Smart temperature and humidity control system for inside a grain warehouse and its operating method

Abstract

The system includes a warehouse body, ventilation pipes, a ventilation cage set, a return pipe, an air conditioning unit, a humidity control device, and a control module. The humidity control device, a single-stage ventilation pipe, a double-stage ventilation pipe, and a triple-stage ventilation pipe are connected in sequence. The double-stage ventilation pipe is located at the top of the warehouse body and has a first fan that is movable along the axial direction inside. A ventilation cage set is located at the bottom of the warehouse body, and the ventilation cage set is connected to the air conditioning unit via a return pipe and a second fan. The air conditioning unit is connected to the humidity control device. Multiple triple-stage ventilation pipes, which are extendable vertically, are further connected to the double-stage ventilation pipe. Ventilation holes are provided in the pipe walls of the triple-stage ventilation pipes, and temperature and humidity sensors with variable height positions are installed inside the pipes. The triple-stage ventilation pipes are inserted into the grain stacks to monitor the temperature and humidity of the grain stacks. [Effect] This system enables rapid adjustment to abnormal temperature and humidity zones inside grain warehouses, achieving smart control of internal temperature and humidity in grain stacks.

Description

Technical Field

[0001] The present invention relates to a temperature and humidity control system for a grain warehouse and an operation method thereof.

Background Art

[0002] The temperature and humidity in a grain warehouse are important factors affecting grain storage quality. In conventional grain warehouse temperature and humidity control technologies, usually, a temperature monitoring device is provided inside the grain stack, a humidity monitoring device is provided on the top of the grain stack, and the temperature and humidity inside the warehouse body are adjusted by methods such as mechanical ventilation.

[0003] Chinese Patent with Publication Number CN217241539U discloses a spiral grain warehouse temperature and humidity automatic control system. This system includes a grain warehouse, a control device, a measuring device, an execution device, etc. In this solution, when the spiral ventilation pipe operates inside the grain stack, ventilation dead corners occur, the temperature and humidity adjustment effect in the local area is poor, and it is easy to cause temperature and humidity abnormalities in the local area.

[0004] Chinese Patent with Publication Number CN221381843U discloses a grain warehouse ventilation device. This device includes a blowing means, a ventilation means and a control means. The ventilation means includes a shunt pipe and a ventilation cage. The shunt pipe is provided with a main flow path, a confluence chamber and a sub-flow path. Each sub-flow path communicates with the confluence chamber. The ventilation cage communicates with the sub-flow path in a one-to-one correspondence. The number of control means is the same as the number of sub-flow paths. The ventilation cage is a shunt-type U-shaped ventilation cage. The airflow formed by this ventilation device is unevenly distributed inside the grain stack, the ventilation effect is poor, and high-temperature dead corners are likely to occur.

Summary of the Invention

Problems to be Solved by the Invention

[0005] In response to the aforementioned shortcomings of the conventional technology, the task of the present invention is to provide an internal smart temperature and humidity control system for grain warehouses and a method for operating the internal smart temperature and humidity control system for grain warehouses in order to solve the problem of uneven, insufficient, and high energy consumption of local temperature and humidity control in grain warehouses. [Means for solving the problem]

[0006] The technical proposal of the present invention is as follows: A smart temperature and humidity control system for the interior of a grain warehouse, comprising a warehouse body, a ventilation pipe, a ventilation cage set, a return pipe, an air conditioning unit, a humidity control device, and a control module, wherein the ventilation pipe comprises a single-stage ventilation pipe, a double-stage ventilation pipe, and a triple-stage ventilation pipe, the outlet end of the humidity control device is connected to the inlet of the single-stage ventilation pipe, the outlet of the single-stage ventilation pipe is connected to the double-stage ventilation pipe, the single-stage ventilation pipe is provided with a first damper that controls the opening and closing of the single-stage ventilation pipe, there are multiple double-stage ventilation pipes provided and arranged at the top of the warehouse body, there are first fans provided inside the double-stage ventilation pipes that are movable along the double-stage ventilation pipe, each of the double-stage ventilation pipes is connected to a plurality of triple-stage ventilation pipes at intervals along the axial direction, the top of the triple-stage ventilation pipe communicates with the double-stage ventilation pipe, and the end of the triple-stage ventilation pipe The three-stage air duct is closed, the three-stage air duct is an expandable pipe with ventilation holes in its side walls, a temperature and humidity sensor whose height position can be adjusted is provided inside the three-stage air duct, the ventilation cage set is uniformly arranged at the bottom of the warehouse body, the ventilation cage set is connected to the inlet of the return air duct via a second fan, the outlet of the return air duct is connected to the inlet end of the air conditioning unit, the air conditioning unit is used to transport the air to the intake end of the humidity control device after temperature adjustment, the humidity control device is used to discharge the air from the outlet end after humidity adjustment, and the control module is electrically connected to the temperature and humidity sensor and is used to control the operation of the first damper, the first fan, the second fan, the three-stage air duct, the air conditioning unit and the humidity control device.

[0007] Furthermore, the opening height of the ventilation holes in the three-stage air vents is not higher than the height of the grain storage lines of the warehouse body.

[0008] Furthermore, a rotating shaft is provided at the top of the three-stage air blower, a control cable is wound around the rotating shaft, the control cable is connected to the temperature and humidity sensor, and the rotating shaft controls the position height of the temperature and humidity sensor when it rotates.

[0009] Furthermore, the two-stage air vents are arranged parallel to the top of the warehouse body at equal intervals, and the three-stage air vents are connected vertically to the two-stage air vents at equal intervals.

[0010] Furthermore, the two-stage air duct is provided with a sliding rail extending in the axial direction, the first fan is slidably mounted on the sliding rail, and a sealing ring is provided in the axial direction of the first fan that fits to seal with the pipe wall of the two-stage air duct.

[0011] Furthermore, the ventilation cage set includes a single-stage ventilation cage, a double-stage ventilation cage, and a triple-stage ventilation cage, the single-stage ventilation cage being positioned on both sides of the warehouse body, the double-stage ventilation cage being connected to the single-stage ventilation cage, the triple-stage ventilation cage being connected to the side of the double-stage ventilation cage via a movable joint, the triple-stage ventilation cage and the double-stage ventilation cage forming a tree branch structure, and the double-stage ventilation cages in the single-stage ventilation cage located on both sides of the warehouse body being provided in parallel and intersecting.

[0012] Furthermore, the humidity control device includes a first branch, a second branch, and a third branch provided in parallel between the intake end and the outlet end, wherein the first branch is provided with a second damper and is directly connected from the intake end to the outlet end, the second branch is provided with a third damper and a dehumidification area, and the third branch is provided with a fourth damper and a shower humidification area.

[0013] Furthermore, the system includes a water storage tank, the drainage from the air conditioning unit is connected to the water storage tank, and the water storage tank provides shower water to the shower humidification area.

[0014] Another technical proposal of the present invention provides a method for operating an internal smart temperature and humidity control system for a grain warehouse, which is performed based on the above-mentioned internal smart temperature and humidity control system for a grain warehouse. The process includes the steps of: after storing the grain in the warehouse body, inserting the three-stage air duct into the grain stack, changing the height of each temperature and humidity sensor, monitoring the temperature and humidity at each preset location within the warehouse body, and operating in a first operating mode if there are monitoring values ​​that exceed the safe storage temperature or humidity of the stored grain; and after the operation of the first operating mode is completed, re-monitoring the temperature and humidity at each preset location within the warehouse body, and operating in a second operating mode if there are monitoring values ​​that exceed the safe storage temperature or humidity of the stored grain. In the first operating mode, the first damper is closed, the first fan moves to the middle of the two-stage air duct and starts up, the second fan is stopped, the exhaust from the first fan is transported to the grain stack via a portion of the three-stage air duct, and a portion of the three-stage air duct extracts air from the grain stack and returns it to the first fan for circulation, and when the temperature difference and humidity difference monitored by each of the temperature and humidity sensors become smaller than a set threshold, the first operating mode is terminated. In the second operating mode, the first damper is opened, the first fan moves to the connection end of the two-stage air duct and the single-stage air duct and starts up, the second fan starts up, the second fan extracts air from the grain stack via the ventilation cage set and adjusts the temperature and humidity via the air conditioning unit and humidity control device in turn, and returns it to the warehouse body via the first fan.

[0015] Furthermore, in the second operation mode, when T1 > T0 and RH1 < RH0, the air extracted from the grain stack is cooled to T1 ≤ T0 by the air conditioner unit and the first branch, and when the air conditioner unit is closed and the average value of the monitored humidity is lower than the safe storage humidity of the stored grain, the air extracted from the grain stack is humidified by the third branch; when T1 > T0 and RH1 > RH0, the air extracted from the grain stack is cooled to T1 ≤ T0 by the air conditioner unit and the first branch, and when the air conditioner unit is closed and the average value of the monitored humidity exceeds the safe storage humidity of the stored grain, the air extracted from the grain stack is dried by the second branch; when T1 < T0 and RH1 > RH0, the air conditioner unit is closed and the air extracted from the grain stack is dried by the second branch. T0 is the safe storage temperature of the stored grain, T1 is the average value of the monitored temperature of the warehouse body, RH0 is the safe storage humidity of the stored grain, and RH1 is the average value of the monitored humidity of the warehouse body.

Advantages of the Invention

[0016] Compared with the prior art, the advantages of the technical solution of the present invention are as follows.

[0017] In the present invention, through the cooperation of the first fan, the second fan and the first damper, by utilizing the position of the first fan, an internal circulation in which air flows through the grain stack in the warehouse body or an external circulation in which the air conditioner unit and the humidity adjustment device perform joint temperature and humidity adjustment is formed, so that uniform control of the temperature in the warehouse body can be rapidly achieved, and the temperature and humidity can be adjusted as required.

[0018] The multi-stage ventilation cages are arranged in the form of a tree branch structure, which can form a ventilation circulation like plug flow and improve the ventilation effect.

Brief Description of the Drawings

[0019] [Figure 1] It is a schematic structural diagram of an internal smart temperature and humidity control system for a grain warehouse. [Figure 2]It is a schematic plan view in which the two-stage air duct and the three-stage air duct of the embodiment are connected. [Figure 3] It is a schematic internal perspective view of the two-stage air duct of the embodiment. [Figure 4] It is a schematic cross-sectional view of the first fan of the embodiment. [Figure 5] It is a schematic structural view of the three-stage air duct of the embodiment. [Figure 6] It is a schematic telescopic structure view between each stage of the three-stage air duct of the embodiment. [Figure 7] It is a schematic cross-sectional view of the first stage of the three-stage air duct of the embodiment. [Figure 8] It is a schematic configuration view of the ventilation cage set inside the warehouse body of the embodiment. [Figure 9] It is a schematic structural view of a single ventilation cage set of the embodiment. [Figure 10] It is a schematic structural view of the air conditioner unit and the humidity control device.

Modes for Carrying Out the Invention

[0020] Hereinafter, the present invention will be further described in combination with embodiments, but it is not a limitation to the present invention.

[0021] As shown in FIG. 1, the internal smart temperature and humidity control system of the grain warehouse according to the embodiment of the present invention includes a warehouse body 2, an air conditioner unit 15, a humidity control device 16, a water storage tank 21, a control module 12, an air duct, a return air duct 10, a filter 9, a first fan 19, a second fan 8, a first damper 18, a temperature and humidity sensor 6, and a ventilation cage set 5.

[0022] As shown in FIGS. 2 to 7, the air duct includes a single-stage air duct 17, a two-stage air duct 1, and a three-stage air duct 7. The outlet of the single-stage air duct 17 is provided with a first damper 18 and is connected to the two-stage air duct 1 through the first damper 18. The first damper 18 controls the opening and closing of the single-stage air duct 17. A plurality of two-stage air ducts 1 are provided. The two-stage air ducts 1 extend in the length direction of the warehouse body 2 and are arranged above the warehouse body 2. The two-stage air ducts 1 are arranged in parallel with a gap therebetween.

[0023] As shown in Figures 3 and 4, each two-stage air duct 1 is provided with a first fan 19 that is movable along the two-stage air duct 1. Specifically, an axial sliding rail 4 is provided inside the two-stage air duct 1, and the sliding rail 4 passes through the fan case 39 of the first fan 19 and a slider 37 provided on the first fan 19. The control module 12 controls the slider 37 to move along the sliding rail 4, thereby moving the first fan 19. Exemplarily, the sliding rail 4 and the slider 37 may be screw-nut motion means. The first fan 19 is an axial flow fan, and a seal ring 38 is provided around the four sides of the fan case 39 of the first fan 19. The seal ring 38 remains in contact with the inner wall of the two-stage air duct 1 and seals, so that when the first fan 19 moves, the seal ring 38 moves with it.

[0024] As shown in Figures 5 and 6, multiple three-stage air vents 7 are connected to each two-stage air vent 1 at intervals in the axial direction. The three-stage air vents 7 have a multi-stage telescopic structure, with the top of each three-stage air vent 7 communicating with the two-stage air vent 1, and the end of each three-stage air vent 7 being closed. Each stage of the three-stage air vent 7 has an outward-facing flange at its top along the diametrical direction of its cross-section, and an inward-facing limit ring at its bottom along the diametrical direction of its cross-section. The diameter of each stage of the three-stage air vent 7 decreases sequentially from top to bottom, thereby enabling a stable fitting structure between the top of each stage of the three-stage air vent 7 and the bottom of the stage above when each stage of the three-stage air vent 7 is fully extended. An additional mounting plate 41 is fixed to the top of the first stage and the bottom of the last stage of the three-stage air vent 7, and the telescopic rod 40 is fixed and mounted between the mounting plates 41, and the three-stage air vent 7 is extended and retracted by the extension and retraction of the telescopic rod 40. It should be understood that in this embodiment, the description of the telescopic rod 40 and the mounting plates 41 is a specific outline for realizing the extension and retraction of the three-stage air vent 7.

[0025] To achieve the objective of ventilating the grain stack, ventilation holes 33 with a diameter smaller than the grain diameter are distributed on the surface of the three-stage ventilator 7. When the three-stage ventilator 7 is fully extended and inserted into the grain stack, all ventilation holes 33 are located below the grain storage line 3, and the last end of the three-stage ventilator 7 is sealed, thereby achieving ventilation to the grain stack while simultaneously sealing it.

[0026] As shown in Figure 7, the temperature and humidity sensor 6 is installed inside the three-stage air duct 7 and can move along the three-stage air duct 7 to change its height position and monitor the temperature and humidity of the grain stack. In this embodiment, a rotating shaft 35 is attached to the upper part of the first stage of the three-stage air duct 7, and a rotating shaft monitoring and control module 36 is attached to the rotating shaft 35. The temperature and humidity sensor 6 is connected to the rotating shaft 35 via a control cable 32. After the grain is stored in the warehouse, the three-stage air duct 7 is inserted into the grain stack, the rotating shaft 35 rotates, and the rotating shaft monitoring and control module 36 monitors the amount of rotation of the rotating shaft 35 and determines the height position of the temperature and humidity sensor 6, thereby enabling the temperature and humidity sensor 6 to monitor the temperature and humidity at different heights in each area in real time.

[0027] As shown in Figures 8 and 9, the ventilation cage set 5 is positioned at the bottom of the warehouse body and has a semicircular cross-section with small holes distributed on its surface, thereby accommodating loads while simultaneously blocking grain and facilitating ventilation. The ventilation cage set 5 includes a single-stage ventilation cage 24, a double-stage ventilation cage 25, and a triple-stage ventilation cage 26, with each stage of ventilation cages distributed symmetrically in the shape of tree branches. The single-stage ventilation cage 24 is positioned on both sides of the warehouse body 2 and connected to the second fan 8. The double-stage ventilation cage 25 is connected to the single-stage ventilation cage 24. The double-stage ventilation cages 25 on both sides of the warehouse body 2 are provided parallel to and intersect with the single-stage ventilation cages 24. The double-stage ventilation cage 25 is provided axially along with a plurality of connectors 27, each with a side connector joint 28, and the triple-stage ventilation cage 26 is connected to the double-stage ventilation cage 25 via the connectors 27. The connector joint 28 is a flexible joint, and in order to rationally direct airflow within each stage of the ventilation cage, the three-stage ventilation cage 26 can be fitted at a different angle to the two-stage ventilation cage 25 when in place to form a tree-branch-like structure, or the connector joint 28 can be directly closed without installing the three-stage ventilation cage 26. By arranging the ventilation cage set 5 in this way, in accordance with the airflow from the two-stage ventilator 1 and the three-stage ventilator 7, a plug-like flow is formed, improving the effect of longitudinal ventilation inside the grain.

[0028] The second fan 8 is mounted on the outside of the warehouse body 2, and the inlet of the second fan 8 is connected to the ventilation cage set 5 at the bottom of the warehouse body 2. The outlet of the second fan 8 is connected to the inlet end of the air conditioning unit 15 via a filter 9 and a return air pipe 10, so that the air inside the warehouse body 2 flows through the second fan 8 to the filter 9, is filtered, and returns to the air conditioning unit 15 via the return air pipe 10.

[0029] As shown in Figure 10, the control module 12, air conditioning unit 15, humidity control device 16, and water storage tank 21 are located outside the warehouse body 2. The outlet end of the air conditioning unit 15 is connected to the intake end of the humidity control device 16. The discharge end of the humidity control device 16 is connected to a single-stage air blower pipe 17, which, when the second fan 8 operates, draws air from inside the warehouse body 2, adjusts the temperature with the air conditioning unit 15 and the humidity with the humidity control device 16, and then returns the air to the warehouse body 2 via the single-stage air blower pipe 17.

[0030] The humidity control device 16 has a first branch, a second branch, and a third branch connected in parallel, which are provided at the intake and outlet ends. The first branch is provided with a second damper 29 and is directly connected from the intake end to the outlet end. The second branch is provided with a third damper 30 and a dehumidification area 22. The third branch is provided with a fourth damper 31 and a shower humidification area 20. The water storage tank 21 is equipped with a water storage tank valve 21-3, a water level maintenance device 21-1, and a discharge pipe 21-2. The outlet of the water storage tank valve 21-3 is connected to the shower head of the shower humidification area 20 of the humidity control device 16. The water inlet of the water storage tank 21 is connected to the air conditioner unit 15 and the water supply piping. The water supply piping is controlled by a water supply valve 23, which is connected to the water level maintenance device 21-1 via a signal transmission line. Condensed water from the air conditioner unit 15 flows into the water storage tank, and the water level maintenance device 21-1 is used to maintain the water level in the water storage tank. When the air conditioner unit 15 stops operating, the water level in the water storage tank 21 drops, and based on a signal from the water level maintenance device 21-1, the water supply valve 23 opens, and tap water flows into the water storage tank 21. When the air conditioning unit 15 continues to operate and the water level in the water storage tank 21 exceeds a set level, the discharge pipe 21-2 is used to discharge the excess water from the water storage tank. If humidification is required, it controls the water storage tank valve 21-3 to open, and shower humidification is performed via the shower head in the shower humidification area 20.

[0031] The control module 12 includes a receiver 11, a memory 13, and an actuator 14. The receiver 11 is used to read data monitored by the temperature and humidity sensors 6 in real time. The memory 13 stores the planar position coordinates of the warehouse body 2 where each temperature and humidity sensor 6 is located, the height of the corresponding temperature and humidity sensor 6 when the rotation axis 35 rotates by different angles, and the safe storage temperature and humidity range for specific grains. The actuator 14 transmits control signals to the first damper 18, second damper 29, third damper 30, fourth damper 31, water storage tank valve 21-3, air conditioning unit 15, humidity control device 16, first fan 19, telescopic rod 40, and rotation axis monitoring and control module 36, respectively, to control the operation of these devices.

[0032] The operation method of the smart temperature and humidity control system inside the grain warehouse is as follows:

[0033] Operation Mode 1: After storing the grain in the warehouse, the three-stage air duct 7 is inserted into the grain stack, the actuator 14 transmits a signal to the rotary shaft monitoring and control module 36, the rotary shaft monitoring and control module controls the rotary shaft 35 to rotate by different angles, and the temperature and humidity sensor 6 moves up and down within the three-stage air duct 7 and monitors the temperature and humidity of the area it is located in in real time. The actuator 14 calculates the difference between the measured temperature and humidity and the safe storage temperature and humidity, and determines the location of the temperature and humidity sensor if the difference is abnormal. If this location is below the grain storage line 3, the actuator 14 controls the first fan 19 to move to the intermediate position of the sliding rail 4 with the slider 37 and start operation, closing the first damper 18 and closing the second fan 8. Under the operation of the first fan 19, the air inside the grain stack flows through the ventilation holes 33 and circulates internally within the warehouse body 2. If the temperature and humidity values ​​monitored by all temperature and humidity sensors 6 are close (both the temperature difference and humidity difference are smaller than the set threshold), for example, if the largest temperature difference ΔT < 2°C and the largest humidity difference ΔRH < 5% among all the data monitored by the temperature and humidity sensors, the first fan 19 stops operating and operation mode 1 ends.

[0034] Operation Mode 2: After Operation Mode 1 has finished, if the values ​​measured by the temperature and humidity sensor 6 do not reach the safe range for the stored grain, the actuator 14 calculates the temperature and humidity values ​​of the air that needs to be flowed to the air conditioning unit 15 and the humidity control device 16. The actuator 14 controls the first fan 19 to move to the connecting end of the two-stage air duct 1 and the single-stage air duct 17 with the slider 37. The actuator 14 controls the first damper 18 to start operation, and the second fan 8 also starts operation. The actuator 14 controls the air conditioning unit 15 and the humidity control device 16 to operate. At this time, the air passes in order through the air conditioning unit 15, humidity control device 16, single-stage air duct 17, two-stage air duct 1, three-stage air duct 7, ventilation cage set 5, enters the filter 9 and return pipe 10 via the second fan 8, returns to the air conditioning unit 15, and completes the circulation.

[0035] In operation mode 2, the air conditioning unit 15 and the humidity control device 16 are coordinated, and the airflow parameters are determined based on the following logic.

[0036] Before starting operation mode 2, based on the safe storage temperature T0 and humidity RH0 of the stored grain stored in memory 13, the receiver 11 receives the temperature and humidity of each region measured by the temperature and humidity sensor 6 and calculates the average temperature T1 and average humidity RH1.

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[0037] (1) When T1 > T0 and RH1 < RH0, the grain stack needs to "reduce temperature and increase humidity". The actuator 14 controls to open the second damper 29, close the third damper 30, the fourth damper 31 and the water storage tank valve 21-3. The air conditioner unit 15 operates and blows air to the first branch of the humidity control device 16. When the temperature and humidity sensor 6 monitors that the temperature of the grain stack reaches the safe storage range, the actuator determines whether the humidity of the temperature and humidity sensor 6 reaches the safe storage range. If it reaches, the operation mode 2 ends. If it does not reach, the actuator 14 calculates the humidity value of the air that needs to flow into the humidity control device 16, closes the second damper 29 to turn off the air conditioner unit 15, controls to open the fourth damper 31 and the water storage tank valve 21-3. The shower humidification area 20 starts shower humidification, and the humidity control device 16 flows "humidified" air with a specific humidity into the one-stage air duct 17 through the third branch.

[0038] (2) When T1 > T0 and RH1 > RH0, the grain stack needs to "reduce temperature and dehumidify". The actuator 14 controls to open the second damper 29, close the third damper 30, the fourth damper 31 and the water storage tank valve 21-3. The air conditioner unit 15 operates and blows air to the first branch of the humidity control device 16. When the temperature and humidity sensor 6 monitors that the temperature of the grain stack reaches the safe storage range, the actuator 14 determines whether the humidity of the temperature and humidity sensor 6 reaches the safe storage range. If it reaches, the operation mode 2 ends. If it does not reach, the second damper 29 and the air conditioner unit 15 are closed, and the third damper 30 is controlled to open. The dehumidification area 22 starts dehumidification, and the humidity control device flows "dry" air with a specific humidity into the one-stage air duct 17 through the second branch.

[0039] (3) T1<T0、RH1> In the case of RH0, the grain stack needs to be "ventilated and dehumidified", and the air conditioning unit 15 does not operate. The actuator 14 controls the closing of the fourth damper 31, the second damper 29 and the water storage tank valve 21-3, and the opening of the third damper 30, so that the dehumidification area 22 starts dehumidification, and the humidity control device flows "dry" air of a specific humidity into the first stage air supply pipe 17 via the second branch.

[0040] In this embodiment, the temperature and humidity of the grain stacks in the warehouse are monitored in real time, and the operation of each fan, damper, water storage tank valve, air conditioning unit 15, and humidity control device 16 is controlled using the control module 12. By operating in either operation mode 1 or operation mode 2 based on different conditions, accurate temperature and humidity control of the grain stacks is achieved.

Claims

1. A smart temperature and humidity control system for the interior of a grain warehouse, The warehouse includes a warehouse body, ventilation pipes, a ventilation cage set, a return pipe, an air conditioning unit, a humidity control device, and a control module. The ventilation pipes include a single-stage ventilation pipe, a double-stage ventilation pipe, and a triple-stage ventilation pipe. The outlet end of the humidity control device is connected to the inlet of the single-stage ventilation pipe, and the outlet of the single-stage ventilation pipe is connected to the double-stage ventilation pipe. The single-stage ventilation pipe is provided with a first damper that controls the opening and closing of the single-stage ventilation pipe. Multiple double-stage ventilation pipes are provided and are located at the top of the warehouse body. A first fan is provided inside each double-stage ventilation pipe that is movable along the double-stage ventilation pipe. Each double-stage ventilation pipe is connected to multiple triple-stage ventilation pipes at intervals along the axial direction. The top of the triple-stage ventilation pipe communicates with the double-stage ventilation pipe, and the end of the triple-stage ventilation pipe is closed. The side walls of the triple-stage ventilation pipes have ventilation holes. A smart internal temperature and humidity control system for a grain warehouse, characterized in that it is a retractable pipe, a temperature and humidity sensor with a height-adjustable position is provided inside the three-stage air supply pipe, the ventilation cage set is uniformly arranged at the bottom of the warehouse body, the ventilation cage set is connected to the inlet of the return air pipe via a second fan, the outlet of the return air pipe is connected to the inlet end of the air conditioning unit, the air conditioning unit is used to transport the air to the intake end of the humidity control device after temperature adjustment, the humidity control device is used to discharge the air from the outlet end after humidity adjustment, and the control module is electrically connected to the temperature and humidity sensor and is used to control the operation of the first damper, first fan, second fan, three-stage air supply pipe, air conditioning unit and humidity control device.

2. The smart internal temperature and humidity control system for a grain warehouse according to claim 1, characterized in that the opening height of the ventilation holes in the three-stage air supply pipe is not higher than the height of the grain storage line of the warehouse body.

3. The smart internal temperature and humidity control system for a grain warehouse according to claim 1, characterized in that a rotating shaft is provided at the top of the three-stage air blower pipe, a control cable is wound around the rotating shaft, the control cable is connected to the temperature and humidity sensor, and the rotating shaft controls the position height of the temperature and humidity sensor when it rotates.

4. The smart internal temperature and humidity control system for a grain warehouse according to claim 1, characterized in that the two-stage air vents are arranged parallel to and at equal intervals above the warehouse body, and the three-stage air vents are connected vertically to the two-stage air vents at equal intervals.

5. The smart internal temperature and humidity control system for a grain warehouse according to claim 1, characterized in that the two-stage air blower pipe is provided with a sliding rail extending in the axial direction, the first fan is slidably mounted on the sliding rail, and a sealing ring is provided in the axial direction of the first fan that fits to seal with the pipe wall of the two-stage air blower pipe.

6. The QR ventilation cage set includes a single-stage ventilation cage, a double-stage ventilation cage, and a triple-stage ventilation cage. 、 The smart internal temperature and humidity control system for a grain warehouse according to claim 1, characterized in that the single-stage ventilation cage is arranged on both sides of the warehouse body, the second-stage ventilation cage is connected to the single-stage ventilation cage, the third-stage ventilation cage is connected to the side of the second-stage ventilation cage via a movable joint, the third-stage ventilation cage and the second-stage ventilation cage constitute a tree branch structure, and the second-stage ventilation cages in the single-stage ventilation cages located on both sides of the warehouse body are provided in parallel and intersecting manner.

7. The humidity control device includes a first branch, a second branch, and a third branch, which are connected in parallel between the intake end and the outlet end. The smart internal temperature and humidity control system for a grain warehouse according to claim 1, characterized in that the first branch is provided with a second damper and is directly connected from the intake end to the discharge end, the second branch is provided with a third damper and a dehumidification area, and the third branch is provided with a fourth damper and a shower humidification area.

8. Including the water storage tank, The smart internal temperature and humidity control system for a grain warehouse according to claim 7, characterized in that the drainage from the air conditioning unit is connected to the water storage tank, and the water storage tank provides shower water to the shower humidification area.

9. A method for operating an internal smart temperature and humidity control system for a grain warehouse, which is performed based on the internal smart temperature and humidity control system for a grain warehouse described in any one of claims 1 to 8. After storing the grain in the warehouse body, the three-stage air duct is inserted into the grain stack, the height of each temperature and humidity sensor is changed, and the temperature and humidity are monitored at each preset location inside the warehouse body. If there are monitored values ​​that exceed the safe storage temperature or humidity of the stored grain, the system operates in a first operating mode. After the operation of the first operating mode is completed, the temperature and humidity are monitored again at each preset location inside the warehouse body. If there are monitored values ​​that exceed the safe storage temperature or humidity of the stored grain, the system operates in a second operating mode. In the first operating mode, the first damper is closed, the first fan moves to the middle of the two-stage air duct and starts up, the second fan is stopped, the exhaust from the first fan is transported to the grain stack via a portion of the three-stage air duct, and a portion of the three-stage air duct extracts air from the grain stack and returns it to the first fan for circulation, and when the temperature difference and humidity difference monitored by each of the temperature and humidity sensors become smaller than a set threshold, the first operating mode is terminated. A method for operating an internal smart temperature and humidity control system for a grain warehouse, characterized in that, in the second operating mode, the first damper is opened, the first fan moves to the connection end of the two-stage air duct and the single-stage air duct and starts up, the second fan starts up, the second fan extracts air from the grain stack via the ventilation cage set and sequentially adjusts the temperature and humidity via the air conditioning unit and humidity control device, and returns the air to the warehouse body via the first fan.

10. In the second operating mode, if T1 > T0 and RH1 < RH0, the air extracted from the grain stack is cooled by the air conditioning unit and the first branch to T1 ≤ T0, and the air conditioning unit is closed. If the average value of the monitored humidity is lower than the safe storage humidity of the stored grain, the air extracted from the grain stack is humidified by the third branch. If T1 > T0 and RH1 > RH0, the air extracted from the grain stack is cooled by the air conditioning unit and the first branch until T1 ≤ T0, and the air conditioning unit is closed. If the average value of the monitored humidity exceeds the safe storage humidity of the stored grain, the air extracted from the grain stack is dried by the second branch. If T1 < T0 and RH1 > RH0, the air conditioning unit is closed and the air extracted from the grain stack is dried in the second branch. The method for operating the smart internal temperature and humidity control system for a grain warehouse according to claim 9, characterized in that T0 is the safe storage temperature of the stored grain, T1 is the average value of the monitored warehouse body temperature, RH0 is the safe storage humidity of the stored grain, and RH1 is the average value of the monitored warehouse body humidity.

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