Barn pressure control device

Abstract

The utility model discloses granary pressure control equipment, include: evaporation cavity, be equipped with evaporator and evaporation fan in evaporation cavity, be used for the air supply pipe subassembly and return air pipe subassembly of intercommunication evaporation cavity and granary, a plurality of air valves are arranged in air supply pipe subassembly and return air pipe subassembly respectively, control unit, with pressure sensor, temperature sensor, CO2 concentration sensor and each air valve electricity is connected, wherein, control unit is used for judging the cause of pressure imbalance in the storehouse according to the detection result of pressure, temperature and CO2 concentration in the storehouse, and the opening or closing state of each air valve is controlled correspondingly, to realize the pressure regulation in granary. The utility model discloses through the structural reconstruction and control logic upgrading of existing granary air conditioning equipment, integrates the pressure regulation in the storehouse, CO2 concentration regulation and air conditioning refrigeration function in the same equipment, realizes the collaborative control of granary environment.

Description

Technical Field

[0001] This utility model relates to the field of grain storage technology, and in particular to grain silo pressure control equipment. Background Technology

[0002] As grain silo construction develops towards higher airtightness and greater intelligence, internal pressure balance has become a key factor in ensuring grain storage safety. During storage, grain silos generally maintain a slightly positive pressure to effectively prevent external contamination. Excessive pressure can lead to structural deformation and damage to seals, while also hindering air circulation within the grain pile, causing CO2 and water vapor accumulation and affecting grain quality. Conversely, insufficient pressure can allow humid air to seep in and cause the grain to absorb moisture, both of which can result in decreased grain quality and wear and tear on storage equipment.

[0003] Traditional control systems often only adjust for pressure changes, i.e., when the pressure inside the storage silo exceeds a preset threshold, they activate the air valve for simple exhaust or replenishment, without establishing a correlation mechanism between pressure changes and their causes. This leads to a disconnect between the adjustment measures and the essence of the problem, which may cause certain problems for grain storage. For example, grain produces CO2 and water vapor through respiration, which increases the pressure inside the storage silo. If the pressure is only adjusted by the exhaust valve, the CO2 concentration is not reduced simultaneously, which continuously exacerbates the risk of abnormally high CO2 concentration and affects the quality of stored grain. A search of existing technologies has not yet found a solution that correlates the pressure changes inside the storage silo with their causes. Utility Model Content

[0004] To solve at least one of the above-mentioned technical problems, on the one hand, this utility model provides a grain silo pressure control device, which adds an air duct to the return air and supply air duct respectively, and sets a controllable airtight valve, which can realize the integration of exhaust, air replenishment, and CO2 concentration regulation functions with refrigeration equipment. The integrated design eliminates the need for additional equipment and reduces equipment costs.

[0005] On the other hand, this utility model also proposes a pressure control method with the aforementioned grain silo pressure control equipment. By identifying different silo environmental conditions, the cause of pressure imbalance in the silo is determined, and then different treatment measures are taken to solve the problem of the traditional solution that only adjusts the single appearance of pressure change in the silo, thereby ensuring the quality of grain storage.

[0006] The technical solution adopted in this utility model is to design a grain silo pressure control device, 1. a grain silo pressure control device, characterized in that it includes:

[0007] An evaporation chamber is provided, which contains an evaporator and an evaporation fan;

[0008] Air supply duct assembly and return duct assembly for connecting the evaporation chamber and the grain silo;

[0009] Multiple air valves are respectively installed in the supply air duct assembly and the return air duct assembly;

[0010] The control unit is electrically connected to the pressure sensor, temperature sensor, CO2 concentration sensor, and each of the aforementioned air valves;

[0011] In some embodiments, the air supply duct assembly includes a first air supply duct and a second air supply duct, the first air supply duct connecting the evaporation chamber and the grain silo, the second air supply duct connecting the first air supply duct and the atmosphere, the first air supply duct being provided with a second air valve, and the second air supply duct being provided with a first air valve.

[0012] In some embodiments, the return air duct assembly includes a first return air duct and a second return air duct, the first return air duct connecting the evaporation chamber and the grain silo, the second return air duct connecting the first return air duct and the atmosphere, the first return air duct being provided with a third air valve, and the second return air duct being provided with a fourth air valve.

[0013] In some embodiments, the air valve is a flow control valve with adjustable opening.

[0014] In some implementations, both the supply air duct assembly and the return air duct assembly are equipped with flow detection units to feed back air volume data to the control unit, thereby achieving closed-loop control of pressure and temperature regulation.

[0015] In some embodiments, the second air supply duct connects to the upper part of the middle section of the first air supply duct.

[0016] In some embodiments, the port of the second air supply duct that communicates with the atmosphere is bent downwards.

[0017] In some implementations, the second return air duct connects to the upper part of the middle section of the first return air duct.

[0018] In some implementations, the port of the second return air duct that connects to the atmosphere is bent downwards.

[0019] In some embodiments, a condenser is also included, which is located in the same housing as the evaporator and is located below the evaporator.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This invention integrates pressure regulation, CO2 concentration regulation, and air conditioning cooling functions into a single device by structurally modifying and upgrading the control logic of existing grain silo air conditioning equipment, achieving coordinated control of the grain silo environment. By installing multi-channel ducts and controllable airtight valves in the supply and return air ducts, air replenishment, exhaust, and fresh air introduction within the silo can be completed without adding independent exhaust, replenishment, or gas regulation equipment, effectively reducing system construction and maintenance costs. Compared to existing control methods that simply adjust based on pressure thresholds, the introduction of a pressure cause identification mechanism can distinguish between different operating conditions such as grain inflow, grain outflow, grain respiration, and temperature changes, and perform quantitative airflow calculation and precise adjustment for different causes, avoiding overcompensation or adjustment lag. Simultaneously, by identifying and diluting the CO2 concentration generated by grain respiration, the accumulation of CO2 and water vapor within the silo can be effectively suppressed, improving the internal gas environment of the grain pile and reducing the risk of grain mold and quality deterioration. The overall solution has a simple structure, high integration, and strong adaptability, which can significantly improve the storage safety, operational stability, and intelligent management level of high-airtightness grain silos. Attached Figure Description

[0022] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings. To illustrate the details and facilitate understanding of its principles, the drawings are not necessarily to scale, and similar reference numerals may describe similar components in different views. The accompanying drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Wherein:

[0023] Figure 1 This is a 3D schematic diagram of the grain silo pressure control equipment.

[0024] Figure 2 This is a top view schematic diagram of the grain silo pressure control equipment.

[0025] Figure 3 This is a schematic diagram of the air supply component.

[0026] Figure 4 This is a schematic diagram of the return air assembly.

[0027] Figure 5 This is a flowchart illustrating the pressure control method.

[0028] Figure 6 This is a schematic diagram of the control process considering whether the CO2 concentration exceeds the limit.

[0029] Figure 7 This is a schematic diagram of the control process that comprehensively considers whether the CO2 concentration and warehouse temperature are abnormal.

[0030] In the diagram, 10 is the equipment condensation chamber; 11 is the equipment evaporation chamber; 12 is the return air duct assembly; 13 is the supply air duct assembly; 20 is the first supply air duct; 21 is the second supply air duct; 22 is the first air valve; 23 is the second air valve; 24 is the grain depot wall; 25 is the adjustable third air valve; 26 is the fourth air valve; 27 is the second return air duct; and 28 is the first return air duct. Detailed Implementation

[0031] The following are specific embodiments of this utility model, and the technical solution of this utility model will be further described with reference to the accompanying drawings. However, this utility model is not limited to these embodiments, and the following embodiments do not limit the utility model involved in the claims. In addition, all combinations of features described in the embodiments are not necessarily necessary for the solution of the utility model.

[0032] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0033] Example

[0034] With the continuous development of modern grain storage technology, grain silo construction is gradually evolving towards high airtightness, high automation, and high intelligence. Compared to traditional ventilated grain silos, new high-airtight grain silos, by improving the sealing performance of their enclosure structure, can effectively isolate the intrusion of external air, moisture, and harmful organisms, providing a basic condition for the long-term safe storage of grain. However, in a high-airtight environment, the internal air system transforms from an "open system" to a "quasi-closed system," and the impact of pressure differences between the inside and outside of the silo on grain storage safety, silo structural stability, and the reliability of supporting equipment is significantly enhanced. Therefore, pressure balance control within the silo has become one of the key technical issues in the operation and management of high-airtight grain silos.

[0035] In actual grain storage, grain silos are typically maintained under a slightly positive pressure. By keeping the internal pressure slightly higher than the external ambient pressure, it effectively prevents humid air, dust, and pests from seeping into the silo through gaps and negatively impacting grain quality. However, higher pressure is not always better. If the internal pressure is consistently or momentarily too high, it can easily lead to the following problems:

[0036] On the one hand, excessive internal pressure may cause abnormal stress in the silo structure, resulting in micro-deformation of the silo walls and roof, which in turn accelerates the aging and cracking of sealing materials and reduces the overall airtightness of the grain silo. On the other hand, abnormally high pressure will inhibit the natural convection and uniform distribution of air inside the silo, causing local stagnation zones to form inside the grain pile, resulting in the accumulation of carbon dioxide (CO2) and water vapor in local spaces, forming "gas pockets" and exacerbating the risk of grain mold, condensation and quality deterioration.

[0037] Conversely, if the pressure inside the storage facility is lower than the external ambient pressure, high-humidity air from outside may seep into the facility under the influence of the pressure difference, causing the grain to absorb moisture and become damp, which can then lead to overheating, mold growth, and pest infestation. Furthermore, negative pressure can accelerate air infiltration through gaps in the storage structure, speeding up equipment aging and increasing maintenance costs. Therefore, both excessively high and low pressures can negatively impact grain safety, grain quality, and the lifespan of storage equipment.

[0038] Existing grain silo pressure control systems mostly employ a single-parameter threshold control strategy, which only monitors the pressure value inside the silo. When the pressure exceeds or falls below a set threshold, it is simply adjusted by opening an exhaust valve or a replenishment valve. This control method fails to differentiate and analyze the causes of pressure changes, ignoring the underlying physical or biochemical processes, resulting in a disconnect between the adjustment measures and the essence of the problem, and exhibiting significant limitations.

[0039] For example, during grain storage, the grain itself undergoes continuous respiration, constantly consuming oxygen and releasing carbon dioxide and water vapor, thus causing changes in the gas composition within the storage silo and pushing up the pressure. If the control system only activates the exhaust valve to regulate pressure based on the pressure over-limit signal, without simultaneously controlling the CO2 concentration within the silo, the pressure may decrease in the short term, but the CO2 concentration will continue to rise, ultimately still adversely affecting the grain quality and even accelerating its physiological deterioration. Similarly, during mechanical operations such as grain loading and unloading, changes in grain volume and movement of the grain pile will also cause pressure fluctuations within the silo. If ventilation is adjusted indiscriminately, it can easily lead to unreasonable airflow configuration, increased energy consumption, and affected system stability.

[0040] A search of existing technologies has revealed no grain warehouse air conditioning and pressure regulation scheme capable of systematically correlating changes in warehouse pressure with their causes and implementing differentiated control strategies accordingly. To address this issue, this invention proposes a grain warehouse air conditioning device and its intelligent pressure control method based on cause-based discrimination. By correlating changes in warehouse pressure with multiple factors such as grain inflow, grain outflow, grain respiration, and temperature changes, it achieves refined and intelligent control of the gas state within the warehouse.

[0041] like Figure 1 , 2As shown, the grain silo air conditioning equipment in this embodiment adopts a layered structure, comprising an evaporator chamber and a condenser chamber of the refrigeration unit. The evaporator chamber is located on the upper layer, and the condenser chamber is located on the lower layer. The evaporator chamber contains an evaporator and an evaporative fan, with air supply and return vents on its side walls or ends. The condenser chamber contains the condenser, a condenser fan, and a compressor, among other core components of the refrigeration system. The evaporator chamber is connected to the internal space of the grain silo via an air supply duct assembly 13, and air from inside the silo is recycled back to the evaporator chamber via a return duct assembly 12, thus establishing a stable and controllable air circulation system within the silo. The evaporator chamber and the condenser chamber are located within the same casing.

[0042] like Figure 3 , 4 As shown, the air supply duct assembly 13 mainly consists of a first air supply duct 20, a second air supply duct 21, a first air valve 22, and a second air valve 23. The first air supply duct 20 is directly connected to an air outlet on the grain silo wall, and the second air valve 23 is installed inside the first air supply duct 20. The second air supply duct 21 branches off from the first air supply duct 20, and the first air valve 22 is installed inside the second air supply duct 21. By controlling the combination of the first air valve 22 and the second air valve 23, the air supply direction and path can be switched, thereby flexibly adjusting the air volume and airflow organization within the silo.

[0043] The return air duct assembly 12 mainly consists of a first return air duct 28, a second return air duct 27, a third air valve, and a fourth air valve 26. The first return air duct 28 is connected to the return air inlet on the warehouse wall, and the third air valve is installed inside the first return air duct 28. The second return air duct 27 branches off from the first return air duct 28, and the fourth air valve 26 is installed inside the second return air duct 27. Through the coordinated control of the third air valve and the fourth air valve 26, the recovery, discharge, and air exchange with the outside air within the warehouse can be achieved, thereby enabling precise control of the ventilation volume and the connection between the inside and outside air within the warehouse.

[0044] Each air valve is a flow control valve with adjustable opening. The second air supply pipe is connected to the upper part of the middle of the first air supply pipe. The port of the second air supply pipe that connects to the atmosphere is bent downwards. The second return air pipe is connected to the upper part of the middle of the first return air pipe. The port of the second return air pipe that connects to the atmosphere is bent downwards.

[0045] like Figure 5 As shown, during operation, the system control unit collects information such as pressure, temperature, CO2 concentration, opening and closing status of each air valve, and unit operating parameters inside and outside the silo in real time, and makes comprehensive judgments based on preset control logic. When the grain silo is running normally, the silo maintains a slightly positive pressure state. In this embodiment, the target slightly positive pressure is set to 5MPa (example value, which can be adjusted according to the actual silo type).

[0046] The system control unit or controller mentioned here refers to an electronic device or other device or system capable of automated control (such as a bleed valve, water jet propulsion device, etc.) that can control other devices by processing and judging received signals (such as signals from temperature sensors) or instructions through software. For example, the control unit can be a central processing unit (CPU), microcontroller unit (MCU), system on chipset (SoC), application-specific integrated circuit (ASIC), programmable logic device (PLD), microcontroller, industrial control computer, or a combination thereof. Of course, using the control unit to control the operation of another device based on the detection signal of the sensor is a basic existing technology in the field of automation, and the specific circuit connections and software settings will not be elaborated here.

[0047] When the pressure inside the warehouse is detected to be lower than the pressure outside the warehouse, and the duration is T C If the delay exceeds 10 seconds, the system first determines whether mechanical operation is occurring, focusing on whether grain is being discharged. If grain is confirmed to be discharging from the silo, it can be determined that the pressure drop is primarily due to a reduction in grain volume. In this case, compensating airflow needs to be supplied to the silo to fill the space created by the grain discharge. The compensating airflow Q1 must satisfy the following relationship:

[0048] ;

[0049] Where V1 is the grain discharge rate, t1 is the grain discharge duration, C is the grain bulk density constant, taken as 0.75 t / m³, and K1 is a correction coefficient, taking into account the air suction effect during the grain pile settling process, with a value of 1.2. The control unit controls the operation of the air valves according to the calculation results, closing the third air valve and the first air valve 22, opening the fourth air valve 26 and the second air valve 23, and simultaneously monitoring the air velocity at the air outlet and converting it into the actual air volume to determine the air supply duration.

[0050] If the system determines that there is no grain dispensing operation, it further checks for blockages in the supply and return air ducts. By comparing the current wind speed and air volume data with the baseline parameters when the equipment is operating normally, if a significant deviation is found, it determines that there may be a pipe blockage and issues an alarm; if no abnormality is found, the system cannot determine the specific cause and similarly issues an abnormality alarm to prompt manual verification.

[0051] When the pressure inside the chamber exceeds 5 MPa and the duration is T CIf the time exceeds 10 seconds, the system first determines whether grain feeding is in progress. If grain feeding is confirmed, the system determines that the pressure increase is caused by the increase in grain volume and entrained air. In this case, the air inside the silo needs to be evacuated, and the evacuation air volume Q2 should meet the following requirements:

[0052] ;

[0053] Where V2 is the feed rate, t2 is the feed time, and K2 is a correction coefficient with a value of 1.2. The control unit controls the air valves accordingly, closing the second air valve 23 and the fourth air valve 26, opening the third air valve and the first air valve 22, and determining the pumping duration through wind speed feedback.

[0054] like Figure 6 As shown, if there is no grain feeding operation, the CO2 concentration inside the silo is further assessed. When the CO2 concentration exceeds a preset threshold, it can be determined that the pressure increase is mainly caused by grain respiration. At this time, it is necessary to dilute the gas inside the silo by introducing fresh outside air, and the required air supply volume Q3 must meet the following requirements:

[0055] ;

[0056] Where M is the total mass of grain in the warehouse, γ is the rate at which grain respiration produces CO2, and ΔC CO2 The system addresses the CO2 concentration difference between the inside and outside of the storage chamber. It achieves air exchange by opening the fourth air valve 26, the second air valve 23, and the third air valve, and determines the air supply time by monitoring wind speed.

[0057] like Figure 7 As shown, if the CO2 concentration is normal, the internal temperature is further assessed. When the internal temperature is higher than the set temperature T0, it can be determined that the pressure increase is mainly caused by the thermal expansion effect caused by the temperature increase, and the system enters the cooling operation mode to reduce the internal temperature by properly configuring the air valves and the refrigeration system; if the temperature is also within the normal range, the system determines it to be an unknown anomaly, triggers an alarm, and prompts manual intervention.

[0058] Through the above structural design and control methods, this utility model realizes intelligent identification and targeted regulation of the causes of pressure changes in grain silos, significantly improving the safety, stability and intelligence level of grain silo operation.

[0059] This embodiment modifies existing grain silo air conditioning equipment by adding two air ducts to both the return and supply air pipes, and installing controllable airtight valves. This integrates exhaust, replenishment, and CO2 concentration regulation functions with the refrigeration equipment, creating a single integrated design. A single unit can simultaneously meet the needs of refrigeration, silo pressure regulation, and CO2 concentration regulation, significantly reducing equipment costs. This embodiment also establishes precise judgment conditions for identifying the causes of silo pressure imbalance, fundamentally solving the problem and preventing misjudgments that could lead to a decline in grain quality. Furthermore, this embodiment quantifies the pressure adjustment compensation based on different causes of pressure imbalance, minimizing the risk of overcompensation and other lag issues.

[0060] This embodiment integrates pressure regulation, CO2 concentration regulation, and air conditioning cooling functions within the existing grain silo air conditioning equipment through structural modifications and control logic upgrades, achieving coordinated control of the grain silo environment. By installing multi-channel ducts and controllable airtight valves in the supply and return air ducts, air replenishment, exhaust, and fresh air introduction within the silo can be completed without adding independent exhaust, replenishment, or gas regulation equipment, effectively reducing system construction and maintenance costs. Compared to existing control methods that simply adjust based on pressure thresholds, the introduction of a pressure cause identification mechanism can distinguish between different operating conditions such as grain inflow, grain outflow, grain respiration, and temperature changes, and perform quantitative airflow calculation and precise adjustment for different causes, avoiding overcompensation or adjustment lag. Simultaneously, by identifying and controlling the CO2 concentration generated by grain respiration, the accumulation of CO2 and water vapor within the silo can be effectively suppressed, improving the internal gas environment of the grain pile and reducing the risk of grain mold and quality deterioration. The overall solution has a simple structure, high integration, and strong adaptability, which can significantly improve the storage safety, operational stability, and intelligent management level of high-airtightness grain silos.

[0061] Grain storage air conditioning equipment is a specialized device for controlling the storage environment of grain. It is primarily used in high-airtightness, modern grain warehouses to comprehensively regulate temperature, humidity, and gaseous conditions within the warehouse, thereby ensuring grain quality and storage safety. Unlike ordinary civilian or industrial air conditioners, grain storage air conditioning equipment is designed not primarily for personnel comfort, but rather to maintain suitable environmental conditions for grain storage over the long term, preventing problems such as mold, pests, and quality deterioration caused by temperature fluctuations, abnormal humidity, or changes in gas composition.

[0062] Structurally, grain silo air conditioning equipment typically includes an evaporation system, a condensation system, and supply and return air ducts. The evaporation system is used to cool and dehumidify the air, the condensation system is responsible for the stable operation of the refrigeration cycle, and the supply and return air ducts are used to achieve heat exchange and circulation of the air inside the silo. When the equipment is running, the air inside the silo enters the evaporation chamber through the return air duct, completes the heat exchange process, and is then returned to the silo through the supply air duct, thus forming a closed or semi-closed air circulation system.

[0063] As grain silos evolve towards higher airtightness, the functions of grain silo air conditioning equipment have expanded from simple temperature and humidity regulation to include gas environment control and pressure management. On the one hand, the equipment needs to maintain a slight positive pressure inside the silo under sealed conditions to prevent the infiltration of external humid air and pollutants; on the other hand, it also needs to take into account CO2 and water vapor generated by grain respiration, as well as air volume changes caused by grain handling. Therefore, modern grain silo air conditioning equipment often incorporates sensors, automatic control systems, and adjustable air valves to achieve intelligent adjustment of airflow, direction, and operating modes.

[0064] Overall, grain storage air conditioning equipment is a key basic piece of equipment in modern grain storage systems. Its performance directly affects the grain storage cycle, quality and safety, and storage operating costs, and plays an important role in smart grain depots and green grain storage systems.

[0065] In the operation of grain warehouses, mechanized operations refer to various activities involving the loading, unloading, transportation, sorting, and management of grain using specialized machinery and equipment. These operations are a crucial component of grain storage operations. Mechanized operations are present throughout the entire process of grain entering the warehouse, in-warehouse management, and leaving the warehouse, and their operational status directly affects the distribution of materials, airflow, and changes in pressure and gas environment within the warehouse.

[0066] During grain loading operations, grain is typically transported continuously into the silo via belt conveyors, bucket elevators, screw conveyors, or pneumatic conveying devices. As grain continuously enters the silo, the effective free space inside gradually decreases. During the grain's descent and accumulation, it carries a certain amount of air into the silo, leading to an increase in the volume and pressure of the gas inside. Simultaneously, changes in the grain pile structure also affect the air passages and gas exchange conditions within the silo.

[0067] During grain unloading operations, gate discharge, screw conveyor, or suction equipment are commonly used to discharge grain from the silo. Reduced grain volume increases the effective space inside the silo, and as the grain pile sinks, it draws in surrounding air, causing a drop in pressure inside the silo. If air is not replenished in time, outside air can easily seep in through gaps, bringing in moisture or contaminants.

[0068] In addition, grain storage machinery operations include turning over, leveling, and transferring grain. These operations disturb the grain pile structure, alter the airflow path within the storage area, and cause fluctuations in pressure, temperature, and gas composition within a short period. Therefore, in modern grain storage management, the status of machinery operations is typically monitored in real time as a crucial operating parameter and is linked to the environmental control system. This allows for timely and appropriate adjustments to the pressure and gas environment within the storage area during operations, ensuring grain storage safety and equipment operational stability.

[0069] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0070] Although this document uses a number of technical terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention. The order of actions, steps, etc., in the apparatus and methods shown in the specification and drawings can be implemented in any order unless a specific order is explicitly specified, and as long as the output of a preceding process is not used in a subsequent process. Similar sequential terms used for descriptive convenience (e.g., "firstly," "next," "secondly," "again," "then," etc.) do not imply that the actions must be performed in such an order.

[0071] Those skilled in the art will understand that all directional references (e.g., above, below, up, up, down, down, top, bottom, left, right, vertical, horizontal, etc.) are used descriptively in the drawings to aid the reader's understanding and do not imply (e.g., a limitation on the scope of the invention as defined by the appended claims) a limitation on the scope of the invention as defined by the appended claims. They are merely for the purpose of facilitating the description of the application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation. The directional terms "inside" and "outside" refer to inside or outside relative to the outline of the respective components themselves.

[0072] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0073] Additionally, some vague terms (e.g., substantially, certain, generally, etc.) may refer to slight inaccuracies or minor deviations in conditions, quantities, values, or dimensions, some of which are within manufacturing tolerances or limits. It should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components; unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

Claims

1. A grain silo pressure control device, characterized in that, include: An evaporation chamber is provided with an evaporator and an evaporation fan. Air supply duct assembly and return duct assembly for connecting the evaporation chamber and the grain silo; Multiple air valves are respectively installed in the supply air duct assembly and the return air duct assembly; The control unit is electrically connected to the pressure sensor, temperature sensor, CO2 concentration sensor, and each of the aforementioned air valves.

2. The grain silo pressure control device according to claim 1, characterized in that, The air supply duct assembly includes a first air supply duct and a second air supply duct. The first air supply duct connects the evaporation chamber to the grain silo, and the second air supply duct connects the first air supply duct to the atmosphere. A second air valve is provided inside the first air supply duct, and a first air valve is provided inside the second air supply duct.

3. The grain silo pressure control device according to claim 1, characterized in that, The return air duct assembly includes a first return air duct and a second return air duct. The first return air duct connects the evaporation chamber to the grain silo, and the second return air duct connects the first return air duct to the atmosphere. A third air valve is provided in the first return air duct, and a fourth air valve is provided in the second return air duct.

4. The grain silo pressure control device according to claim 1, characterized in that, The air valve is a flow control valve with adjustable opening.

5. The grain silo pressure control device according to claim 1, characterized in that, Both the supply air duct assembly and the return air duct assembly are equipped with flow detection units to feed back air volume data to the control unit, thereby achieving closed-loop control of pressure and temperature regulation.

6. The grain silo pressure control device according to claim 2, characterized in that, The second air supply duct connects to the upper part of the middle section of the first air supply duct.

7. The grain silo pressure control device according to claim 6, characterized in that, The port of the second air supply duct that connects to the atmosphere is bent downwards.

8. The grain silo pressure control device according to claim 3, characterized in that, The second return air duct connects to the upper part of the middle section of the first return air duct.

9. The grain silo pressure control device according to claim 8, characterized in that, The port of the second return air duct that connects to the atmosphere is bent downwards.

10. The grain silo pressure control device according to claim 1, characterized in that, It also includes a condenser, which is located in the same housing as the evaporator, and the condenser is located below the evaporator.

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