 1 and 2, the device is a box 1, divided into an outer compartment 101 and an inner compartment 102. The outer compartment is connected to the outside world by an outer door 103 for easy personnel access and equipment maintenance. The inner compartment 102 is connected to the outer compartment 101 and has an inner door 104. The inner door 104 adopts a sliding door structure with good airtightness, and with sealing strips, it further improves the sealing and insulation effect of the inner compartment. The inner compartment 102 is a sealed structure with good airtightness. The inner side of the metal wall of the inner compartment has a double-layer insulation structure, consisting of a 20mm high-density polyurethane insulation board and a 15mm vacuum insulation board from the outside to the inside. The inner side of the vacuum insulation board is covered with a 0.5mm thin aluminum-plastic puncture-resistant protective layer. All metal parts are hot-dip galvanized for corrosion protection, and the sealing parts are made of high and low temperature resistant rubber. The outer compartment connects to the outside world via only one opening, the outer door (103). All bolted joints and hull seams are sealed with high and low temperature resistant sealant. Based on experience with container airtightness ratings and enclosure structure leakage engineering, the natural air leakage per unit area of ​​the outer compartment is controlled to ≤1.0 m³ / (h). m²); the inner cabin is a fully sealed airtight structure, with a natural air leakage rate per unit area ≤0.3 m³ / (h). m²).

[0036] Preferably, the inner cabin door 104 is an airtight sliding door, and the door panel is equipped with rubber sealing strips that can withstand high and low temperatures from -40℃ to 80℃, further improving the sealing and insulation effect of the inner cabin; the double-layer insulation structure is fixed to the inner side of the inner cabin metal wall by bonding with flame-retardant structural adhesive and metal pressure strips, the outer polyurethane insulation board offsets the thermal bridge effect, and the inner vacuum insulation board serves as the core insulation layer to achieve a high-efficiency heat insulation effect.

[0037] As shown in Figure 3, the top of the container is enclosed by its own crossbeams to form a closed hollow air intake layer 2. The volume of the hollow air intake layer 2 is adapted to the air intake requirements of the outer cabin blower 501 and the intermittent controllable blower 502, ensuring smooth air intake without negative pressure. The hollow air intake layer 2 has symmetrical openings on the left and right sides. Louvers 201 are fixed to the outside of the openings with bolts. The louvers 201 are sand-proof and rain-proof louver structures that can block rainwater and large particles of sand and dust from entering. Sand-proof and waterproof mesh 202 is fixedly installed inside the openings. The sand-proof and waterproof mesh 202 is made of fine metal mesh, which can filter fine sand and dust and also has a waterproof function. A sealing cover plate 203 is laid on top of the hollow air intake layer 2. The sealing cover plate 203 is made of waterproof material to prevent rainwater from seeping into the interior of the hollow air intake layer 2. A solar photovoltaic panel 3 is fixed on top of the sealing cover plate 203 by a bracket. The solar photovoltaic panel is electrically connected to the electrical equipment below for power generation.

[0038] Preferably, the louver 201 is a metal fixed structure and is treated with anti-oxidation; the sandproof and waterproof mesh 202 is a fine metal mesh of 304 stainless steel with a mesh count of 80-100; the sealing cover 203 is a flame-retardant and waterproof polyurethane board; and the solar photovoltaic panel 3 is a monocrystalline silicon photovoltaic panel, the power of which is adapted to the total power requirements of all electrical components in the container.

[0039] As shown in Figure 4, a funnel-shaped sand collection floor 4 is laid at the bottom of the outer cabin. The floor is made of hot-dip galvanized steel plate and is funnel-shaped. It slopes from all sides towards the sand collection opening with an angle of 15°. The lowest point of the funnel-shaped sand collection floor 4 has a sand collection opening. Below the sand collection opening, a sand collection box 401 is detachably connected by a buckle. The sand collection box 401 is made of hard plastic or stainless steel. The top opening is aligned with the sand collection opening to catch the sand and dust sliding down from the funnel floor. The height of the sand collection box does not exceed 30cm to facilitate manual removal and cleaning.

[0040] Preferably, the sand collection box 401 is connected to the sand collection port by a snap-fit ​​and a sealing gasket is provided to prevent sand and dust from leaking from the connection.

[0041] As shown in Figures 2 and 5, an air curtain machine 5 is fixedly installed on the crossbeam of the cabin above the outer hatch 103 via a bracket. The air outlet of the air curtain machine 5 faces the inside of the outer hatch 103. When opened, it forms a vertical air curtain to block external sand and dust from entering the outer cabin 101. An outer cabin blower 501 is installed at the center of the top of the outer cabin 101. It draws air from the hollow air intake layer 2 and supplies air into the outer cabin 101. This air intake is used for the air curtain machine 5 and to establish a positive pressure environment in the outer cabin 101, preventing sand and dust from entering through the gaps in the outer hatch and the seams of the cabin. A door magnetic detection unit is installed at the outer hatch 103. The door magnetic detection unit is electrically connected to the outer cabin blower 501 and the air curtain machine 5 to realize the linkage control of door opening pre-pressurization.

[0042] An intermittently controllable blower 502 is bolted to the center of the top of the inner compartment 102. The air inlet of the intermittently controllable blower 502 is connected to the hollow air inlet jacket 2 at the top, and the air outlet faces inwards towards the inner compartment 102. When operating, the intermittently controllable blower 502 draws in filtered clean air from the hollow jacket and delivers it inwards. When not operating, the blower outlet is closed to prevent direct air exchange between the inner compartment and the outside, which could reduce insulation performance. The outlet of the intermittently controllable blower 502 is equipped with an automatically closing heat-insulating and windproof plate. When the blower stops, the plate closes to prevent heat loss and dust backflow from the inner compartment.

[0043] A pressure sensor 703 is fixedly installed in the middle of the side wall of the inner cabin 102. The pressure sensor 703 is electrically connected to the intermittent controllable blower 502 and the power distribution cabinet 601, providing intelligent detection and control signals for the slight positive pressure in the inner cabin. The pressure sensor 703 detects the internal pressure value of the inner cabin 102 in real time. When the detected value is lower than 5Pa, the power distribution cabinet 601 automatically sends a command to control the intermittent controllable blower 502 to turn on and supply air to the inner cabin to replenish pressure. When the detected value is higher than 10Pa, the power distribution cabinet 601 automatically sends a command to control the intermittent controllable blower 502 to turn off, so as to avoid damage to the sealing strip and double-layer insulation structure due to excessive pressure in the inner cabin, and achieve accurate and stable maintenance of a slight positive pressure of 5-10Pa in the inner cabin.

[0044] The outer cabin maintains positive pressure using a dual-power fan with staged air delivery. Under normal closed-door conditions, it operates at low power continuously, maintaining a slight positive pressure of 3-8 Pa, suitable for daily sealing and sand prevention needs. Before opening the door, it automatically switches to a high-power pre-pressurization setting, increasing the pressure difference of the outer cabin to 8-15 Pa. After opening the door, it works in conjunction with the air curtain to supplement the net outflow of air from the air curtain, preventing sand and dust from flowing back into the outer cabin due to depressurization. The outer and inner cabins work together to form a double-layer gradient slight positive pressure sand prevention structure, balancing sand prevention effectiveness, equipment safety, and energy efficiency.

[0045] Preferably, the pressure sensor 703 is a high and low temperature resistant pressure sensor adapted to extreme outdoor environments, with an operating temperature range of -40℃ to 80℃ and an operating power consumption of ≤0.5W. It shares a set of L-shaped metal mounting brackets with the temperature sensor 701, with a center-to-center distance of 5-6cm between the two, and both are set towards the center of the inner cabin, saving inner cabin installation space.

[0046] In this embodiment, the outer cabin maintains an airflow balance under door-opening conditions, ensuring that the outer cabin does not experience negative pressure loss during air curtain operation:

[0047] In the formula, The air volume of the outer cabin air supply fan at the high power setting is 1000 m³ / h in this embodiment; The natural air leakage rate of the outer compartment is calculated based on the engineering values ​​for slight positive pressure air leakage in the enclosure structure as specified in the "Cleanroom Design Code" GB 50073. Considering the airtightness of the sealed container, the overall natural air leakage rate of the outer compartment under an 8Pa pressure difference is approximately 24 m³ / h. This represents the net outward airflow during air curtain operation. Under normal flat-sill conditions, the net outward airflow rate of a cross-flow air curtain after the air curtain hits the ground is approximately 30%. In this embodiment, the rated airflow of the air curtain is 2000 m³ / h, corresponding to a net outflow of approximately 600 m³ / h. Substituting the values, the inequality is verified to hold, indicating that the outer cabin can maintain stable positive pressure during door opening, with no risk of sand or dust backflow.

[0048] The double-layered hull satisfies the gradient sand-prevention pressure difference relationship:

[0049] In the formula, The pressure difference between the inner chamber and the outside is 5-10 Pa. This refers to the pressure difference between the outer cabin and the outside environment. The critical gradient pressure difference to prevent residual sand and dust from the outer compartment from intruding into the inner compartment is set at 1.5 Pa. In this embodiment, the minimum gradient pressure difference between the inner and outer compartments is 2 Pa, which is greater than the critical gradient pressure difference and can effectively prevent sand and dust from the outer compartment from spreading into the inner compartment.

[0050] As shown in Figure 5, a sandproof cabinet 6 is mounted high on the side wall of the outer cabin 101. The power distribution cabinet 601 and the energy storage battery 602 are integrated inside the sandproof cabinet 6. The power distribution cabinet 601 integrates a photovoltaic controller and an inverter. The solar photovoltaic panels, photovoltaic controller, energy storage battery, and inverter are electrically connected in sequence to form a complete power supply circuit.

[0051] Preferably, the sandproof cabinet 6 is a rainproof and dustproof stainless steel cabinet with an IP65 protection rating; the energy storage battery 602 is a lithium iron phosphate battery, suitable for high and low temperature outdoor environments; and the power supply circuit provides power to the air curtain machine 5, each blower, the PTC heating plate 7, and the dehumidifier 702.

[0052] In this embodiment, the photovoltaic power supply system satisfies the long-term energy supply and demand balance, ensuring continuous and stable operation even without external power supply.

[0053] In the formula, To measure the average daily power generation of the monocrystalline silicon photovoltaic panel, this embodiment uses a 550W monocrystalline silicon photovoltaic panel. In the extremely arid and windy areas, the average daily effective sunlight is 7 hours in summer and 3.5 hours in winter. The overall efficiency of the photovoltaic power supply system, including line loss and MPPT conversion loss, is taken as 0.8. The charge / discharge efficiency of the lithium iron phosphate battery is set to 0.9. This represents the average daily comprehensive energy consumption of the container system. The value is 0.01 kWh, representing the average daily self-discharge loss of the energy storage battery.

[0054] According to calculations, the system's average daily total energy consumption under winter operating conditions is about 1.25 kWh. The average daily effective power generation in winter is greater than the sum of the average daily total energy consumption and self-discharge loss, so equation (3) holds true. Under continuous rainy weather, the available capacity of the energy storage battery can cover the energy consumption gap, ensuring the stable operation of the system.

[0055] As shown in Figure 5, PTC heating plates 7 are wall-mounted on the lower middle part of both side walls of the inner cabin 102 via brackets. The PTC heating plates 7 are wall-mounted and fixed to the inner surface of the insulation layer of the inner cabin 102, without being embedded inside the insulation layer. Two PTC heating plates are arranged symmetrically on the left and right sides to ensure uniform temperature distribution in the inner cabin 102. A temperature sensor 701 is fixedly installed on the middle side wall of the inner cabin 102. The temperature sensor 701 is electrically connected to the PTC heating plate 7 and is used to detect the real-time temperature of the inner cabin 102. A dehumidifier 702 is wall-mounted on the lower part of the side wall at the corner of the inner cabin 102. The dehumidifier 702 has a built-in humidity detection module, which can automatically detect the humidity of the inner cabin and perform dehumidification operation.

[0056] Preferably, the temperature sensor 701 is a thermistor sensor, which can control the PTC heating plate 7 to automatically start and stop to achieve constant temperature in the cabin; the dehumidifier 702 is a small dehumidifier, which is wall-mounted on the lower part of the corner side wall of the cabin 102 and can automatically start and stop according to the humidity in the cabin.

[0057] The double-layer composite insulation structure of the inner cabin satisfies the steady-state heat loss relationship, including thermal bridge correction:

[0058] In the formula, This represents the total steady-state heat loss per unit time in the inner cabin. The overall thermal conductivity of the double-layer composite insulation structure is calculated to be approximately 0.008 W / (m²). K); The total heat dissipation area of ​​the six-sided enclosure structure of the inner compartment is calculated to be 49m², based on the actual size of the inner compartment of a 20-foot container, which occupies 2 / 3 of the volume. The maximum design temperature difference between the interior cabin and the outside environment is set at 32K for extreme winter conditions. The correction factor for thermal bridge losses caused by the metal frame and bolted connections is set to 0.12. Substituting this into the calculation, the total steady-state heat loss per unit time in the interior cabin is approximately 14W. A 50W DC PTC heating plate is sufficient to meet the winter insulation requirements.

[0059] Preferably, the enclosure is secured to the ground by using anchor bolts that fit the base corner fittings, which are then connected to a steel plate embedded in a concrete foundation. High-strength bolts are used to rigidly connect the anchor bolts and the embedded steel plate, thus firmly fixing the enclosure to the ground. This fixing method is a mature and widely used structure in the industry, offering convenient installation, strong wind resistance, and effectively resisting the lateral thrust from strong winds and sandstorms, preventing the enclosure from shifting. Furthermore, it does not interfere with the internal structures such as sand collection, temperature control, or air intake systems. The high-strength bolts are grade 8.8 hot-dip galvanized high-strength bolts, and the embedded steel plate is Q235B steel plate with a thickness of not less than 10mm.

[0060] The following formulas are used to show that the device for implementing the present invention satisfies the following structural mechanical constraints, ensuring long-term stable operation in extreme environments such as strong winds and snow accumulation.

[0061] Bending strength verification of the top photovoltaic support:

[0062] In the formula, Let be the maximum bending moment at mid-span of the support, q be the uniformly distributed load borne by the support, and L be the calculated span of the support. The yield strength of the support steel. This is the net section modulus of the support steel.

[0063] In this embodiment, the photovoltaic support structure uses Q235B 40×40×2mm square steel, with a calculated span of 1.2m, and can withstand a uniformly distributed load of 0.85kN / m (including wind load and snow load); the steel yield strength is 235MPa, and the net section modulus of the square steel is 3.67×10⁻⁶. -6 m³. The maximum bending moment at mid-span is calculated to be 153 N. m, less than the allowable bending moment of the section, 862.45 N. m, which meets the requirements of GB 50017-2017 "Standard for Design of Steel Structures".

[0064] Top photovoltaic support deflection check:

[0065] In the formula, Let E be the maximum deflection at mid-span of the support, E be the elastic modulus of the steel, and I be the moment of inertia of the steel section of the support.

[0066] In this embodiment, the elastic modulus of the steel is 206 GPa, and the moment of inertia of the square steel section is 7.34 × 10⁻⁶ GPa. -8 m 4 Calculations show that the maximum deflection at mid-span of the support is 1.52 mm, which is less than the allowable deflection of 4.8 mm, and there is no risk of sagging deformation.

[0067] Micro-positive pressure deformation check of corrugated steel plates in the cabin

[0068] In the formula, denoted as ρ, where p is the maximum deformation of the corrugated steel plate, ρ is the maximum micro-positive pressure inside the cabin, a is the calculated width of a single wave of the corrugated plate, D is the bending stiffness per unit width of the corrugated steel plate, and k is the boundary condition coefficient for the thin plate.

[0069] In this embodiment, the cabin is constructed using 2mm thick corrugated steel plates, with a single corrugated plate width of 0.2m. The maximum design pressure difference within the cabin is 10Pa, the boundary coefficient for simply supported sides is 0.044, and the bending stiffness per unit width is 137N. m. Calculations show that the maximum deformation of the steel plate is about 0.0026 mm, which is much smaller than the compression allowance of the sealing strip. Under long-term slight positive pressure, there is no problem of bulging or sealing failure.

[0070] Wind resistance horizontal bearing capacity check of the entire machine's anchor fixing structure:

[0071] In the formula, The horizontal wind load borne by the box enclosure. Where is the air density, and v is the design maximum wind speed. Here, A represents the wind resistance coefficient of the enclosure, N represents the frontal area of ​​the enclosure, and N represents the number of torsion locks on the feet. The shear bearing capacity of a single anchor twist lock.

[0072] This embodiment is designed for a maximum wind speed of 28 m / s, an air density of 1.4 kg / m³, a drag coefficient of 1.3, and a windward area of ​​6 m². It is equipped with four standard container anchor twist locks, located at the four corners of the container's bottom, with each lock having a shear capacity of 10 kN. Calculations show that the total horizontal wind load is approximately 4.24 kN, far less than the total shear capacity of 40 kN, eliminating the risk of slippage or overturning of the container under extreme wind conditions.

[0073] During implementation, the first step is as follows: Before personnel enter the outer cabin 101, the door magnetic detection unit triggers the outer cabin air supply fan 501 to switch to a high-power pre-pressurization mode. After the outer cabin pressure reaches the set value, the outer cabin door opens, and the air curtain machine 5 is simultaneously activated to form a vertical air curtain, preventing external sand and dust from entering the outer cabin 101 with the door opening. The air pressure sensor 703 on the side wall of the inner cabin 102 monitors the inner cabin air pressure in real time. When the detected air pressure is lower than 5Pa, the power distribution cabinet 601 automatically controls the intermittent controllable air supply fan 502 to start, drawing in clean air filtered by louvers 201 and sand and waterproof mesh 202 from the top hollow air intake jacket 2, and supplying air to the inner cabin 102 to replenish pressure. When the detected air pressure is higher than 10Pa, the power distribution cabinet 601 automatically controls the intermittent controllable air supply fan 502. When the fan stops, the automatically closing heat-insulating and windproof plate of the air outlet closes simultaneously, maintaining a stable slightly positive pressure inside the inner chamber 102, further preventing external sand and dust from flowing back into the inner chamber 102 through the gaps in the chamber. A small amount of sand and dust entering the outer chamber 101 slides down the inclined surface of the funnel-shaped sand collection floor 4 under the action of gravity and airflow, and falls into the sand collection box 401 through the sand collection port.

[0074] Step 2: When a lot of sand and dust accumulates in the sand collection box 401, remove the sand collection box from below the sand collection port, open the outer hatch to empty the sand and dust, and then reinstall it using the clips to complete the cleaning. The whole process is simple and convenient, and there is no need to disassemble other parts.

[0075] Step 3: Temperature sensor 701 monitors the interior temperature in real time. When the interior temperature 102 is lower than the preset threshold, temperature sensor 701 sends a signal to control the PTC heating plate 7 to turn on. The heat emitted by the PTC heating plate 7 directly enters the interior 102, raising the temperature of the interior 102. When the interior temperature 102 reaches the preset threshold, the PTC heating plate 7 automatically turns off, achieving automatic temperature control in the interior. The humidity detection module built into dehumidifier 702 monitors the interior humidity in real time. When the humidity is higher than the preset threshold, dehumidifier 702 automatically turns on to dehumidify the air in the cabin. After dehumidification is completed, it automatically turns off to prevent condensation in the interior 102 and protect the internal equipment.

[0076] Step 4: During the day, solar photovoltaic panels 3 absorb solar energy and convert it into electrical energy. After processing by the photovoltaic controller, a portion of the electrical energy directly powers equipment such as the air curtain machine 5, various blowers, PTC heating plates 7, and dehumidifier 702. The remaining electrical energy is stored in the energy storage battery 602. At night or when there is insufficient sunlight, the energy storage battery releases electrical energy to power the equipment, ensuring its normal operation. The barometric pressure sensor 703 is a low-power industrial sensor, powered by the photovoltaic power supply system, which increases the overall energy consumption of the container almost without adding to its overall energy consumption. It is perfectly suited for operation without external power supply and long-term unattended operation.

Claims

1. A self-powered, double-layered, slightly positive-pressure, sand-proof, and heat-insulating container, characterized in that: The container includes a housing (1), with an outer chamber (101) and an inner chamber (102) at both ends. An outer door (103) is provided at the movable end of the outer chamber (101), and an inner door (104) is provided at the connection end between the inner chamber (102) and the outer chamber (101). A sand collection system is provided at the bottom of the outer chamber (101), and a hollow air intake jacket (2) for wind and sand filtration is provided at the top of the housing (1). The outer chamber (101) and the inner chamber (102) are connected to the hollow air intake jacket (2) through independent air supply units. A temperature control and dehumidification system is provided inside the inner chamber (102), and a power supply system is installed at the top of the housing (1).

2. The self-powered double-layer micro-positive pressure sand-proof and heat-insulating container as described in claim 1, characterized in that: The inner hatch (104) is an airtight sliding door structure. Sealing strips are provided on both sides, bottom and top of the inner hatch (104). The sealing strips are high and low temperature resistant rubber sealing strips.

3. The self-powered double-layer micro-positive pressure sand-proof and heat-insulating container as described in claim 1, characterized in that: The inner wall of the inner cabin (102) is provided with a double-layer insulation structure, which includes a high-density polyurethane insulation board on the outer side and a vacuum insulation board on the inner side. An aluminum-plastic anti-puncture protective layer is attached to the inner side of the vacuum insulation board. High and low temperature resistant rubber sealing components are provided at the splicing gaps of the inner cabin (102).

4. The self-powered double-layer micro-positive pressure sand-proof and heat-insulating container as described in claim 1, characterized in that: The hollow air intake interlayer (2) includes a support frame, an air vent cavity is provided on the inner side of the support frame, a louver (201) is provided on the outer side of the support frame, a sand and water resistant mesh (202) is provided on the inner side of the support frame, and a sealing cover plate (203) is provided on the top of the support frame. The air vent cavity is connected to the air intake end of the air supply unit.

5. The self-powered double-layer micro-positive pressure sand-proof and heat-insulating container as described in claim 4, characterized in that: The louver (201) is a metal fixed structure, and the surface of the louver (201) is provided with an anti-oxidation layer; the sandproof and waterproof mesh (202) is a fine stainless steel metal mesh with a mesh count of 80 to 100; the sealing cover (203) is a flame-retardant and waterproof polyurethane board.

6. The self-powered double-layer micro-positive pressure sand-proof and heat-insulating container as described in claim 1, characterized in that: The air supply unit includes an outer cabin air supply fan (501) and an air curtain machine (5). The outer cabin air supply fan (501) is a dual-power air supply fan. A door magnetic detection unit is provided at the outer cabin door (103). The door magnetic detection unit is electrically connected to the outer cabin air supply fan (501) and the air curtain machine (5).

7. The self-powered double-layer micro-positive pressure sand-proof and heat-insulating container as described in claim 6, characterized in that: When the outer cabin blower (501) is running at low power, a micro-positive pressure environment of 3-8 Pa is formed inside the outer cabin; after pre-pressurization at high power, the pressure difference of the outer cabin increases to 8-15 Pa; a pressure sensor (703) is installed inside the inner cabin (102), and the pressure sensor (703) is electrically connected to the intermittent controllable blower (502); the intermittent controllable blower (502) controls the start and stop of the inner cabin to maintain a micro-positive pressure environment of 5-10 Pa, and the micro-positive pressure value of the inner cabin is always higher than that of the outer cabin.

8. The self-powered double-layer micro-positive pressure sand-proof and heat-insulating container as described in claim 1, characterized in that: The power supply system includes a solar photovoltaic panel (3) installed on the top of the enclosure (1) and a sandproof cabinet (6) installed on the high side wall of the outer cabin (101). The sandproof cabinet (6) integrates a power distribution cabinet (601) and an energy storage battery (602). The solar photovoltaic panel (3) is electrically connected to the power distribution cabinet (601) and the energy storage battery (602). The power distribution cabinet (601) integrates a photovoltaic controller and an inverter.

9. The self-powered double-layer micro-positive pressure sand-proof and heat-insulating container as described in claim 1, characterized in that: The sand collection system includes a funnel-shaped sand collection floor (4) laid at the bottom of the outer cabin (101) and a sand collection box (401) installed at the lowest point of the funnel-shaped sand collection floor (4). The sand collection box (401) is detachable.

10. The self-powered double-layer micro-positive pressure sand-proof and heat-insulating container as described in claim 1, characterized in that: The temperature-controlled dehumidification system includes a PTC heating plate (7), a temperature sensor (701), and a dehumidifier (702) fixed in the inner chamber (102). The temperature sensor (701) is electrically connected to the PTC heating plate (7), and the dehumidifier (702) has a built-in humidity detection module.

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