Finished grain nitrogen filling insect prevention air pressure equalization and compensation system

Abstract

The utility model discloses a finished product grain nitrogen filling insect prevention air pressure balance and compensation system belongs to grain storage technical field, it includes: be used to seal grain heap's sealing tent, be used to absorb nitrogen -rich gas and carry out the nitrogen -making machine of purification and set up on the pipeline steady voltage subassembly between nitrogen -making machine and sealing tent, the both ends of nitrogen -making machine are communicated with sealing tent through the pipeline, the steady voltage subassembly includes the encapsulation cavity, elastic part and set up in the plugging piece of encapsulation cavity, and the both ends of elastic part are connected with encapsulation cavity and plugging piece respectively, the inner wall between plugging piece and encapsulation cavity forms the airflow passageway, and the airflow passageway can control the degree of one -way conduction under the pressure effect. The utility model can effectively maintain the air pressure balance in tent, and protect sealing tent from being damaged.

Description

Technical Field

[0001] This utility model relates to the field of grain storage technology, and in particular to a nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grain. Background Technology

[0002] Nitrogen-filled modified atmosphere technology for bagged finished grain based on sealed tents is an important development direction in the field of green grain storage in China. Its core objective is to create a low-oxygen / oxygen-free environment through sealed tents, combined with nitrogen-filled modified atmosphere technology to inhibit the growth of pests and molds and the respiration of grain.

[0003] The invention disclosed in CN221784722U is an automatic controlled atmosphere device for multiple rice piles connected in series, belonging to the field of nitrogen controlled atmosphere technology for grain storage. It includes: a nitrogen inlet pipe, a rice pile airbag assembly, a corrugated pipe, a forced exhaust fan, and an exhaust pipe. Multiple rice pile airbag assemblies are evenly arranged in the storage room. Each airbag assembly includes multiple rice pile airbags. The nitrogen inlet pipe is connected to the inlet of the first rice pile airbag. The multiple rice pile airbags are connected in series via the corrugated pipe. The forced exhaust fan is installed on the passage of each section of the corrugated pipe and at the exhaust port of the last rice pile airbag. The exhaust pipe is connected to the forced exhaust fan connected to the last rice pile airbag. This solution improves the working efficiency of the nitrogen-filled controlled atmosphere mode, reduces the average nitrogen filling time, lowers operational risks, reduces controlled atmosphere energy consumption, and saves controlled atmosphere costs.

[0004] The existing automatic controlled atmosphere device has a fixed range of movement for its airbag assembly, which does not adapt to changes in the volume of bagged stacks (such as excessive compression of airbags due to expansion of grain piles in summer), affecting the effect of air pressure equalization. At the same time, the pressure control accuracy of traditional positive pressure forced exhaust fans is difficult to meet the requirements of the tent pressure range (10-15Pa), and in actual operation, the grain surface film will still be damaged due to excessive pressure fluctuations. Utility Model Content

[0005] In view of this, it is necessary to provide a nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grains to solve the problem that the existing automatic atmosphere control devices have limited adjustment range and are prone to film damage.

[0006] This invention provides a nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grain. include: Sealing tents, used to seal grain piles; A nitrogen generator is used to absorb nitrogen-rich gas and purify nitrogen. The two ends of the nitrogen generator are connected to the sealed tent through pipes. A pressure stabilizing component is installed on the pipeline between the nitrogen generator and the sealed tent. The pressure stabilizing component includes a sealing cavity, an elastic element, and a sealing element disposed in the sealing cavity. The two ends of the elastic element are respectively connected to the sealing cavity and the sealing element. An airflow passage is formed between the sealing element and the inner wall of the sealing cavity. The airflow passage can be controlled to unidirectionally conduct under pressure to balance the internal air pressure of the sealed tent.

[0007] Furthermore, the encapsulation cavity is provided with a conical cavity adapted to the sealing member, the constriction of the conical cavity is integrated with the opening of the encapsulation cavity, and the sealing member can seal the conical cavity.

[0008] Furthermore, the two conical cavities are symmetrically arranged at both ends of the encapsulation cavity to form a double conical chamber structure; the shape and size of the openings at both ends of the encapsulation cavity are consistent.

[0009] Furthermore, the sealing element is a sealing baffle.

[0010] Furthermore, the sealing baffle is frustum-shaped, and an annular airflow passage is formed between the sealing baffle and the inner wall of the encapsulation cavity.

[0011] Furthermore, it also includes a pipeline assembly, which includes a nitrogen filling pipe and a return pipe. The input end of the sealed tent is connected to the nitrogen generator through the nitrogen filling pipe, and the output end of the sealed tent is connected to the nitrogen generator through the return pipe. The pressure stabilizing component is respectively installed on the nitrogen filling pipe and the return pipe, and the pressure stabilizing component can be opened unidirectionally along the airflow direction.

[0012] Furthermore, the sealed tent is provided in multiple ways, and the multiple pipeline components and voltage stabilizing components are provided in conjunction with the sealed tent.

[0013] Furthermore, the sealed tent is hexagonal, and its two sides are provided with ports for connecting to the nitrogen filling pipe and the return pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model discloses a nitrogen-filled insect-proof air pressure equalization and compensation system for finished grain. It includes a pressure stabilizing assembly comprising a sealing cavity, an elastic element, and a sealing element disposed within the sealing cavity. The two ends of the elastic element are connected to the sealing cavity and the sealing element, respectively. The sealing element can move relative to the elastic element under the combined action of the airflow pressure. An airflow passage is formed between the sealing element and the inner wall of the sealing cavity. The airflow can push the sealing element to overcome the resistance of the elastic element, controlling the unidirectional flow of the airflow passage. This allows the sealed tent to unidirectionally fill with nitrogen and / or unidirectionally exhaust air according to its own air pressure changes. The dynamic cooperation between the elastic element and the sealing element achieves adaptive pressure compensation, reduces reliance on electronic control systems, improves system reliability, ensures nitrogen filling efficiency and pressure stability, and maintains a continuously low-oxygen environment within the tent. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 is a schematic diagram of the overall structure of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the voltage regulator component in this utility model. Figure 1 ; Figure 3 This is a schematic diagram of the voltage regulator component in this utility model. Figure 2 ; Figure 4 This is a schematic diagram of the overall structure of the present invention. Figure 2 .

[0016] In the image, 100 represents a sealed tent; 200. Nitrogen generator; 300. Voltage regulator assembly; 310. Encapsulation cavity; 311. Conical cavity; 320. Elastic element; 330. Sealing element; 400. Pipeline components; 410. Nitrogen filling pipe; 420. Return pipe. Detailed Implementation

[0017] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0018] This embodiment of a nitrogen-filled insect-proof air pressure equalization and compensation system for finished grain relates to the field of grain storage technology. Through the cooperation of the elastic element 320 and the sealing element 330 in the pressure stabilizing component 300, a unidirectional airflow path is formed. Combined with the connection structure between the nitrogen generator 200 and the sealed tent 100, the pressure of nitrogen filling and exhaust can be adaptively adjusted, effectively maintaining the air pressure balance inside the tent, reducing pressure fluctuations caused by the expansion or contraction of the grain pile, and has the advantages of improving the stability of air pressure balance, reducing the risk of damage to the sealed tent 100, and adapting to the volume fluctuations of the grain pile.

[0019] Please see Figures 1 to 4 This embodiment of a nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grain includes a sealing tent 100 for sealing the grain pile, a nitrogen generator 200 for absorbing nitrogen-rich gas and purifying the nitrogen, and a pressure stabilizing component 300 installed on the pipeline between the nitrogen generator 200 and the sealing tent 100. The nitrogen generator 200 is connected to the sealing tent 100 at both ends via pipelines. The nitrogen generator 200 can absorb nitrogen-rich gas located in the sealing tent 100, separate and purify the nitrogen in the nitrogen-rich gas, and reintroduce the nitrogen into the sealing tent 100. This allows for the reuse of the nitrogen-rich gas and also reduces the power consumption of the nitrogen generator 200, saving energy.

[0020] The pressure stabilizing component 300 includes a sealing cavity 310, an elastic element 320, and a sealing element 330 disposed in the sealing cavity 310. The two ends of the elastic element 320 are connected to the sealing cavity 310 and the sealing element 330, respectively. The sealing element 330 can move relative to the elastic element 320 under the combined action of the airflow pressure. An airflow passage is formed between the sealing element 330 and the inner wall of the sealing cavity 310. The airflow can push the sealing element 330 to overcome the resistance of the elastic element 320, controlling the unidirectional conduction of the airflow passage. This allows the sealed tent 100 to unidirectionally fill with nitrogen and / or unidirectionally exhaust air according to its own pressure changes. The dynamic cooperation between the elastic element 320 and the sealing element 330 achieves pressure adaptive compensation, reduces dependence on the electronic control system, improves system reliability, ensures nitrogen filling efficiency and pressure stability, and maintains a continuously low-oxygen environment inside the tent.

[0021] During use, when the internal pressure of the sealed tent 100 is higher than the set high threshold, the gas pressure pushes the sealing element 330 located at the input end of the nitrogen generator 200 to compress the elastic element 320, and the airflow passage is opened to realize exhaust; after the pressure decreases, the elastic element 320 resets and the sealing element 330 closes the passage.

[0022] When the internal pressure of the sealed tent 100 is less than the set low threshold, the gas pressure pushes the sealing element 330 located at the output end of the nitrogen generator 200 to compress the elastic element 320, and the airflow passage is opened to realize nitrogen filling; after the pressure decreases, the elastic element 320 resets and the sealing element 330 closes the passage.

[0023] When the internal pressure of the sealed tent 100 is between a set high threshold and a low threshold, the sealing elements 330 of different pressure stabilizing components 300 maintain different degrees of opening. The gas pressure output from the nitrogen generator 200 overcomes the resistance of the sealing elements 330 and enters the sealed tent 100. The reverse pressure difference causes the sealing elements 330 to adhere tightly to the cavity wall, blocking gas backflow. Through the synergistic effect of at least two pressure stabilizing components 300, a dynamic balance of pressure inside and outside the tent is maintained. Traditional airbag systems rely on a fixed volume space to regulate pressure, which cannot adapt to volume changes caused by the expansion and contraction of the grain pile. This solution achieves adaptive pressure compensation through the dynamic cooperation of the elastic element 320 and the sealing element 330, avoiding the problem of airbag compression and deformation.

[0024] It should be noted that the nitrogen generator 200 uses the SG-30S "duplex nitrogen generator" provided by Wuhan Dongchang Storage Technology Co., Ltd., with a maximum nitrogen output of 30 Nm3 / h and a maximum output concentration of 99.8%. Sealed tent 100: Made of 0.1mm PA / PE nylon composite film welded together.

[0025] In some embodiments, please refer to Figure 2 The encapsulation cavity 310 is provided with a conical cavity 311 that is adapted to the sealing component 330. The constriction of the conical cavity 311 is integrated with the opening of the encapsulation cavity 310. The guiding structure of the conical cavity 311 ensures that the sealing component 330 always moves along the axis, avoiding sealing failure caused by lateral displacement.

[0026] In practical implementation, the conical cavity 311 is a cavity structure with a tapered, tapered cross-section. It can be made of metal or plastic, with the inner wall formed by injection molding or machining. The diameter of the constricted end of the conical cavity 311 is smaller than the diameter of the flared end. The constricted end and the opening of the encapsulating cavity 310 are continuously formed from the same material, specifically by welding, casting, or injection molding to connect the constricted end and the cavity opening into a single structure. The sealing component 330 is used to seal the conical cavity 311. It can be a conical plug made of rubber or silicone, with its outer diameter matching the inner diameter of the constricted end of the conical cavity 311. When the internal air pressure of the sealed tent 100 exceeds the preset value, the airflow pushes the sealing element 330 away from the constriction to form a gap, and the gas is discharged through the annular channel between the conical cavity 311 and the sealing element 330; when the air pressure decreases, the sealing element 330 is reset by the tension of the elastic element 320 and tightly fits the conical cavity 311 to achieve a seal.

[0027] In some embodiments, two conical cavities 311 are symmetrically arranged at both ends of the encapsulation cavity 310 to form a double conical cavity 311 chamber structure. The shape and size of the openings at both ends of the encapsulation cavity 310 are consistent. The bidirectional pressure regulation function is integrated through the symmetrical cavity structure, without the need for additional reverse valve group configuration. The symmetrical flow channel design makes the nitrogen supply and discharge process have an equivalent flow cross section, eliminating the hysteresis phenomenon in the pressure compensation process.

[0028] In practical implementation, the double-conical cavity 311 structure consists of two conical cavities 311 distributed symmetrically along an axis within the cavity body. This can be achieved through a single metal casting process, with the two conical cavities 311 having equal cone angles and coincident axes. This structure provides the pressure regulating unit with bidirectional symmetrical fluid channels, enabling it to simultaneously handle pressure fluctuations during both forward nitrogen charging and reverse gas return.

[0029] The through-hole diameters, edge chamfer angles, and surface roughness parameters at both ends of the conical cavity 311 are identical, which can be achieved through synchronous machining using a CNC machine tool. This corresponding structural design ensures symmetrical resistance characteristics experienced by the gas during bidirectional flow, preventing pressure compensation imbalances caused by structural differences.

[0030] When the volume of the grain pile expands, causing the pressure inside the sealed tent 100 to increase, the sealing baffle of the left conical cavity 311 of the encapsulation chamber 310 is pushed by the pressure to compress the elastic element 320, forming an annular airflow channel to discharge excess nitrogen. The airflow passing through the annular airflow channel can be compressed by the conical cavity 311 located at the other end. The symmetry of the double conical cavity 311 chamber structure ensures that the inlet and outlet airflows have the same response speed and flow characteristics, and the equal diameter design of the openings at both ends eliminates the difference in airflow directionality.

[0031] For further implementation methods, please refer to Figure 2 and Figure 3 The sealing element 330 is a sealing baffle. Through the cooperation between the rigid baffle and the conical cavity 311, the service life of the moving parts is extended while maintaining the same sealing performance. The sealing baffle can respond to pressure changes in a timely manner and establish a pressure relief channel to prevent the sealing curtain 100 from being damaged due to internal overpressure.

[0032] In practical implementation, the blocking baffle is a rigid structural component used to block or guide airflow. It can be made of metal or high-strength plastic in the form of a plate-shaped part, and its edge shape matches the constriction of the conical cavity 311. The conical cavity 311 is a cavity structure with a tapered cross section, and its constriction diameter can be set to form a clearance fit with the maximum outer diameter of the blocking baffle. When the internal pressure of the sealed tent 100 exceeds the set threshold, the airflow pushes the sealing baffle to compress the elastic element 320, so that an annular gap is formed between the baffle and the conical cavity 311. At this time, the airflow passage is opened to release the pressure. When the pressure returns to the normal range, the elastic element 320 pushes the sealing baffle to reset, completely fitting the conical cavity 311 to achieve a seal.

[0033] It should be further explained that the sealing baffle is frustum-shaped, forming an annular airflow passage between the sealing baffle and the inner wall of the encapsulation cavity 310. Under pressure, the frustum-shaped baffle undergoes axial symmetrical displacement, and the annular gap allows the gas to diffuse evenly in a 360-degree direction, avoiding pressure surges caused by localized airflow impacts. Furthermore, compared to a cylindrical structure, the tapered shape of the frustum-shaped structure allows for more precise alignment with the opening of the conical cavity 311 during the resetting process, improving sealing reliability.

[0034] In some embodiments, please refer to Figure 4 A nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grain also includes a pipeline component 400. The pipeline component 400 includes a nitrogen-filling pipe 410 and a return pipe 420. The input end of a sealed tent 100 is connected to a nitrogen generator 200 via the nitrogen-filling pipe 410, and the output end of the sealed tent 100 is connected to the nitrogen generator 200 via the return pipe 420. A pressure stabilizing component 300 is respectively installed on the nitrogen-filling pipe 410 and the return pipe 420, and the pressure stabilizing component 300 can be opened unidirectionally along the airflow direction. Through the independently installed nitrogen-filling pipe 410 and return pipe 420, in conjunction with the bidirectional pressure stabilizing component 300, pressure control can be performed separately during gas input and output. In practical implementation, the nitrogen filling pipe 410 is used to supply nitrogen gas into the sealed tent 100. It can be made of pressure-resistant metal or polymer material, with a diameter of, for example, 50-100 mm. The function of the nitrogen filling pipe 410 is to establish a positive gas delivery channel between the nitrogen generator 200 and the sealed tent 100. The return pipe 420 is used to return nitrogen-rich gas from the sealed tent 100 to the nitrogen generator 200. It can be implemented using a symmetrical structure made of the same material as the nitrogen filling pipe 410. The function of the return pipe 420 is to form a gas circulation loop, preventing unidirectional gas accumulation that could lead to pressure imbalance.

[0035] When the nitrogen generator 200 fills the sealed tent 100 with nitrogen, the pressure stabilizing component 300 on the filling pipe 410 opens under positive pressure, while the pressure stabilizing component 300 on the return pipe 420 remains closed due to the reverse pressure difference. When the internal pressure of the sealed tent 100 exceeds the threshold, the pressure stabilizing component 300 on the return pipe 420 opens under the reverse pressure difference, and the nitrogen-rich gas flows back to the nitrogen generator 200 for purification. This bidirectional adjustable gas path can automatically adjust the gas circulation volume according to changes in the grain pile volume. For example, when the grain pile expands in summer, the return pipe 420 promptly discharges excess gas to prevent excessive compression of the gas bags.

[0036] It should be noted that: Nitrogen filling pipe 410 and return pipe 420: both use commercially available De50PP corrugated hose, commercially available De160PVC-U pipe, stainless steel pipe, PPR pipe or PE pipe.

[0037] In some embodiments, multiple sealed tents 100 are provided, and multiple pipeline components 400 and pressure stabilizing components 300 are provided in conjunction with the sealed tents 100. Through multiple independent system partition control, precise compensation can be made for pressure changes in different sealed tents 100, adapting to large-scale grain storage environments.

[0038] Multiple sealed tents 100 can cover grain pile areas of different volumes or shapes, and each sealed tent 100 forms an independent gas circulation loop through a nitrogen filling pipe 410 and a return pipe 420 connected to it. A pressure stabilizing component 300 is installed on the corresponding nitrogen filling pipe 410 and return pipe 420, and independently adjusts the airflow direction and flow rate according to the pressure changes in each sealed tent 100.

[0039] As a further embodiment, the sealed tent 100 is hexagonal, with ports on both sides connecting to the nitrogen filling pipe 410 and the return pipe 420. The hexagonal structure, through its polygonal symmetry design, creates an adaptive deformation capability, avoiding the problem of stress overload in one direction. Compared to a single-sided centralized piping scheme, the independent port design on both sides optimizes the gas flow path and reduces the pressure fluctuation amplitude. In practical implementation, a hexagon is a polygonal structure with six sides and six vertices. It can be implemented using an equilateral hexagon or a symmetrical hexagon. This shape improves space utilization and creates a uniform stress distribution. The ports are tubular connection structures located on both sides of the sealed tent 100. They can be implemented using flange interfaces or quick-lock interfaces, and are used to establish gas transmission channels between the nitrogen filling pipe 410 and the return pipe 420. The hexagonal sealing tent 100, through its symmetrical geometric structure, can evenly distribute deformation stress when the grain pile expands or contracts, avoiding film tearing caused by localized stress concentration. The ports on both sides form directional connections with the nitrogen filling pipe 410 and the return pipe 420, respectively, separating the nitrogen input from the waste gas recovery path and reducing gas mixing interference. When the grain pile expands in volume due to temperature changes, the hexagonal corner structure absorbs deformation through its multi-directional extension characteristics, while the rigid connection between the ports and the pipes maintains the stability of gas transmission.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. A nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grain, characterized in that, include: Sealing tents, used to seal grain piles; A nitrogen generator is used to absorb nitrogen-rich gas and purify nitrogen. The two ends of the nitrogen generator are connected to the sealed tent through pipes. A pressure stabilizing component is installed on the pipeline between the nitrogen generator and the sealed tent. The pressure stabilizing component includes a sealing cavity, an elastic element, and a sealing element disposed in the sealing cavity. The two ends of the elastic element are respectively connected to the sealing cavity and the sealing element. An airflow passage is formed between the sealing element and the inner wall of the sealing cavity. The airflow passage can be controlled to unidirectionally conduct under pressure to balance the internal air pressure of the sealed tent.

2. The nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grain according to claim 1, characterized in that, The encapsulation cavity is provided with a conical cavity adapted to the sealing member. The constriction of the conical cavity is integrated with the opening of the encapsulation cavity, and the sealing member can seal the conical cavity.

3. The nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grain according to claim 2, characterized in that, The two conical cavities are symmetrically arranged at both ends of the encapsulation cavity to form a double conical cavity structure; the shape and size of the openings at both ends of the encapsulation cavity are the same.

4. The nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grain according to claim 3, characterized in that, The sealing component is a sealing baffle.

5. The nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grain according to claim 4, characterized in that, The sealing baffle is frustum-shaped, and an annular airflow passage is formed between the sealing baffle and the inner wall of the encapsulation cavity.

6. The nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grain according to claim 1, characterized in that, It also includes a pipeline assembly, which includes a nitrogen filling pipe and a return pipe. The input end of the sealed tent is connected to the nitrogen generator through the nitrogen filling pipe, and the output end of the sealed tent is connected to the nitrogen generator through the return pipe. The pressure stabilizing component is respectively installed on the nitrogen filling pipe and the return pipe, and the pressure stabilizing component can be opened unidirectionally along the airflow direction.

7. The nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grain according to claim 6, characterized in that, Multiple sealed tents are provided, and multiple pipeline components and voltage stabilizing components are provided in conjunction with the sealed tents.

8. The nitrogen-filled insect-proof gas pressure equalization and compensation system for finished grain according to claim 6, characterized in that, The sealed tent is hexagonal, and its two sides are provided with ports for connecting to the nitrogen filling pipe and the return pipe.

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