Nitrogen-enriched air conditioning flow regulating valve structure

Abstract

The application relates to a nitrogen-rich air-conditioning flow regulating valve structure and relates to the technical field of industrial storage and gas protection, which comprises a warehouse body, the outer portion of the warehouse body is fixedly connected with a return air pipeline, the outer portion of the warehouse body is provided with a loop flow mechanism, the loop flow mechanism comprises an air-conditioning pipeline, the outer portion of the air-conditioning pipeline is fixedly connected to the outer portion of the warehouse body, the outer portion of the air-conditioning pipeline is fixedly connected with a regulating valve one, the outer portion of the air-conditioning pipeline is fixedly connected with a regulating valve two, the outer portion of the air-conditioning pipeline is fixedly connected with a regulating valve three, and the outer portion of the air-conditioning pipeline is fixedly connected with a regulating valve four. When air-conditioning operation is carried out, the lower aeration method and the upper aeration method can be switched as required, nitrogen gas generated by a nitrogen generator is guided to flow along a planned path by accurately opening or closing different regulating valves, or exhaust gas is discharged after deepening into a grain pile through a geosyncline vent, or the nitrogen gas penetrates the grain pile from top to bottom through the air-conditioning pipeline.

Description

Technical Field

[0001] This application relates to the field of industrial storage and gas protection technology, and in particular to the structure of a nitrogen-rich gas regulating valve. Background Technology

[0002] In modern industrial production, grain silos, as core facilities for material storage, are widely used in industries such as coal, grain, and chemical raw materials. However, traditional grain silos face numerous technical challenges during operation: materials are prone to deterioration due to oxidation and moisture absorption during storage, especially highly reactive materials, where oxidation reactions can lead to a decline in material quality and even safety hazards; simultaneously, the accumulation of dust in enclosed spaces can easily reach explosive limits, and the high oxygen content inside makes them highly susceptible to dust explosions upon contact with a source of ignition. To overcome these traditional technical bottlenecks, nitrogen-enriched gas technology based on the principle of inert gas protection has emerged. Nitrogen, as a chemically stable inert gas, demonstrates significant advantages in grain silo applications: by replacing the air inside the silo and reducing the oxygen concentration, it can effectively inhibit material oxidation and microbial activity, ensuring material quality from the source.

[0003] The nitrogen protection chamber mainly consists of a high-strength sealed chamber, a nitrogen delivery system, and a gas monitoring and control system. The high-strength chamber ensures airtightness, while the nitrogen delivery system, including storage tanks and pressure reducing valves, is used for precise nitrogen delivery. The monitoring and control system monitors the parameters inside the chamber in real time through various sensors. Its working principle is as follows: the nitrogen delivery system first injects nitrogen into the chamber to replace the air and reduce the oxygen concentration. When the oxygen concentration drops to a safe threshold and the nitrogen concentration reaches the protection requirement, it enters a maintenance mode. During this period, the monitoring system continuously detects the gas composition. If the parameters are abnormal, the control system automatically adjusts the nitrogen delivery volume to maintain a nitrogen-rich environment, thereby protecting the materials and preventing oxidation, deterioration, and dust explosions.

[0004] Current nitrogen-enriched controlled atmosphere storage systems have significant shortcomings in their operation. Most systems use a single mode, allowing only unidirectional gas injection, and cannot flexibly switch between bottom and top injection modes according to storage needs. This results in uneven nitrogen distribution within the grain pile, slow concentration increases, and low controlled atmosphere efficiency. Furthermore, the exhaust gas treatment methods are crude, directly emitting gas without fully utilizing residual nitrogen, leading to resource waste and increased nitrogen production costs. The circulation system design is unreasonable, lacking efficient gas circulation power devices, resulting in poor nitrogen circulation and uneven distribution within the grain pile, affecting pest control effectiveness. In addition, the airtightness of the storage units is substandard, with a short half-life of pressure, making nitrogen prone to leakage and difficult to maintain the controlled atmosphere effect. The pipe materials lack sufficient pressure resistance and corrosion resistance, making them prone to leakage or damage during high-pressure gas transportation, and lacking adequate protective measures. The equipment is highly susceptible to environmental influences, has a short service life, and cannot meet the long-term, stable nitrogen-enriched controlled atmosphere storage requirements. Therefore, a nitrogen-enriched controlled atmosphere circulation regulating valve structure is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this application is to provide a structure for a nitrogen-enriched gas-controlled circulating valve, which aims to improve the problems of existing technologies such as single gas-controlled mode, uneven nitrogen distribution, serious waste of tail gas, low circulating efficiency, poor airtightness of the chamber, and insufficient equipment protection that makes it easy to be damaged.

[0006] The nitrogen-enriched atmosphere control valve provided in this application adopts the following technical solution: it includes a chamber, a return air duct is fixedly connected to the outside of the chamber, and a recirculation mechanism is provided on the outside of the chamber; the recirculation mechanism includes an atmosphere control pipe, which is fixedly connected to the outside of the chamber, and is fixedly connected to the outside of the atmosphere control pipe by regulating valve one, regulating valve two, regulating valve three, regulating valve four, regulating valve five, and a detection pipe; a pipe port assembly is provided between the atmosphere control pipe and the outside of the chamber. Through the above technical solution, the chamber, return air duct, and recirculation mechanism work together to form a complete nitrogen-enriched controlled atmosphere circulation system. The controlled atmosphere pipe is equipped with multiple regulating valves to precisely control the gas flow direction and flow rate, enabling switching between various controlled atmosphere modes such as bottom-filling and top-filling. The detection pipe monitors the gas concentration in real time, and the pipe port components provide multiple interfaces to ensure efficient connection between the controlled atmosphere pipe and equipment such as the nitrogen generator and ventilation system, significantly improving the flexibility and accuracy of controlled atmosphere operations.

[0007] Preferably, the pipe port assembly includes a mechanical ventilation port, the mechanical ventilation port is fixedly connected to the outside of the silo body, the outside of the silo body is fixedly connected to a natural ventilation port, a nitrogen gas pipe is provided on the outside of the controlled atmosphere pipe, a ground trench ventilation port is opened at the bottom of the controlled atmosphere pipe, a silo bottom ventilation pipe interface is provided at the top of the controlled atmosphere pipe, an upper air filling and exhaust interface is provided on the right side of the controlled atmosphere pipe, and a return air pipe interface is provided on the left side of the controlled atmosphere pipe. Through the above technical solution, the pipe port component integrates multiple functional interfaces. The mechanical ventilation port and the natural ventilation port are symmetrically distributed to achieve a combination of mechanical forced ventilation and natural convection ventilation, ensuring efficient air circulation in the warehouse. The nitrogen pipeline connects to the nitrogen generator to continuously supply gas for the controlled atmosphere operation. The ground trough ventilation port, the warehouse bottom ventilation pipe interface, etc., work together with the ventilation system to ensure that nitrogen can penetrate the grain pile evenly. The top air filling method exhaust interface and the return air pipe interface respectively ensure the exhaust of exhaust gas and gas circulation, optimizing the controlled atmosphere process.

[0008] Preferably, a control box is fixedly connected to the outside of the silo, and a canopy is fixedly connected to the outside of the silo. Through the above technical solutions, the control box integrates an intelligent control system, which can automatically monitor and control equipment such as regulating valves and fans, thereby improving the intelligence and operational efficiency of controlled atmosphere operations; the canopy is made of rainproof and sunproof materials, providing protection for the warehouse and external equipment, avoiding environmental factors from affecting equipment performance, extending equipment service life, and ensuring the stable operation of the controlled atmosphere system.

[0009] Preferably, the natural ventilation openings and the mechanical ventilation openings are symmetrically distributed on the outside of the chamber, and a centrifugal fan is fixedly connected to the outside of the controlled atmosphere pipe; Through the above technical solution, the natural ventilation openings and mechanical ventilation openings are symmetrically arranged to achieve the complementary advantages of natural air circulation and mechanical auxiliary ventilation in the warehouse. The ventilation mode can be flexibly switched according to actual needs, effectively regulating the temperature, humidity and air quality in the warehouse. The centrifugal fan, as the power source for gas circulation, provides stable airflow for controlled atmosphere operation, promotes the circulation of nitrogen in the system, and ensures that nitrogen is evenly distributed throughout the grain pile.

[0010] Preferably, the externally fixed connection of the regulating atmosphere pipe is to the inside of the control box; With the above technical solution, the controlled atmosphere pipe is fixedly connected inside the control box, which facilitates the unified management and real-time control of the regulating valve and other components on the controlled atmosphere pipe by the control box. This makes the adjustment of controlled atmosphere operation parameters more convenient and accurate, and enhances the coordination and stability of the controlled atmosphere system operation.

[0011] Preferably, the output end of the centrifugal fan is fixedly connected inside the ventilation opening of the trench; Through the above technical solution, the output end of the centrifugal fan is connected to the ventilation opening of the trough, providing strong power for nitrogen circulation. During the circulation operation, nitrogen can be forcibly pushed into the grain pile along the ventilation opening of the trough and circulated through the circulation pipe to ensure that nitrogen efficiently penetrates to every corner of the grain pile, achieves uniform distribution, and improves the effect of modified atmosphere pest control.

[0012] Preferably, the externally fixed connection of the regulating air pipe is to the inside of the return air duct.

[0013] Through the above technical solution, the controlled atmosphere pipe is fixedly connected to the return air pipe, which deeply integrates the controlled atmosphere system with the ventilation system. This allows the gas generated during the controlled atmosphere operation to flow into the return air pipe and participate in the large-scale gas circulation within the warehouse, optimizing the gas circulation path, improving gas utilization, and further ensuring the stability of the gas environment within the warehouse.

[0014] In summary, this application has the following beneficial technical effects: 1. This utility model significantly improves the efficiency and economy of nitrogen-enriched modified atmosphere (MAP) through multi-mode MAP operation and exhaust gas recycling. During MAP operation, the bottom-filling method and the top-filling method can be switched as needed. By precisely opening or closing different regulating valves, the nitrogen generated by the nitrogen generator is guided to flow along the planned path, or the exhaust gas is discharged after entering the grain pile through the ground vent, or the MAP pipe runs through the grain pile from top to bottom. Both methods can achieve airflow pressure balance in the silo and quickly increase the nitrogen concentration. The exhaust gas generated during the operation contains some nitrogen. By connecting the regulating valves between different silos through hoses, the exhaust gas can be transported to other silos for reuse, avoiding nitrogen waste and reducing nitrogen production costs. The circulation system uses a dedicated fan to drive nitrogen gas through the grain pile, ventilation trough, and circulation pipes, ensuring uniform nitrogen distribution. When insufficient concentration is detected, gas replenishment and circulation can be carried out simultaneously to maintain a high-concentration environment and effectively kill pests. In addition, the design of high-airtightness storage, pressure-resistant gas conditioning pipes, and corrosion-resistant pipelines, along with rainproof and heat-insulating protective measures, ensures long-term stable operation of the equipment and provides reliable technical support for nitrogen-enriched gas-conditioned grain storage. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the structure of a nitrogen-enriched gas regulating and circulating valve proposed in this utility model. Figure 2 This is a schematic diagram of the return air duct structure of a nitrogen-rich gas regulating and circulating valve proposed in this utility model. Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the structure of the gas regulating pipe for a nitrogen-rich gas regulating circulating valve proposed in this utility model.

[0016] Legend: 1. Silo body; 2. Return air duct; 3. Shelter; 4. Circulating recirculation mechanism; 41. Regulated atmosphere pipe; 42. Regulating valve one; 43. Regulating valve two; 44. Regulating valve three; 45. Regulating valve four; 46. Regulating valve five; 47. Detection pipe; 48. Pipe port assembly; 481. Nitrogen pipe connection; 482. Return air duct connection interface; 483. Silo bottom ventilation pipe interface; 484. Ground trough ventilation opening; 485. Natural ventilation opening; 486. Mechanical ventilation opening; 487. Top inflation exhaust interface; 5. Control box; 6. Centrifugal fan. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail below.

[0018] Example: A structure of a nitrogen-enriched gas regulating valve, referring to... Figures 2 to 4The system includes a storage chamber 1, which is constructed with high-strength, high-airtightness materials to provide a stable and sealed space for nitrogen-enriched controlled atmosphere (CA) operations, effectively preventing nitrogen leakage and ensuring the CA effect. The storage chamber 1 is externally connected to a return air duct 2, which is used to create a gas circulation path within the storage chamber, promptly expelling exhaust gases generated during CA operations and excess moisture within the storage chamber, maintaining a stable air environment inside the storage chamber, and simultaneously working with the CA system to achieve efficient gas recycling. The storage chamber 1 is externally equipped with a recirculation mechanism 4, which, as the core component of the nitrogen-enriched CA system, integrates gas regulation and circulation functions. By precisely controlling the gas flow direction and flow rate, it ensures that nitrogen is evenly distributed within the storage chamber, achieving the goals of efficient pest control and grain preservation.

[0019] Specifically, the chamber is constructed with high-strength, high-airtightness materials to ensure that the half-life of the actual chamber pressure dropping from 500Pa to 250Pa is not less than 240s, effectively preventing nitrogen leakage; the return air duct is fixedly connected to the outside of the chamber to form a gas circulation path to discharge exhaust gas and moisture; the recirculation mechanism is integrated into the outside of the chamber, and by regulating the gas flow direction and flow rate, it can achieve uniform distribution of nitrogen in the chamber, providing a basic guarantee for nitrogen-enriched gas conditioning operations.

[0020] The recirculation mechanism 4 includes a gas regulating pipe 41, which is externally fixed to the outside of the chamber 1. The gas regulating pipe 41 is made of a material with a pressure resistance rating of not less than 0.8 MPa, capable of withstanding high-pressure gas transmission during gas regulation operations, ensuring safe and stable gas transmission and avoiding leakage risks. A series of regulating valves are sequentially fixedly connected to the gas regulating pipe 41: regulating valve one 42, regulating valve two 43, regulating valve three 44, regulating valve four 45, and regulating valve five 46. These regulating valves are all electrically controlled butterfly valves, which can be remotely or automatically adjusted through an intelligent control system to precisely control the gas flow direction and flow rate within the gas regulating pipe 41, flexibly switching between different filling methods. Multiple controlled atmosphere operation modes, such as top-filling, meet the needs of different grain storage scenarios. The controlled atmosphere pipe 41 is externally fixedly connected to a detection pipe 47, which is connected to a nitrogen concentration detection device to monitor the changes in nitrogen concentration in the controlled atmosphere pipe in real time, providing operators with accurate data so as to adjust the controlled atmosphere operation parameters in a timely manner and ensure that the nitrogen concentration in the warehouse is maintained within the effective range for pest control and preservation. The controlled atmosphere pipe 41 and the warehouse body 1 are provided with a pipe port assembly 48. The pipe port assembly 48 integrates multiple functional interfaces to realize efficient connection between the controlled atmosphere pipe 41 and nitrogen generators, ventilation systems, other warehouse equipment, etc., and build a complete controlled atmosphere operation network.

[0021] Specifically, the controlled atmosphere pipe is made of a material with a pressure resistance of not less than 0.8MPa and is fixed to the outside of the chamber. The electrically controlled butterfly valve on it can be remotely adjusted, and different modes such as bottom filling method and top filling method can be switched by opening or closing different valves. The detection pipe monitors the nitrogen concentration in real time, and the pipe port component integrates multiple interfaces to achieve efficient connection with nitrogen generator and ventilation system, and build a complete controlled atmosphere operation network.

[0022] Reference Figure 1 , Figure 2 and Figure 4 The pipe assembly 48 includes a mechanical ventilation port 486, which is externally fixedly connected to the outside of the silo body 1. The mechanical ventilation port 486 is equipped with a high-power mobile centrifugal fan 6 with a unit ventilation volume of not less than 4 m² / ht. It can be activated when rapid ventilation is needed to quickly refresh the air in the silo through forced ventilation, reduce the humidity and temperature in the silo, and improve the grain storage environment. The outside of the silo body 1 is also fixedly connected to a natural ventilation port 485. The natural ventilation port 485 and the mechanical ventilation port 486 are symmetrically distributed on the outside of the silo body 1. The natural ventilation port 485 utilizes the principle of natural convection to provide passive ventilation when the external environment is suitable, which is energy-saving and environmentally friendly. It complements the mechanical ventilation port 486 to ensure that the air in the silo always maintains a good circulation state and meets different ventilation needs. The controlled atmosphere pipe 41 is externally equipped with a nitrogen gas pipeline 481, which is connected to a mobile nitrogen generator as an input channel for high-purity nitrogen gas, providing a continuous and stable gas supply for nitrogen-enriched controlled atmosphere operations and ensuring the smooth operation of controlled atmosphere operations.

[0023] Specifically, the mechanical ventilation openings are equipped with high-power centrifugal fans with a unit ventilation volume of ≥4m² / ht, which can quickly refresh the air in the chamber by forced entry; the natural ventilation openings and mechanical ventilation openings are symmetrically distributed, utilizing natural convection for passive ventilation, and the two complement each other to maintain air circulation in the chamber; a nitrogen pipeline is connected to a nitrogen generator to continuously supply high-purity nitrogen for controlled atmosphere operations.

[0024] The bottom end of the controlled atmosphere pipe 41 is provided with a ground vent 484, which is connected to a "U"-shaped ground vent channel. The ventilation channel has an opening ratio of 25% to 35%, which can ensure that the gas is evenly diffused to all parts of the grain pile and prevent grain leakage. In controlled atmosphere operation, the ground vent 484 is the key channel for nitrogen to enter the grain pile, ensuring efficient nitrogen penetration. The top end of the controlled atmosphere pipe 41 is provided with a bottom ventilation pipe interface 483, which can be connected to other auxiliary ventilation or controlled atmosphere pipes to flexibly expand the controlled atmosphere operation. The system functions to enable collaborative operation of multiple chambers 1 or gas allocation in special scenarios. The right side of the gas regulating pipe 41 is provided with an upper inflation exhaust port 487. When performing upper inflation operation, this port promptly discharges the exhaust gas in the chamber, maintains the airflow pressure balance in the chamber, and ensures continuous and stable nitrogen filling. The left side of the gas regulating pipe 41 is provided with a return air duct port 482. The return air duct port 482 is connected to the return air duct 2, so that the gas in the gas regulating pipe participates in the large circulation in the chamber, improves the gas utilization rate, and promotes the uniform distribution of nitrogen in the chamber.

[0025] Specifically, the ventilation openings of the troughs are connected to the "gui"-shaped trough ventilation channels, and the 25% to 35% opening rate ensures that nitrogen permeates the grain pile evenly; the bottom ventilation pipe interface can be connected to auxiliary pipes to realize multi-bin collaborative operation; the upper air-filling exhaust interface discharges tail gas during operation to maintain pressure balance; the return air pipe interface is connected to the return air pipe to promote nitrogen participation in the large gas circulation in the bin.

[0026] A control box 5 is fixedly connected to the external exterior of the silo body 1. The control box 5 integrates an intelligent control system, which can automatically monitor and control equipment such as regulating valves, fans, and detection devices. Operators can set parameters through the control box 5 to achieve intelligent operation of controlled atmosphere and ventilation operations, reducing manual intervention and improving operational accuracy and efficiency. A shelter 3 is also fixedly connected to the external exterior of the silo body 1. The shelter 3 is made of rainproof, sunproof, and heat-insulating materials, providing protection for the silo body 1 and external equipment, avoiding direct sunlight, rain erosion, and extreme temperature effects, extending equipment lifespan, and ensuring stable operation of the controlled atmosphere system. A centrifugal fan 6 is fixedly connected to the external exterior of the controlled atmosphere pipe 41. The output end of the centrifugal fan 6 is fixedly connected inside the ground trench ventilation opening 484. The centrifugal fan 6 serves as the power source for the circulation operation, with a power of less than 1kW, a wind pressure of less than 1000Pa, and an air volume of less than 1000m³ / h. The gas exchange rate inside the warehouse is maintained at 2-10 times per day. During the circulation process, nitrogen is forcibly circulated to ensure that nitrogen permeates evenly to every corner of the grain pile. The external of the controlled atmosphere pipe 41 is fixedly connected to the inside of the control box 5, which facilitates the unified control and real-time monitoring of the regulating valves and other equipment on the controlled atmosphere pipe by the control box 5, ensuring the stability and coordination of the controlled atmosphere system. At the same time, the external of the controlled atmosphere pipe 41 is also fixedly connected to the inside of the return air duct 2, realizing the deep integration of the controlled atmosphere system and the ventilation system, optimizing the gas circulation path inside the warehouse, and improving the overall operational efficiency.

[0027] Specifically, the control box integrates an intelligent system to automatically monitor and control equipment such as regulating valves and fans, reducing manual intervention; the canopy is made of protective materials to isolate sunlight, rain and extreme temperatures; the centrifugal fan has a power of <1kW and a wind pressure of <1000Pa, driving nitrogen circulation with a gas exchange frequency of 2 to 10 times / day; the gas regulation pipe is connected to the control box and the return air duct to realize system coordinated control and gas circulation path optimization.

[0028] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A nitrogen-enriched gas regulating and circulating valve structure, comprising a chamber (1), characterized in that: The external of the chamber (1) is fixedly connected to a return air duct (2), and the external of the chamber (1) is provided with a circulating return mechanism (4). The circulating recirculation mechanism (4) includes a regulating pipe (41), which is fixedly connected to the outside of the chamber (1). The regulating pipe (41) is fixedly connected to a regulating valve one (42), a regulating valve two (43), a regulating valve three (44), a regulating valve four (45), a regulating valve five (46), and a detection pipe (47). A pipe port assembly (48) is provided between the regulating pipe (41) and the outside of the chamber (1).

2. The structure of the nitrogen-enriched gas regulating valve according to claim 1, characterized in that: The pipe port assembly (48) includes a mechanical ventilation port (486), which is fixedly connected to the outside of the silo body (1). A natural ventilation port (485) is fixedly connected to the outside of the silo body (1). A nitrogen gas pipe (481) is provided on the outside of the controlled atmosphere pipe (41). A ground vent (484) is provided at the bottom of the controlled atmosphere pipe (41). A silo bottom ventilation pipe interface (483) is provided at the top of the controlled atmosphere pipe (41). An upper air filling and exhaust interface (487) is provided on the right side of the controlled atmosphere pipe (41). A return air pipe interface (482) is provided on the left side of the controlled atmosphere pipe (41).

3. The structure of the nitrogen-enriched gas regulating valve according to claim 2, characterized in that: The outer side of the silo (1) is fixedly connected to a control box (5) and a canopy (3).

4. The structure of a nitrogen-rich gas regulating valve according to claim 3, characterized in that: The natural ventilation opening (485) and the mechanical ventilation opening (486) are symmetrically distributed on the outside of the chamber (1), and a centrifugal fan (6) is fixedly connected to the outside of the regulating atmosphere pipe (41).

5. The structure of a nitrogen-rich gas regulating valve according to claim 4, characterized in that: The external gas regulating pipe (41) is fixedly connected to the inside of the control box (5).

6. The structure of a nitrogen-enriched gas regulating valve according to claim 5, characterized in that: The output end of the centrifugal fan (6) is fixedly connected inside the ground trench ventilation opening (484).

7. The structure of a nitrogen-rich gas regulating valve according to claim 2, characterized in that: The external of the regulating air pipe (41) is fixedly connected to the inside of the return air duct (2).

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