Anti-condensation inner-circulation automatic ventilation system and method for granary

Abstract

This application relates to the field of grain storage and temperature control technology, and particularly to an anti-condensation internal circulation automatic ventilation system and method for grain silos. The ventilation system includes a floor cage, an internal circulation duct, side wall ducts, and a circulation fan. The floor cage is located at the bottom of the grain silo, below the grain pile, enabling air circulation between the floor cage and the grain pile. The internal circulation duct is located on the top of the silo, with multiple internal circulation vents. The side wall ducts are located in the silo walls, with their lower ends connected to the floor cage and their upper ends connected to the internal circulation ducts. The circulation fan is installed on the internal circulation ducts. The side walls of the grain silo also have a first embedded vent and a second embedded vent that communicate with the external environment. The first embedded vent is connected to the bottom of the side wall duct, and the second embedded vent is connected to the internal circulation duct. The ventilation system provided by this application integrates three modes: cooling, exhaust, and cold storage. The controller automatically switches modes according to temperature and humidity, ensuring precise temperature control and energy efficiency.

Description

Technical Field

[0001] This application relates to the field of grain storage and temperature control technology, and in particular to an anti-condensation internal circulation automatic ventilation system and method for grain warehouses. Background Technology

[0002] Temperature and moisture are critical factors in grain storage. Excessive temperature intensifies respiration, leading to overheating, mold, and pests; excessive moisture easily causes mold and condensation, while insufficient moisture reduces quality and causes weight loss. Therefore, effective control of temperature and humidity in grain piles is essential to ensure safe storage.

[0003] During the hot summer months, grain silos typically employ ceiling-mounted internal circulation cooling and ventilation systems to lower grain temperatures. This system uses circulating fans to circulate air within the grain pile. As the air passes through the grain core, it exchanges heat with the cold grain and is cooled. The cooled air then enters the air ducts through floor ducts and is delivered to the grain surface area via ceiling ducts. It is then blown onto the grain surface from ceiling vents and re-enters the grain pile, thus creating air circulation and achieving the goal of lowering grain temperature by utilizing the cool core of the grain pile. However, existing grain silo internal circulation systems often use a method where the fan outlet directly faces the silo space, drawing cold air from the bottom of the grain and then delivering it to the space above the grain surface. On one hand, direct contact between the cold air and the grain surface can cause excessively rapid cooling in certain areas, resulting in uneven temperature distribution, moisture loss, and weight loss. On the other hand, hot air can be forced into the grain layer, creating a "cold-hot clash" with the cold core inside the grain, which can lead to condensation and negatively impact grain quality. Therefore, the existing internal circulation cooling and ventilation methods still have certain limitations in practical applications. Summary of the Invention

[0004] This application provides an anti-condensation internal circulation automatic ventilation system and method for grain warehouses, which solves the problem in the existing grain warehouse internal circulation ventilation system that cold air blows directly into the lower space of the grain warehouse, which easily causes moisture loss and condensation on the grain surface. The system aims to achieve reasonable organization and flow of cold air during the cooling process of the grain warehouse, avoid cold air directly acting on the grain surface, reduce condensation on the grain surface, and improve the safety of grain storage.

[0005] On the one hand, this application provides an anti-condensation internal circulation automatic ventilation system for grain warehouses, comprising: Ground cages are installed at the bottom of the grain silo, below the grain pile, and allow for air circulation between the ground cage and the grain pile. An internal circulation air duct is installed on the top of the warehouse, and multiple internal circulation air outlets are opened on the internal circulation air duct. Side wall air ducts are installed in the warehouse wall. The lower end of the side wall air duct is connected to the floor cage, and the upper end is connected to the inner circulation air duct. Circulation fan, the circulation fan is installed on the internal circulation duct; The side wall of the grain warehouse is also equipped with a first embedded air vent and a second embedded air vent that connects to the external environment. The first embedded air vent is connected to the bottom of the side wall air duct, and the second embedded air vent is connected to the inner circulation air duct.

[0006] In one possible design, the ventilation system also includes a mixing box, which is installed above the grain pile in the side wall duct. The mixing box has an air inlet, an air outlet, and a mixing port. The air inlet and air outlet are connected to the side wall duct, and the mixing port is connected to the internal space of the grain silo through a bypass pipe.

[0007] In one possible design, the first wall-mounted air vent, the second wall-mounted air vent, the air inlet, the air outlet, the mixing air vent, and each internal circulation air vent are each equipped with an air valve.

[0008] In one possible design, the ventilation system also includes a controller and multiple temperature and humidity sensors. The internal space of the grain silo is divided into multiple independent control zones, each zone is equipped with a corresponding temperature and humidity sensor, the temperature and humidity sensors are connected to the controller via temperature measuring cables, and the air valves are connected to the controller via control cables. The controller controls the opening and closing status and opening degree of the air valves based on the detection data of the temperature and humidity sensors.

[0009] In one possible design, the ventilation system also includes a portable fan installed at the first wall-mounted air vent to introduce gases from the external environment into the grain silo through side wall ducts or floor cages.

[0010] In one possible design, the inner circulation vent is opened towards the top of the silo, and the airflow blown out from the inner circulation vent first flows towards the top of the silo and then settles towards the grain pile.

[0011] In one possible design, the mixing box is equipped with a turbulence structure to enhance the airflow mixing effect.

[0012] On the other hand, this application also provides an automatic internal circulation ventilation method for grain storage to prevent condensation. Based on the above-mentioned automatic internal circulation ventilation system for grain storage to prevent condensation, the ventilation method includes: Collect the dry bulb temperature, dew point temperature, and supply air temperature of the air inside the chamber; When the dry bulb temperature of the air inside the chamber is higher than the preset threshold, switch to cooling mode and start the circulating fan to make the air circulate along the floor cage, side wall air duct, mixing box, inner circulating air duct, inner circulating air outlet and the top space of the chamber, and deliver the cooling air to the top space of the chamber. During the air supply process, when the supply air temperature before entering the mixing box is lower than the dew point temperature of the air inside the chamber, the air valve corresponding to the bypass pipe is opened to introduce hot and humid air from the upper part of the chamber into the mixing box to mix with the cold air. The mixing ratio is adjusted so that the temperature of the supplied mixed air is higher than the dew point temperature and lower than the dry bulb temperature inside the chamber. When the temperature inside the chamber is higher than the outdoor temperature, switch to exhaust mode, change the direction of the circulating fan, exhaust the hot air inside the chamber and introduce fresh outdoor air. When the outdoor temperature meets the cold storage conditions in winter, switch to cold storage mode and use the low outdoor air to carry out bottom-up ventilation and cold storage.

[0013] In one possible design, in exhaust mode, the air inlet and mixing port of the mixing box are opened, the air outlet of the mixing box is closed, the direction of the circulating fan is changed, and the air inside the chamber is exhausted to the outside through the inner circulating air outlet, the inner circulating air duct and the second wall-mounted air outlet. Outdoor fresh air is introduced into the chamber through the first wall-mounted air outlet, the mixing box and the bypass pipe.

[0014] In one possible design, in cold storage mode, the air inlet, air outlet and mixing port of the mixing box are closed. The low-temperature outdoor air enters the bottom of the grain silo through the first wall-mounted air inlet and the ground cage and flows from bottom to top. After exchanging heat with the grain pile, it is discharged outdoors through the inner circulation air inlet, the inner circulation duct and the second wall-mounted air inlet.

[0015] The beneficial effects of this application are as follows: The grain storage anti-condensation internal circulation automatic ventilation system of this application optimizes the airflow organization within the storage facility, enabling air to circulate along the grain pile—floor cage—side wall duct—top space, avoiding direct airflow onto the grain surface, which helps reduce the local temperature gradient on the grain surface and thus reduces the risk of moisture loss from the grain surface.

[0016] The grain storage anti-condensation internal circulation automatic ventilation system of this application, by setting up a mixing box and bypass pipe structure, actively introduces hot and humid air above the grain surface into the mixing box through the bypass pipe to participate in the mixing, avoiding the hot and humid air being forced into the grain layer and coming into contact with the low-temperature grain pile, thereby effectively preventing condensation inside the grain layer and improving the safety of grain storage.

[0017] The grain silo anti-condensation internal circulation automatic ventilation system of this application adopts a ceiling-free structure, arranges the internal circulation duct in the silo ceiling space and fixes it in various ways. The structure is simple and flexible to install, and it is suitable for the renovation of existing grain silos and the application of new grain silos, which helps to reduce project costs.

[0018] The grain storage anti-condensation internal circulation automatic ventilation method provided in this application integrates three modes: refrigeration, exhaust, and cold storage. The controller automatically switches according to temperature and humidity, ensuring precise temperature control and energy efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic plan view of an anti-condensation internal circulation automatic ventilation system for grain storage provided in this application embodiment; Figure 2 for Figure 1 Schematic diagram of the summer cooling operation principle of the internal circulation system in the middle aa; Figure 3 for Figure 1 Schematic diagram of the summer exhaust operation principle of the internal circulation system in the middle AA; Figure 4 for Figure 1 Schematic diagram of the winter cold storage operation principle of the internal circulation system in the middle aa.

[0021] Figure label: 1. Grain pile; 2. Ground cage; 4a. First wall-mounted air vent; 4b. Second wall-mounted air vent; 6. Side wall air duct; 7. Mixing box; 8. Bypass pipe; 9. Circulating fan; 10. Internal circulating air duct; 11. Warehouse roof; 13. Warehouse wall; 14. Controller; 15. Temperature measuring cable; 16. Control cable; 17. Portable fan. Detailed Implementation

[0022] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The following is combined Figures 1-4 This application describes the anti-condensation internal circulation automatic ventilation system for grain warehouses provided in the embodiments of this application.

[0024] Reference Figure 1 As shown, the ventilation system divides the internal space of the grain silo into multiple independent control units. Three zones (A, B, and C) are set along the longitudinal direction, and six zones (① to ⑥) are set along the transverse direction, intersecting to form several independent control zones. Different zones correspond to different air supply terminals, achieving zoned temperature regulation within the silo.

[0025] Specifically, the ventilation system includes a ground cage 2, an internal circulation duct, a side wall duct 6, a mixing box 7, and a circulation fan 9. The ground cage 2 is located at the bottom of the grain silo, below the grain pile 1, enabling air circulation between them. The bottom of the grain pile 1 serves as the air intake and intake channel, fully utilizing the cold source of the grain pile 1 to achieve efficient heat exchange between the air and the grain pile 1, providing a basis for internal circulation cooling. The internal circulation duct is located on the silo roof 11, eliminating the need for a suspended ceiling structure. It is installed on the silo roof 11 or silo wall 13 structure using steel frames, hangers, brackets, or other fixing methods. Multiple internal circulation air outlets are provided on the internal circulation duct. For ease of description, Figure 1 Along direction aa, the inner circulation air vents are arranged in sequence as follows: inner circulation air vent 12A, inner circulation air vent 12B, and inner circulation air vent 12C. The inner circulation air vents are U-shaped air vents, and their number and arrangement can be adjusted according to the size of the grain silo, and can be evenly distributed or zoned.

[0026] The inner circulation vent faces the top of the silo 11. The airflow from the inner circulation vent first flows towards the top of the silo 11 and then settles towards the grain pile 1. By adopting an upward airflow and natural settling method, cold air is prevented from blowing directly onto the grain surface, reducing moisture loss from the grain surface and ensuring grain quality. The circulation fan 9 can be an axial flow fan, a centrifugal fan, or a mixed flow fan.

[0027] The side wall air duct 6 is located inside or outside the warehouse wall 13, preferably inside the warehouse wall 13, but it can also be located outside the warehouse wall 13 provided that the insulation measures are good. The lower end of the side wall air duct 6 is connected to the floor cage 2, and the upper end is connected to the inner circulation air duct, forming a stable vertical airflow delivery channel. The circulation fan 9 is installed on the inner circulation air duct and is arranged in the area of ​​the warehouse roof 11. The circulation fan 9 can switch between forward and reverse rotation, and can quickly realize the conversion between cooling mode, exhaust mode and cold storage mode.

[0028] The side wall of the grain silo is also equipped with a first recessed air vent 4a and a second recessed air vent 4b that connect to the external environment. The first recessed air vent 4a is connected to the side wall air duct 6. Preferably, the first recessed air vent 4a is located at the connection between the side wall air duct 6 and the floor cage 2. The second recessed air vent 4b is connected to the internal circulation air duct. The first recessed air vent 4a and the second recessed air vent 4b enable indoor and outdoor air exchange, providing air inlet and outlet channels for summer exhaust mode and winter cold storage mode.

[0029] The mixing air box 7 is installed above the grain pile 1 in the side wall air duct 6. The mixing air box 7 has an air inlet, an air outlet, and a mixing air inlet. The air inlet and outlet are connected to the side wall air duct 6, and the mixing air inlet is connected to the internal space of the grain silo via a bypass pipe 8. The number and connection position of the bypass pipes 8 can be adjusted according to actual working conditions to achieve different levels of air mixing regulation. Through the mixing air box 7, hot and humid air from the upper part of the silo can be actively introduced and mixed with cold air, preventing hot and humid air from contacting the grain surface, and adjusting the air supply temperature in real time to prevent condensation from the source.

[0030] In some embodiments, the mixing chamber 7 is provided with a turbulence structure, such as a turbulence vane, to enhance the airflow mixing effect. This improves the uniformity of hot and cold air mixing, ensures stable supply air temperature, and prevents condensation when cold air meets hot and humid air in the chamber due to excessively low supply air temperature.

[0031] Each of the first recessed wall air vent 4a, the second recessed wall air vent 4b, the air inlet, the air outlet, the mixing air vent, and each internal circulation air vent is equipped with a damper, which, for ease of description, are designated as damper 3a, damper 3b, damper 3c, damper 3d, damper 3e, damper 3f, damper 3g, and damper 3h, respectively. By independently configuring dampers at each airflow node, airflow interruption, air volume distribution, and airflow direction can be precisely controlled to meet the needs of multi-mode switching. The dampers can be electrically regulating valves, manual valves, or automatic control valves. Each damper is equipped with a corresponding temperature and humidity sensor, which, for ease of description, are designated as temperature and humidity sensor 5a, temperature and humidity sensor 5b, temperature and humidity sensor 5c, temperature and humidity sensor 5d, temperature and humidity sensor 5e, temperature and humidity sensor 5f, temperature and humidity sensor 5g, and temperature and humidity sensor 5h, respectively.

[0032] The grain silo's interior space is divided into multiple independent control zones, each equipped with a temperature and humidity sensor. These sensors are connected to a controller 14 via a temperature measuring cable 15, and air valves are connected to the controller 14 via a control cable 16. The controller 14 controls the opening and closing status and degree of the air valves based on the data from the temperature and humidity sensors. Through zoned monitoring and automatic control, uniform temperature and humidity control within the silo is achieved, preventing localized overheating or overcooling and improving temperature control accuracy.

[0033] In some embodiments, the ventilation system further includes a mobile fan 17, which is installed at the first wall-mounted air inlet 4a to introduce air from the outside environment into the grain silo through the side wall duct 6 or the floor cage 2. By equipping the mobile fan 17, winter air intake is enhanced, natural cold sources are fully utilized, mechanical refrigeration energy consumption is reduced, and low-cost cold storage is achieved.

[0034] The anti-condensation internal circulation automatic ventilation system for grain silos proposed in this application has three modes: cooling mode, exhaust mode, and cold storage mode. The operating principles of the three modes are explained in detail below: Cooling mode: Reference Figure 2As shown, during summer operation, when the dry-bulb temperature of the air inside the silo, measured by temperature and humidity sensors 5f, 5g, and 5h, is 18°C ​​higher than the designed temperature of the grain surface, the controller 14 issues a command according to the preset control strategy to start the internal circulation fan 9 and open the air valves 3b, 3d, 3f, 3g, and 3h. After the circulation fan 9 starts, it draws out the cold air from the bottom cage 2 of the grain pile 1 and delivers it to the mixing box 7 through the side wall air duct 6. Subsequently, the cold air enters the internal circulation duct 10 under the drive of the internal circulation fan 9 and is delivered into the space above the silo 11 through the internal circulation return air inlets 12A, 12B, and 12C located on the silo top 11 in an upward airflow manner, achieving a cooling effect. Due to its higher density, the cold air first accumulates in the area above the silo 11 and then slowly settles, gradually pressing the hot air in the upper part of the silo down to the grain surface area, thereby preventing the cold air from blowing directly onto the grain surface and reducing moisture loss from the grain surface. During this operational phase, the system operates in a pure internal circulation cooling mode, where the air inside the silo circulates in a closed loop, enabling continuous heat exchange between the grain pile 1 and the air, thereby gradually reducing the overall temperature inside the silo.

[0035] If the temperature and humidity sensor 5b detects that the supply air temperature before entering the mixing box 7 is lower than the dew point temperature corresponding to the air conditions measured by the temperature and humidity sensors 5f, 5g, and 5h, it indicates that there is a risk of condensation in the top space of the silo under the existing air supply conditions. At this time, the controller 14 issues a command to open the air valve 3c, allowing some of the uncooled hot air in the silo to be introduced into the mixing box 7 through the bypass pipe 8, and mixed with the low-temperature air cooled by the grain pile 1 in the mixing box 7. The method of introducing hot and humid air from the silo into the mixing box 7 to mix with the cold air can effectively prevent the hot and humid air from being completely forced into the grain layer and causing condensation. By adjusting the opening ratio of the air valve 3c and the air valve 3b, the mixing ratio of hot and cold air in the mixing box 7 is dynamically controlled, thereby precisely adjusting the supply air temperature at the return air inlets 12A, 12B, and 12C, so that it always meets the following control requirements: the supply air temperature is lower than the dry bulb temperature of the hot air in the silo to ensure the cooling effect; at the same time, it is higher than the dew point temperature of the air in the silo to avoid condensation in the silo. The above control method can effectively reduce the risk of condensation in the grain silo while achieving effective cooling, thus ensuring the safety of grain storage. When the grain surface temperature drops to the set target value, the controller 14 issues a stop command, sequentially shutting down the internal circulation fan 9 and related air valves, stopping the system and completing this stage of the control process.

[0036] Ventilation mode: Reference Figure 3As shown, during summer operation, due to the heat storage effect of the grain silo enclosure structure and the influence of solar radiation, the outer walls and roof of the silo absorb heat and transfer it into the silo, which may cause the air temperature inside the silo to be higher than the outdoor ambient temperature. Under these circumstances, if ventilation is not carried out in time, heat will easily accumulate inside the silo, thereby affecting the safety of grain storage. When the air temperature inside the silo measured by temperature and humidity sensors 5f, 5g, and 5h is higher than the outdoor air temperature measured by temperature sensor 5e at the wall-mounted air vent, it indicates that the temperature inside the silo is higher than the outdoor ambient temperature, and conditions are available for cooling using natural air. At this time, the controller 14 issues a command to start the exhaust ventilation operation mode. In this operation mode, air valves 3a, 3b, 3c, 3e, and 3h are opened, and the internal circulation fan 9 is started and its direction is changed, while the remaining air valves remain closed. The air inside the storage silo first enters the inner circulation duct 10 through the inner circulation return air inlet 12A. Under the action of the inner circulation fan 9, it is discharged to the outside through the air valve 3e at the second embedded wall air outlet 4b, thus creating a certain negative pressure inside the silo. Under the action of negative pressure, outdoor air enters the system through the first embedded wall air outlet 4a and is transported along the side wall duct 6, entering the mixing box 7 through the air valve 3b. Since the air valve 3d at the outlet of the mixing box 7 is in the closed state, the air entering the mixing box 7 cannot enter the conventional air supply channel. It can only enter the silo through the bypass pipe 8 and the open air valve 3c, replacing the original air inside the silo, thus realizing the continuous discharge of hot air inside the silo and the introduction of outside air. Through the above airflow organization, the overall air renewal and temperature reduction inside the silo are achieved without directly acting on the grain surface, thereby effectively removing the accumulated heat inside the silo and improving the grain storage environment. When the temperature inside the silo gradually decreases and approaches the outdoor ambient temperature, the controller 14 issues a stop command, shutting down the inner circulation fan 9 and related air valves, and the system stops operating.

[0037] Cooling mode: Reference Figure 4As shown, during winter operation, a mobile fan 17 is installed at the first wall-mounted vent 4a. The controller 14 issues commands according to the winter operation strategy, closing air valves 3b, 3c, and 3d, and opening air valves 3a, 3e, 3f, 3g, and 3h. Simultaneously, the internal circulation fan 9 and the mobile fan 17 are started, and the system enters the winter ventilation and cooling operation mode. In this mode, the low-temperature outdoor air is used as a natural cold source. The mobile fan 17 introduces the low-temperature outdoor air into the system through the first wall-mounted vent 4a and delivers it to the ground cage 2 through the opened air valve 3a. The low-temperature air then enters the bottom of the grain pile 1 through the ground cage 2 and flows upwards along the pores of the grain pile 1, undergoing sufficient convective heat exchange with the grain during its passage through the grain pile 1, thereby achieving overall cooling of the grain pile 1. After heat exchange in the grain pile 1, the air temperature rises and then enters the silo space. It is collected by the inner circulation return air vents 12A, 12B, and 12C located on the silo roof 11 and transported to the inner circulation fan 9 via the inner circulation duct 10. Under the action of the fan, the air is finally exhausted to the outside through the second wall-mounted air vent 4b, thus forming a unidirectional open airflow path of "outdoor air intake—grain heat exchange—indoor collection—outdoor exhaust," achieving continuous cooling of the grain pile 1. During operation, the temperature at different heights of the grain pile 1 is monitored in real time by temperature sensors 5a located at the bottom of the side walls and temperature sensors 5e located at the top of the side walls. When the temperature difference measured by temperature sensors 5a and 5e gradually decreases and stabilizes within a range of approximately 2°C, it indicates that the internal temperature distribution of the grain pile 1 is becoming more uniform, and the overall temperature is basically close to the outdoor ambient temperature, indicating that the cooling process of the grain pile 1 has achieved the expected effect. At this point, controller 14 issues a stop command, sequentially shutting down the mobile fan 17, the internal circulation fan 9, and all relevant air valves (3a, 3e, 3f, 3g), thus stopping the system and completing the winter cooling process. Through this operating mode, the natural cold source in winter is fully utilized for through-flow cooling of the grain pile 1, which not only reduces mechanical refrigeration energy consumption but also improves the uniformity of the temperature field in the grain pile 1.

[0038] This application also provides an automatic internal circulation ventilation method for grain storage to prevent condensation, based on the ventilation system in the above embodiments, the ventilation method including: Collect the dry-bulb temperature, dew point temperature, and supply air temperature inside the chamber to obtain core temperature control parameters, providing accurate data for automatic control.

[0039] When the dry-bulb temperature of the air inside the silo exceeds the preset threshold, the cooling mode is switched. In cooling mode, the air inlet and outlet of the mixing box 7 are opened, and the circulating fan 9 is started, so that the air circulates along the ground cage 2, the side wall air duct 6, the mixing box 7, the inner circulating air duct, the inner circulating air outlet, and the space of the silo roof 11, delivering the cooling air to the space of the silo roof 11 to form a closed inner circulation, continuously using the cold source of the grain pile 1 to cool down, and the temperature inside the silo drops steadily.

[0040] During the air supply process, when the supply air temperature before entering the mixing box 7 is lower than the dew point temperature of the air inside the chamber, the mixing port of the mixing box 7 is opened to introduce hot and humid air from the upper part of the chamber into the mixing box 7 to mix with the cold air. The mixing ratio is adjusted so that the temperature of the supplied mixed air is higher than the dew point temperature and lower than the dry bulb temperature inside the chamber, thereby achieving active air mixing and temperature regulation. While ensuring the cooling effect, condensation inside the chamber is completely avoided.

[0041] When the temperature inside the storage silo is higher than the outdoor temperature, the system switches to exhaust mode. Specifically, in exhaust mode, the air inlet and outlet of the mixing box 7 are opened, the air outlet of the mixing box 7 is closed, and the direction of the circulating fan 9 is changed. Air inside the silo is exhausted outdoors through the inner circulating air outlet, inner circulating air duct, and the second wall-mounted air outlet 4b. Fresh outdoor air is introduced into the silo through the first wall-mounted air outlet 4a, the mixing box 7, and the bypass pipe 8. This utilizes the outdoor natural cooling source to assist in cooling, reducing fan energy consumption and quickly removing accumulated heat from the silo. This exhaust path has a clear airflow path, high ventilation efficiency, and avoids direct airflow onto the grain surface, ensuring grain storage safety.

[0042] When the outdoor temperature meets the cold storage requirements in winter, the system switches to cold storage mode. Specifically, in cold storage mode, the air inlet, outlet, and mixing inlet of the mixing box 7 are closed. Low-temperature outdoor air enters the bottom of the grain silo through the first embedded wall vent 4a and the ground cage 2, flowing upwards. After exchanging heat with the grain pile 1, it is discharged outdoors through the inner circulation vent, the inner circulation duct, and the second embedded wall vent 4b. By utilizing the low-temperature outdoor air for bottom-to-top through-flow ventilation and cold storage, the system fully utilizes the low-temperature cold storage in winter to reserve cold energy for summer grain storage. The grain pile 1 cools down evenly, with good cold storage effect, which can significantly improve the overall stability of the grain pile 1 and greatly reduce the annual operating cost.

[0043] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A grain silo anti-condensation internal circulation automatic ventilation system, characterized in that, include: A ground cage, which is installed at the bottom of the grain silo, below the grain pile, and is able to create gas circulation between itself and the grain pile; An internal circulation air duct is installed on the top of the warehouse, and multiple internal circulation air outlets are provided on the internal circulation air duct; Side wall air duct, the side wall air duct is set in the warehouse wall, the lower end of the side wall air duct is connected to the ground cage, and the upper end is connected to the inner circulation air duct; A circulating fan, wherein the circulating fan is installed on the inner circulating air duct; The side wall of the grain warehouse is also provided with a first embedded air vent and a second embedded air vent that communicate with the external environment. The first embedded air vent is connected to the side wall air duct, and the second embedded air vent is connected to the inner circulation air duct.

2. The anti-condensation internal circulation automatic ventilation system for grain silos according to claim 1, characterized in that, It also includes a mixing air box, which is installed on the side wall air duct above the grain pile. The mixing air box has an air inlet, an air outlet and a mixing air inlet. The air inlet and the air outlet are respectively connected to the side wall air duct, and the mixing air inlet is connected to the internal space of the grain silo through a bypass pipe.

3. The anti-condensation internal circulation automatic ventilation system for grain silos according to claim 2, characterized in that, Each of the first wall-mounted air vent, the second wall-mounted air vent, the air inlet, the air outlet, the mixing air vent, and each of the inner circulation air vents is equipped with an air valve.

4. The anti-condensation internal circulation automatic ventilation system for grain silos according to claim 3, characterized in that, It also includes a controller and multiple temperature and humidity sensors. The internal space of the grain silo is divided into multiple independent control zones, and each zone is equipped with a corresponding temperature and humidity sensor. The temperature and humidity sensors are connected to the controller via temperature measuring cables, and the air valves are connected to the controller via control cables. The controller controls the opening and closing status and opening degree of the air valves based on the detection data of the temperature and humidity sensors.

5. The anti-condensation internal circulation automatic ventilation system for grain silos according to claim 4, characterized in that, It also includes a mobile fan, which is installed at the first wall-mounted air vent and is used to introduce gas from the external environment into the grain silo through the side wall duct or the ground cage.

6. The anti-condensation internal circulation automatic ventilation system for grain silos according to any one of claims 1-5, characterized in that, The inner circulation vent is opened towards the top of the silo, and the airflow blown out from the inner circulation vent first flows towards the top of the silo and then settles towards the grain pile.

7. The anti-condensation internal circulation automatic ventilation system for grain silos according to claim 2, characterized in that, The mixing box is equipped with a turbulence structure to enhance the airflow mixing effect.

8. A method for automatic internal circulation ventilation to prevent condensation in grain warehouses, characterized in that, Based on the grain storage anti-condensation internal circulation automatic ventilation system according to any one of claims 1-7, the method includes: Collect the dry bulb temperature, dew point temperature, and supply air temperature of the air inside the chamber; When the dry bulb temperature of the air inside the chamber is higher than the preset threshold, switch to cooling mode and start the circulating fan to make the air circulate along the floor cage, side wall air duct, mixing box, inner circulating air duct, inner circulating air outlet and the top space of the chamber, and deliver the cooling air to the top space of the chamber. During the air supply process, when the supply air temperature before entering the mixing box is lower than the dew point temperature of the air inside the chamber, the air valve corresponding to the bypass pipe is opened to introduce hot and humid air from the upper part of the chamber into the mixing box to mix with the cold air. The mixing ratio is adjusted so that the temperature of the supplied mixed air is higher than the dew point temperature and lower than the dry bulb temperature inside the chamber. When the temperature inside the chamber is higher than the outdoor temperature, switch to exhaust mode, change the direction of the circulating fan, exhaust the hot air inside the chamber and introduce fresh outdoor air. When the outdoor temperature meets the cold storage conditions in winter, switch to cold storage mode and use the low outdoor air to carry out bottom-up ventilation and cold storage.

9. The automatic internal circulation ventilation method for grain silos to prevent condensation according to claim 7, characterized in that, In exhaust mode, the air inlet and mixing port of the mixing box are opened, the air outlet of the mixing box is closed, and the direction of the circulating fan is changed. The air in the chamber is discharged to the outside through the inner circulating air port, the inner circulating air duct and the second wall-mounted air port. Outdoor fresh air is introduced into the chamber through the first wall-mounted air port, the mixing box and the bypass pipe.

10. The automatic internal circulation ventilation method for preventing condensation in grain silos according to claim 7, characterized in that, In cold storage mode, the air inlet, air outlet and air mixing port of the mixing box are closed. The low-temperature outdoor air enters the bottom of the grain silo through the first wall-mounted air inlet and the ground cage and flows from bottom to top. After exchanging heat with the grain pile, it is discharged outdoors through the inner circulation air inlet, the inner circulation air duct and the second wall-mounted air inlet.

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