A general type of heat preservation and fresh-keeping, anti-corrosion and oxidation, anti-freezing and cold isolation, nitrogen cavity protection system

Abstract

The application discloses a universal heat preservation and fresh-keeping, anti-corrosion and oxidation, anti-freezing and cold isolation, nitrogen cavity protection system, which comprises a single-layer or double-layer inner cavity inner container heat insulation cavity, a gas path assembly, an external flexible gas source capsule and an optional intelligent sensing module. The cavity is a closed and sealed inner cavity structure, can be filled with 95%-99.99% micro-positive pressure nitrogen or a small amount of liquid nitrogen, and is suitable for a wide temperature environment of-45 DEG C to 95 DEG C. The system is matched with a gas filling nozzle and a colloidal air pressure plug with a selectable one-way air inlet function, and a detachable dustproof and air leakage prevention cover can be arranged on the outside of the micro-porous hole. The sealing plug assembly is provided with an independent sealing rubber ring, and external air is isolated after being closed. The external flexible capsule is a selected structure, can balance the pressure in the cavity, and can intuitively judge whether the cavity leaks or not by relying on the shape. The system divides the nitrogen filling area into single-layer cavity and double-layer inner cavity inner container two types, and is suitable for multiple scene use. The optional temperature and pressure and air tightness sensors are wirelessly connected with a mobile phone for remote monitoring. The system can realize multiple nitrogen protection, supports repeated nitrogen supplement and maintenance in the later period, has strong universality and is convenient to maintain.

Description

Technical Field

[0001] A search of existing products and related patents reveals that nitrogen protection solutions have been applied in multiple independent fields. Most existing similar products simply evacuate the internal storage cavity or directly fill it with nitrogen, relying on external nitrogen generators to complete gas replacement and then sealing it once. This approach only slows down food oxidation and spoilage by reducing the oxygen concentration within the cavity. Such solutions lack an independent interlayer cavity, cannot simultaneously achieve heat preservation and anti-freezing / cold insulation effects, and do not support subsequent nitrogen replenishment maintenance.

[0002] Traditional insulated containers mostly use a vacuum sandwich structure. The few existing designs that fill the sandwich with nitrogen only focus on thermal insulation performance and cannot simultaneously provide corrosion and oxidation protection for the contents. They also do not have a pressure plug that can be added or omitted as needed.

[0003] Existing nitrogen protection solutions in the field of cultural relic collections are mostly independent display cases and protective covers. These solutions fill the inner cavity with nitrogen to remove oxygen for collections such as calligraphy and paintings, woodenware, lacquerware, and ceramics. However, they lack heat insulation layer structures, making them difficult to adapt to high and low temperature environments. They also lack auxiliary structures that can visually identify leaks.

[0004] Existing protection solutions for ornamental fish tanks and aquaculture ponds in the aquaculture industry only involve simple gas replacement of the water body and do not have a suitable nitrogen insulation cavity structure, which cannot simultaneously meet the needs of heat preservation and internal cavity anti-oxidation protection.

[0005] Most thermal insulation products such as doors, windows, and curtains adopt a hollow air-filled structure, and their internal filling medium is mostly air or argon. They do not use nitrogen as a protective medium and do not have a supporting structure for later nitrogen replenishment and visual leak detection.

[0006] Nitrogen protection in the field of hydroelectric and electrical instruments only fills the cavity inside the component housing with nitrogen to prevent moisture and slow down metal oxidation. There is no double-layered nitrogen cavity that is compatible with single-layer or double-layer structures, and it cannot be adapted to use in food storage, cultural relic collection, aquaculture, door and window insulation and other applications.

[0007] The existing technologies mentioned above have fragmented application scenarios and cannot form a universal protection architecture; various products have single functions and cannot simultaneously achieve multiple protection effects such as heat preservation, freshness preservation, corrosion prevention, oxidation resistance, and antifreeze insulation. Moreover, most of them are one-time sealing structures, lack colloidal gas pressure plugs that can be replenished with nitrogen later, and do not have external flexible gas source capsules to achieve passive visual leak detection. Overall, their versatility and maintainability are poor. Summary of the Invention

[0008] (I) Implementation Section of Laminated Glass for Water and Electricity Meters Existing water and electricity meter observation windows lack a nitrogen protection structure suitable for this solution. This invention provides a double-layered laminated glass assembly suitable for water and electricity meter observation windows. The double-layered laminated glass forms a sealed cavity. The cavity can be pre-filled with slightly positive pressure nitrogen gas of 95%–99.99% purity before leaving the factory, with the positive pressure range inside the cavity relative to standard atmospheric pressure being 0.02MPa–0.15MPa. Alternatively, a small amount of liquid nitrogen can be added to the cavity; after vaporization, the liquid nitrogen forms a stable slightly positive pressure environment. Standardized assembly openings are pre-reserved at the edges of the double-layered laminated glass.

[0009] A colloidal air pressure plug is installed at the assembly opening. This plug can be optionally configured with a one-way air inlet micro-hole structure with an inflation nozzle, or the one-way air inlet structure can be omitted, allowing for flexible assembly. A dustproof and leak-proof cover can be detachably installed on the outside of the air inlet micro-hole; when not in use, it can be locked to prevent dust, water, and leaks. The air pressure plug has a press-type or threaded locking external interface, which can be used to install an external flexible air source capsule.

[0010] The external flexible gas source capsule is an optional assembly component, and its size can be freely adjusted according to the on-site operating conditions. The flexible capsule can dynamically balance the nitrogen pressure inside the interlayer, offsetting the expansion and contraction fluctuations of the cavity caused by alternating hot and cold environments. Simultaneously, the sealing status can be visually judged by its own shape: a full capsule indicates sufficient nitrogen in the interlayer and a good seal; a flattened or collapsed capsule indicates a leak in the cavity, allowing users to promptly locate the leak and replenish nitrogen using a colloidal gas plug. The entire structure can operate stably in extreme temperature environments ranging from -45℃ to 95℃.

[0011] During assembly, double-layered laminated glass is bonded and fixed to the outside of the original observation glass of the water meter and electricity meter; nitrogen in the interlayer isolates the outside high temperature and extreme cold, achieving heat preservation, antifreeze and cold insulation protection, preventing the water inside the water meter from freezing and cracking the glass, while blocking the temperature difference between inside and outside and eliminating condensation on the observation window of the electricity meter; if a small amount of nitrogen leaks from the interlayer, nitrogen can be replenished through an external flexible gas source capsule or an inflation structure to continuously maintain the protective performance.

[0012] (II) Detailed description of the structure of the container body, sealing cap, and pressure plug The container body can be equipped with a single or double-layered inner cavity and heat-insulating chamber, and is divided into two main areas: a side-wall heat-insulating interlayer and an inner cavity or liner that independently contains materials. The side-wall interlayer is filled with nitrogen to achieve all-round heat insulation protection. The bottle cap, bottle stopper, and large food box lid are independent and detachable components, each equipped with an independent sealing ring and sealing sleeve. After the sealing structure is closed, it completely isolates the inner cavity and liner of the container from the outside air. The sealing ring and sleeve are not filled with nitrogen, but only serve an airtight isolation function.

[0013] Independent colloidal pressure plugs can be added to the sides of the bottle cap and stopper. The colloidal pressure plugs can be selectively configured with a one-way air intake microporous structure, or they can be without a one-way air intake structure. The assembly method is adjustable. The pressure plugs can selectively connect to the single-layer or double-layer inner cavity heat insulation cavity, or connect to the inner cavity and inner liner of the container, and add nitrogen or a small amount of liquid nitrogen through the inflation structure.

[0014] The inner cavity and liner of rigid insulation, food storage, and beverage products can be filled with nitrogen as needed, or left empty without nitrogen filling, and are equipped with corresponding colloidal gas pressure stoppers; the rigid insulation, food storage, and beverage products include standard wine bottles, thermos flasks, thermos flask liners, thermos buckets, household cups and mugs, baby bottles, PC mineral water bottles, aluminum cans, aluminum cans, PET plastic bottles, wine storage jars, milk powder storage containers, food insulated boxes, and puffed food packaging bags. For daily drinking water and beverage containers, only the side wall interlayer is filled with nitrogen; the inner cavity and liner do not need to be filled with nitrogen.

[0015] The external interface of the colloidal gas plug can be matched with a detachable puncture-type inflation needle. The inflation needle is equipped with a limiting puncture structure and a built-in one-way check structure. It is designed for ordinary home users, and gas can be replenished manually without disassembling the heat insulation cavity. The limiting puncture structure restricts the puncture depth and prevents a large amount of nitrogen from being ejected from the capsule at one time during home operation, thus improving the safety of civilian use.

[0016] After assembly, the container's sidewall interlayer forms a surrounding protective layer with nitrogen, leaving only the bottle mouth and lid sealing ring areas unfilled with nitrogen. The entire system can operate stably for extended periods in high and low temperature environments ranging from -45℃ to 95℃. If a minor leak occurs in the interlayer or inner cavity, nitrogen can be replenished at any time using a colloidal pressure plug, eliminating the need for complete container replacement and allowing for repeated maintenance and use over a long period.

[0017] (III) Multi-category adaptation and expansion implementation method This system can be preferentially applied to rigid insulation and food storage / drinking products, including standard wine bottles, thermos flasks, thermos flask liners, insulated buckets, household cups and jars, baby bottles, PC mineral water bottles, aluminum cans, aluminum cans, PET plastic bottles, wine jars, milk powder storage containers, food insulated boxes, and puffed food packaging bags; the above-mentioned rigid products are equipped with push-button bottle caps, threaded locking bottle caps, nitrogen wine stoppers, thermos flask stoppers, and food box lids; the inner cavity and liner of the food containers can be filled with nitrogen or not as needed, and are matched with corresponding colloidal pressure stoppers.

[0018] The single-layer and double-layer inner cavity insulation cavities can also be extended to flexible home products, light-transmitting curtains, doors and windows, door curtains, and civilian protective equipment, including thermal pads, constant temperature sleeping mats, constant temperature sleeping covers, pet breeding boxes, transparent thermal insulation curtains, and double-layer laminated glass suitable for water meters and electricity meters; this system can also be adapted to protective covers for antiques, ancient calligraphy and paintings, wooden lacquerware, and ceramic collections. The protective covers are divided into single-layer glass structures and double-layer laminated glass structures. The inner cavity and inner liner of the protective cover can be filled with nitrogen; it can also be adapted to ornamental fish tanks and aquaculture ponds. For ornamental fish tanks, only the outer wall double-layer laminated with nitrogen is filled, and nitrogen is prohibited from being filled into the water-containing cavity.

[0019] The protective cover can be optionally equipped with an external flexible pressure-stabilizing airbag, or it can be equipped with built-in temperature sensors, pressure sensors, and airtightness sensors. The sensors are wirelessly connected to a mobile terminal, allowing users to remotely view the temperature, nitrogen pressure, and airtightness leakage status inside the cavity in real time, thus achieving intelligent monitoring.

[0020] This system is compatible with ornamental fish tanks, pet constant temperature breeding nests, and aquaculture ponds. Only the outer double-layer heat insulation interlayer of the fish tank or pond is filled with nitrogen. The nitrogen in the interlayer buffers the environmental temperature difference, inhibits condensation on the tank wall, and stabilizes the external environmental temperature. The water-containing cavity is not filled with nitrogen for protection.

[0021] For food-grade insulated boxes and cold chain refrigerators, the side walls of the box are double-layered and filled with nitrogen. The box lid uses the same sealing and gas-replenishing structure as the bottle cap and stopper of this invention. The lid is equipped with an independent sealing ring and a colloidal gas pressure plug. The inner cavity and inner liner of the box can be selectively filled with nitrogen or left empty without nitrogen filling. The nitrogen in the interlayer can achieve long-term heat preservation, freshness preservation, anti-corrosion and anti-oxidation of food, and inhibit food oxidation, deterioration, fermentation and mold growth.

[0022] Fish tanks, food cabinets, and cultural relic protection covers can all be equipped with flexible air source capsules and intelligent sensing monitoring modules, making them suitable for long-term stable use in multiple scenarios.

[0023] (iv) Comprehensive effects of heat preservation, preservation, anti-corrosion and anti-oxidation, and anti-freezing and cold insulation in all scenarios This invention provides single-layer and double-layer inner cavity insulation chambers, independent material storage chambers, or inner liner chambers that can be filled with slightly positive pressure nitrogen. Nitrogen possesses excellent heat insulation, antifreeze, and cold insulation properties, as well as inert preservation, anti-corrosion, and anti-oxidation characteristics, making it suitable for various general scenarios to achieve precise protection. Nitrogen is chemically stable and will not react chemically with glass, metal, rubber, PC plastic, wood, organic matter from antique calligraphy and paintings, or various food materials, making it compatible with a wide range of materials. Nitrogen has a low thermal conductivity, which can both prevent external high temperatures from being conducted inward to achieve heat insulation and prevent internal heat from being lost outward, resulting in significant antifreeze and cold insulation effects. Relying on the inertness of nitrogen to reduce the probability of oxygen contact, it can achieve long-term anti-corrosion and anti-oxidation. In hard food storage scenarios, nitrogen can be filled into the inner liner and inner cavity to delay fermentation and spoilage of materials and extend shelf life, or nitrogen filling can be omitted, offering flexible usage options.

[0024] The system can inject a small amount of liquid nitrogen into the interlayer. After the liquid nitrogen vaporizes, it can autonomously regulate the internal temperature of the interlayer and simultaneously replenish the gas pressure inside the cavity, maintaining a stable micro-positive pressure state. Compared with the shortcomings of traditional vacuum interlayers that lack a buffer medium and only have a single thermal insulation function, nitrogen and vaporized liquid nitrogen can form a stable micro-positive pressure buffer layer, which is suitable for operating conditions in the entire temperature range of -45℃ to 95℃. It effectively buffers drastic temperature differences in the environment and avoids direct damage to the container body, instrument housing, cultural relic protective covers, food boxes, doors and windows from extreme temperatures.

[0025] When used in standard wine bottles, thermos flasks, thermos flask liners, insulated containers, household cups and mugs, baby bottles, PC mineral water bottles, and other rigid drinking containers, only the side wall interlayer is filled with nitrogen, while the inner cavity and liner can be filled with nitrogen as needed. It comes with a gel pressure stopper for long-lasting heat retention. When used in wine storage jars, milk powder storage tanks, aluminum cans, and food insulated boxes, the side wall interlayer is filled with nitrogen for heat insulation and temperature control, while the inner cavity and liner are filled with nitrogen as needed for preservation and corrosion prevention. When used in thermal pads, temperature-controlled sleeping mats, temperature-controlled sleeping covers, doors, windows, curtains, and transparent thermal insulation curtains, the double-layered nitrogen filling isolates indoor and outdoor heat exchange, stabilizing the indoor environment. When used in pet temperature-controlled breeding nests, ornamental fish tanks, and aquaculture ponds, only the outer wall interlayer is filled with nitrogen to stabilize the temperature; when used in outdoor water meters and electricity meters with double-layered glass, the interlayer nitrogen is adapted to a wide range of operating conditions, suppressing condensation on the meter window, preventing the glass from freezing and cracking, and ensuring stable operation of the instrument; when used as protective covers for antiques, ancient calligraphy and paintings, wooden lacquerware, and ceramic collections, the inner cavity of the protective cover is filled with nitrogen, providing long-lasting corrosion resistance, oxidation resistance, mildew resistance, and fading resistance, delaying the aging and damage of the collections.

[0026] The entire system relies on a single-layer or double-layer inner cavity sealed protective structure, which is not limited by materials or size. It comprehensively covers all fields such as home, outdoor instruments, food storage, cultural relics collection, aquaculture, and door and window insulation. It has comprehensive protective functions and can be maintained and reused for a long time.

[0027] (v) Description of External Flexible Gas Source Capsule The external flexible air source capsule is a universal optional component for all categories of this invention, which can be assembled or omitted according to usage requirements; the capsule volume is not limited and can be flexibly matched according to the container, protective cover, instrument interlayer volume, ambient temperature and working conditions to adapt to various specifications of equipment.

[0028] The flexible gas source capsule has two core functions: First, it dynamically balances the nitrogen pressure inside the single-layer and double-layer inner liner insulation cavity and the inner cavity of the artifact protection cover, offsetting the thermal expansion and contraction of the gas caused by temperature changes, and preventing the cavity from deforming under pressure, the interface from loosening, and slow leakage; Second, it achieves passive visual leak detection based on its own shape: a full and plump capsule indicates sufficient internal nitrogen, good sealing, and normal protection; a flat and collapsed capsule indicates a leak in the cavity. Users can visually identify the fault, promptly locate the leak, and repair it by adding gas through a colloidal pressure plug.

[0029] Flexible gas source capsules require no external power supply or auxiliary intelligent equipment, can work stably without power for many years, and have a simple structure, low failure rate, and convenient maintenance.

[0030] (vi) Optional intelligent sensing module This system can be optionally configured with an intelligent sensing and interconnection module, which integrates temperature sensors, pressure sensors, and airtight space sensors, and can also be connected to external temperature control and adjustment components. The sensing module establishes communication with a mobile terminal wirelessly, allowing users to view the cavity, internal nitrogen pressure, real-time temperature, and airtightness leakage status in real time, and to store temperature and pressure fluctuation data for a long time.

[0031] The intelligent sensing module can be used in conjunction with an external flexible airbag to form a dual protection system of "mechanical visual leak detection + digital remote intelligent monitoring", which is suitable for high-requirement scenarios such as high-precision cultural relic collection, high-end food storage, and precision instrument protection. Attached Figure Description

[0032] Figure 1: Schematic diagram of the overall system structure Reference numerals: 1 - Single / double layer inner liner insulation cavity, 2 - Colloidal air pressure plug, 3 - Air inlet micropore, 4 - Dustproof and leak-proof cover, 5 - Sealing ring, 6 - External flexible air source capsule, 7 - Inflation needle. 8 - Two independent spaces within the cavity.

[0033] The purpose of the attached diagram is to demonstrate the complete assembly relationship of the general container body, the sealing and gas-replenishing components, and the flexible gas source capsule, and to clearly distinguish between the two independent spaces: the side wall insulation interlayer and the material-containing inner cavity.

[0034] Figure 2: Schematic diagram of the cross-section of double-layered laminated glass for water and electricity instruments Reference numerals: 1 - glass cavity, 2 - colloidal gas plug, 3 - external flexible gas source capsule, 4 - double-layered sandwich glass cavity.

[0035] The purpose of the attached diagram is to show the cross-sectional structure of the protective interlayer of water meters and electricity meters, and to demonstrate the nitrogen-filled structure of the interlayer and the assembly form of the outer pressure-stabilizing capsule.

[0036] Figure 3: Cross-sectional schematic diagram of the double-layer protective cover for antiques and paintings Reference numerals: 1 - outer interlayer cavity, 2 - inner cavity for containing the collection, 3 - colloidal gas plug, 4 - external flexible gas source capsule, 5 - intelligent sensing module.

[0037] The purpose of the attached diagram is to distinguish the interlayer of the protective cover for cultural relics and the double nitrogen-filled area inside the collection, and to indicate the assembly location of the intelligent sensing module. Supplementary Explanation

[0038] This specification includes three accompanying drawings, which are only simplified structural diagrams and do not limit the size, proportion, shape, or material of the invention. The relative positions of the components in the drawings are only used to clearly illustrate the technical solution of the invention. In actual implementation, the cavity size, assembly position, and external shape can be flexibly adjusted according to the working conditions. Technical features

[0039] The core technical features of this invention are summarized as follows: This invention discloses a universal nitrogen cavity protection system, which can achieve multiple protection effects such as heat preservation, freshness preservation, corrosion prevention and oxidation resistance, and freeze protection; the system can be configured with single-layer or double-layer inner liner heat insulation cavity, and the cavity is reserved with standardized assembly openings; the supporting gas circuit components include a colloidal gas pressure plug and an air inlet micro-hole, the air inlet micro-hole can be added or omitted as needed with a one-way air inlet structure, and the colloidal gas pressure plug has an external interface that can connect to an external flexible gas source capsule; the cavity can be filled with micro-positive pressure nitrogen with a purity of 95% to 99.99%, or a small amount of liquid nitrogen can be added. After the liquid nitrogen vaporizes, it forms a stable micro-positive pressure environment, which is suitable for a wide temperature range of -45℃ to 95℃, and supports factory pre-filling of nitrogen or subsequent nitrogen replenishment through an external structure; the external flexible gas source capsule can balance the internal gas pressure of the cavity and achieve passive visual leak detection by relying on its own shape.

[0040] This system can be selectively equipped with various sealing plug components and wireless intelligent sensing modules, and is compatible with a wide range of items such as hard food containers, baby bottles, insulated buckets, PC mineral water bottles, door and window curtains, ornamental fish ponds, antique protective covers, and laminated glass for water and electricity meters. The cavity can be selectively filled with nitrogen only in the interlayer or with nitrogen simultaneously in the inner cavity and liner. This invention solves the shortcomings of existing nitrogen protection equipment, such as fragmented application scenarios, single function, and lack of post-maintenance. It is highly versatile and has a wide range of applications.

Claims

1. A universal heat preservation, preservation, anti-corrosion, anti-freezing, cold insulation, and nitrogen chamber protection system, characterized in that, The system includes single-layer and double-layer inner liner insulation chambers, gas path components, and an external flexible gas source capsule. The single-layer and double-layer inner liner insulation chambers eliminate the exposed heat-fused conical sealing structure, and the chambers have pre-reserved standardized assembly openings. The gas path components are assembled at the assembly openings and include a colloidal gas pressure plug and an inlet micro-hole. The inlet micro-hole can be configured with a unidirectional air intake structure, or the unidirectional air intake structure can be omitted, allowing for flexible adjustment. An external interface is provided on the outside of the colloidal gas pressure plug, and the external flexible gas source capsule communicates with this external interface. The single-layer and double-layer inner liner insulation chambers can be filled with micro-positive pressure nitrogen, or a small amount of liquid nitrogen can be added and vaporized to create a micro-positive pressure environment. The nitrogen purity is 95%–99.99%, and the micro-positive pressure is not limited to exceeding standard atmospheric pressure. The entire system is compatible with temperatures ranging from -45℃ to 95℃. Stable operation across a wide range of high and low temperature environments; this system abandons the industry-standard one-time permanent sealing structure and is not limited to factory pre-filled nitrogen sealing. It can continuously replenish nitrogen to the single-layer or double-layer inner cavity insulation chamber through the combination of built-in colloidal gas pressure plug and external flexible gas source capsule, maintaining a stable micro-positive pressure in the chamber for a long time, ensuring long-term protection performance of heat preservation, freshness preservation, corrosion prevention, oxidation resistance, and freeze-proof and cold-insulating properties; this system can also be equipped with matching sealing plug components, which are selected from at least one of the following devices: press-type thermos bottle stopper, wine bottle nitrogen stopper, press-type bottle cap, threaded locking bottle cap, food box cap, including water meter glass colloidal gas pressure plug cap, and electricity meter glass colloidal gas pressure plug. The internal cavity of the single-layer or double-layer laminated glass cap on the surface of the device is equipped with a colloidal gas pressure plug, and the glass cap has a reserved nitrogen filling port. The cavity is used to store nitrogen. The sealing plug assembly is equipped with a sealing ring that only isolates external air and is not filled with nitrogen. The colloidal pressure plug can selectively connect to the single-layer or double-layer inner cavity insulation cavity or the inner cavity and liner of the container, and can deliver nitrogen to the corresponding space. The external interface can be matched with a detachable puncture-type inflation needle. The puncture-type inflation needle is equipped with a limiting puncture structure and a built-in one-way check structure. In home scenarios, it can be manually connected to the external flexible gas source capsule to complete online gas replenishment without disassembling the cavity. The limiting puncture structure restricts the puncture depth to avoid excessive depressurization during operation by ordinary users.

2. As described in claim 1, the external interface is a press-type fast charging interface or a threaded locking and sealing interface; a removable dustproof and leak-proof cover can be provided on the outside of the air inlet micro-hole.

3. As described in claim 1, the external flexible gas source capsule is an optional assembly structure, and the capsule volume can be flexibly adjusted according to the working conditions; the flexible gas source capsule is used to balance the air pressure inside the single-layer or double-layer inner cavity heat insulation cavity or the inner cavity, and at the same time, it can visually determine whether there is nitrogen leakage in the cavity by relying on the external appearance, without the need for an external power supply and can work passively all year round.

4. As described in claim 1, the single-layer or double-layer inner cavity heat insulation cavity material is selected from any one of glass, metal, rubber, flexible light-transmitting material, fabric composite material, and PC plastic; the material is suitable for stable use in a wide temperature range of -45℃ to 95℃.

5. As described in claim 1, the single-layer or double-layer inner cavity heat insulation cavity can be divided into multiple groups of small air chambers, and flow-limiting communication holes are provided between adjacent small air chambers.

6. As described in claim 1, an intelligent sensing module may also be optionally provided, the intelligent sensing module including a temperature sensor, a pressure sensor, and an airtightness sensor, the sensing module being wirelessly connected to a mobile terminal to remotely view the cavity's operating parameters and leakage status.

7. As described in claim 1, the single-layer or double-layer inner cavity insulation body can be preferentially applied to rigid insulation and food storage and beverage products, including standard wine bottles, thermos bottles, thermos bottle liners, thermos buckets, household cups and jars, baby bottles, PC mineral water bottles, aluminum cans, aluminum cans, PET plastic bottles, wine jars, milk powder storage tanks, food insulation boxes, and puffed food packaging bags; the rigid products are equipped with press-type bottle caps, threaded locking bottle caps, nitrogen wine stoppers, thermos bottle stoppers, and food box lids; the inner cavity and inner liner of the food container can be filled with nitrogen or not filled with nitrogen as needed, and are equipped with corresponding colloidal pressure stoppers.

8. As described in claim 1, characterized in that, The single-layer and double-layer inner cavity insulation cavities described herein can be applied to flexible home products, light-transmitting curtains, doors and windows, door curtains, and civilian protective equipment, including thermal pads, constant temperature sleeping mats and covers, pet terrariums, transparent thermal insulation curtains, double-layer laminated glass for water meters and electricity meters; single-layer and double-layer laminated inner cavity glass for water meters and electricity meters; this system is also suitable for protective covers for antiques, ancient paintings and calligraphy, wooden and lacquerware, and old ceramic objects. The protective covers are divided into single-layer glass structures and double-layer laminated glass inner cavity structures. The inner cavity and inner liner of the protective cover can be filled with nitrogen; it can also be used with ornamental fish tanks and aquaculture ponds; only the outer wall of the ornamental fish tank is filled with nitrogen in a double-layer laminated structure, and nitrogen must not be filled into the inner cavity containing the water.

9. As described in claim 1, through searching relevant existing patents and market products, it is known that existing nitrogen protection equipment for antiques, ancient paintings and calligraphy, woodenware, lacquerware, ceramics, and other old objects generally relies on large nitrogen generators, constant humidity rooms, and electrical control equipment, resulting in high overall costs, large size, and impracticality for civilian use; most equipment simply evacuates the inner cavity of the artifact storage or directly inputs nitrogen, without a double-layered inner cavity option, without a visual pressure balance leak detection structure, and cannot be adapted to multiple scenarios. There is currently no reasonable nitrogen protection solution for aquariums, and the industry lacks a dedicated solution for outer wall double-layer protection. Commercially available food insulation boxes and cold chain boxes rely solely on foam or vacuum insulation, with no suitable gas-filling sealing structure for the lid, making selective nitrogen filling for preservation impossible, and offering only a single protective function; the air inlet micro-hole can adopt various equivalent air filling structures, and can be configured with a unidirectional air inlet structure or without, adapting to different nitrogen filling and sealing requirements.

10. A general-purpose nitrogen cavity protection system for heat preservation, food preservation, corrosion prevention, oxidation resistance, and freeze protection according to any one of claims 1 to 9, characterized in that: This system is applicable to a wide range of products, not limited to those listed in claims 7 and 8. It is suitable for all containers, utensils, vessels, bottles, protective covers, doors, curtains, and sealing caps requiring insulation, preservation, corrosion resistance, oxidation prevention, and cold insulation. The cavity can be a single-layer or double-layer inner liner, capable of being filled with nitrogen and continuously replenished later. In practical implementation, the cavity size, assembly position, and internal and external structural design can be flexibly adjusted according to the operating conditions. All technical implementations employing the inflation structure, pressure balance structure, visual leakage detection structure, and intelligent sensor monitoring scheme of this application are within the scope of protection of this invention.

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