Air conditioning unit for granary

Abstract

The utility model provides an air conditioning unit for a granary. The air conditioning unit comprises a shell; a fan; and a heat exchange structure is arranged between the second communication port and the outdoor communication port. According to the air conditioning unit for the granary, the draught fan with the two second communication openings is used as the evaporation draught fan, the outdoor communication opening is formed in the corresponding position of the shell, and therefore two heat exchange structures can be arranged for heat exchange, and the heat exchange efficiency is improved on the premise that the heat exchange requirement is met. The problem that the heat exchange efficiency of the part, away from the evaporation fan, of the evaporator is poor can be solved, the overall size of the air conditioning unit for the granary can be reduced by reducing the size of the evaporator, and the problem that the size of the evaporator is too large due to the fact that the evaporator can only be arranged on one side of the evaporation fan in the prior art is effectively solved. The heat exchange efficiency of the air conditioning unit for the granary is improved, and the grain storage reliability of the granary can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to grain storage device technical field, especially a grain storehouse is with air conditioning unit. BACKGROUND

[0002] With the development of agricultural production technology, the grain yield is increasing, and the grain storehouse needs to control the temperature inside the grain storehouse to prevent the grain from deteriorating. Generally, temperature adjusting devices (such as grain storehouse air conditioning unit, grain storehouse surface temperature control machine, etc.) are set outside the grain storehouse, and are connected with the grain storehouse through air outlets and air return inlets, so that air at the set temperature is sent into the grain storehouse to adjust the temperature of the grain storehouse.

[0003] However, the conventional grain storehouse needs a large heat exchange capacity, and the size of the evaporator needs to be increased to meet the needs of the grain storehouse. However, the existing grain storehouse air conditioning unit adopts a single-side air inlet centrifugal fan, which can only set the evaporator on one side of the evaporative fan. In order to improve the heat exchange capacity, the size of the evaporator needs to be increased, which will further cause the heat exchange efficiency of the evaporator far from the evaporative fan to deteriorate, resulting in uneven heat exchange effect of the evaporator and poor heat exchange efficiency, which seriously affects the storage reliability of the grain storehouse. SUMMARY

[0004] In order to solve the technical problem of poor heat exchange efficiency of the evaporator of the existing grain storehouse air conditioning unit, a grain storehouse air conditioning unit using two-side air inlet fan as evaporative fan and arranging heat exchange structure on both sides of the evaporative fan to reduce the area of single heat exchange structure to improve heat exchange efficiency and storage reliability is provided.

[0005] A grain storehouse air conditioning unit, comprising:

[0006] A housing is provided with a grain storehouse communication port and two outdoor communication ports;

[0007] A fan is arranged in the housing, and the fan is provided with a first communication port and two second communication ports, the first communication port is in communication with the grain storehouse communication port, and the two second communication ports are in one-to-one correspondence with the two outdoor communication ports;

[0008] The second communication port and the outdoor communication port are provided with a heat exchange structure.

[0009] The fan comprises a volute, the first communication port is arranged on the side wall of the volute, and one second communication port is arranged on each end plate of the volute.

[0010] The shell has a first side and two oppositely arranged second sides, the side wall of the volute is arranged opposite to the first side, the end face of the volute corresponds to the second side one by one, the silo communication port is located on the first side, and the two outdoor communication ports are arranged on the two second sides respectively.

[0011] The fan has a forward air supply mode and a reverse air supply mode, when the fan is in the forward air supply mode, the second communication port serves as an air inlet and the first communication port serves as an air outlet, and when the fan is in the reverse air supply mode, the first communication port serves as an air inlet and the second communication port serves as an air outlet.

[0012] The outdoor communication port is provided with a filter screen structure, and the silo air conditioning unit has a dust removal mode of blowing the filter screen structure, when the silo air conditioning unit is in the dust removal mode, the fan is in the reverse air supply mode.

[0013] The silo air conditioning unit further comprises a dust thickness detection mechanism, the dust thickness detection mechanism can obtain the dust thickness on the filter screen structure, and the dust thickness detection mechanism is electrically connected with the fan.

[0014] The silo air conditioning unit further comprises a damper structure, the damper structure corresponds to the outdoor communication port one by one, the damper structure has a first state of closing the outdoor communication port and a second state of completely opening the outdoor communication port, and the dust thickness detection mechanism is electrically connected with the damper structure.

[0015] The shell comprises a side plate, the side plate constitutes the damper structure, the side plate has a first limit position of completely closing the outdoor communication port and a second limit position of completely avoiding the outdoor communication port, when the damper structure is in the first state, the side plate is in the first limit position, when the damper structure is in the second state, the side plate is in the second limit position and any position between the first limit position and the second limit position, and the dust thickness detection mechanism can adjust the position of the side plate.

[0016] The shell further comprises a bottom plate, the side plate is hinged to the bottom plate, and when the side plate is in the second limit position, the plane where the side plate is located is parallel to the plane where the bottom plate is located.

[0017] The two outdoor communication openings include a first outdoor communication opening and a second outdoor communication opening, the filter screen structure includes a first filter screen structure and a second filter screen structure, the air valve structure includes a first air valve structure and a second air valve structure, the first filter screen structure and the first air valve structure are arranged at the first outdoor communication opening, the second filter screen structure and the second air valve structure are arranged at the second outdoor communication opening, the dust thickness detection mechanism can acquire the dust thickness on the first filter screen structure and the dust thickness on the second filter screen structure respectively, and the dust thickness detection mechanism can control the first air valve structure according to the dust thickness on the first filter screen structure, and the dust thickness detection mechanism can control the second air valve structure according to the dust thickness on the second filter screen structure.

[0018] The second communication opening and the corresponding heat exchange structure are provided with a flow guide structure.

[0019] The air conditioner unit for a granary provided by the utility model uses the fan with two second communication openings as the evaporative fan, and the outdoor communication opening is arranged at the corresponding position of the shell, so that two heat exchange structures can be arranged to exchange heat, under the premise of meeting the heat exchange demand, the problem of poor heat exchange efficiency of the evaporator far away from the evaporative fan can be avoided, the size of the evaporator can be reduced to reduce the overall size of the air conditioner unit for a granary, the problem of the size of the evaporator being too large due to the evaporator being arranged on the single side of the evaporative fan in the prior art is effectively avoided, the heat exchange efficiency of the air conditioner unit for a granary is improved, and the storage reliability of the granary for grain can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure schematic view of the air conditioner unit for a granary provided by the utility model embodiment is provided.

[0021] Figure 2 The other structure schematic view of the air conditioner unit for a granary provided by the utility model embodiment is provided.

[0022] Figure 3 The other structure schematic view of the air conditioner unit for a granary provided by the utility model embodiment is provided.

[0023] Figure 4 The gas flow direction diagram when the fan in the air conditioner unit for a granary provided by the utility model embodiment is in the forward air supply mode is provided.

[0024] Figure 5 The gas flow direction diagram when the fan in the air conditioner unit for a granary provided by the utility model embodiment is in the reverse air supply mode is provided.

[0025] In the drawing:

[0026] 1, shell; 11, granary communication port; 12, outdoor communication port; 2, fan; 21, first communication port; 22, second communication port; 3, heat exchange structure; 13, side plate; 14, bottom plate; 121, first outdoor communication port; 122, second outdoor communication port; 41, first filter screen structure; 42, second filter screen structure. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model clearer and more understandable, the following will make further detailed description to the utility model by combining with the drawings and examples. It should be understood that the specific examples described here are only for explaining the utility model, and are not used to limit the utility model.

[0028] In order to make the person in the art better understand the utility model scheme, the following will combine the drawings in the examples of the utility model, and the technical scheme in the examples of the utility model is described clearly and completely, obviously, the described examples are only a part of the examples of the utility model, and not all the examples. Based on the examples in the utility model, all other examples obtained by the person skilled in the art without making creative labor should belong to the protection scope of the utility model.

[0029] It should be noted that the terms "first", "second" and the like in the description of the utility model and claims and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, the process, method, system, product or equipment including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0030] It should be noted that in the description of the utility model, the terms "up", "down", "left", "right", "in", "out" and the like indicate the direction or position relationship of the terms based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0031] In addition, it needs to be explained that, in the description of the utility model, unless another explicit provision and limitation, the term "installation", "arrangement", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be direct connection, also can be indirect connection through the intermediate medium, also can be two element internal communication. For the person skilled in the art, the above-mentioned term can be understood according to the specific meaning in the utility model.

[0032] Traditional granary needs larger heat exchange capacity, needs to increase the size of evaporator to meet the demand of granary, but the existing granary air conditioning unit all adopts single-side air inlet centrifugal fan, which can only set evaporator on the single side of evaporating fan, in order to improve the heat exchange capacity, only the size of evaporator can be increased, which will further cause the heat exchange efficiency of the part of evaporator far from evaporating fan to be poor, resulting in the problem of uneven heat exchange effect of evaporator and poor heat exchange efficiency, which seriously affects the storage reliability of granary to grain.

[0033] Therefore, the present application provides a granary air conditioning unit as shown in Figures 1 to 5 The granary air conditioning unit includes: a shell 1, the shell 1 is provided with a granary communication port 11 and two outdoor communication ports 12; a fan 2, the fan 2 is arranged in the shell 1, the fan 2 is provided with a first communication port 21 and two second communication ports 22, the first communication port 21 is communicated with the granary communication port 11, and the two second communication ports 22 are communicated with the two outdoor communication ports 12 one by one; the second communication port 22 and the outdoor communication port 12 are provided with a heat exchange structure 3. The fan 2 with two second communication ports 22 is used as the evaporating fan 2, and the outdoor communication port 12 is arranged at the corresponding position of the shell 1, so that two heat exchange structures 3 can be arranged for heat exchange, which can avoid the problem of poor heat exchange efficiency of the part of evaporator far from the evaporating fan 2 under the premise of meeting the heat exchange capacity demand, and can reduce the overall size of the granary air conditioning unit by reducing the size of the evaporator, effectively avoiding the problem of large size of the evaporator caused by the single-side setting of the evaporator in the prior art, improving the heat exchange efficiency of the granary air conditioning unit, and improving the storage reliability of the granary to grain.

[0034] As an implementation, the fan 2 comprises a volute, the first communication port 21 is arranged on the side wall of the volute, and one of the second communication ports 22 is arranged on each of the two end plates of the volute. By arranging the second communication ports 22 on the two end plates, the fan 2 can realize air intake and air exhaust on both sides. By arranging the first communication port 21 on the side wall of the fan 2, the air exhaust of the first communication port 21 and the air intake of the second communication port 22 are avoided, the working reliability of the fan 2 is ensured, and the heat exchange structure 3 located at the second communication port 22 can also obtain air flow to ensure the heat exchange efficiency. When the second communication port 22 is used as the air inlet and the first communication port 21 is used as the air outlet, the fan 2 is in the axial air intake and the circumferential air exhaust. When the first communication port 21 is used as the air inlet and the second communication port 22 is used as the air outlet, the fan 2 is in the circumferential air intake and the axial air exhaust. Preferably, the fan 2 is a centrifugal fan 2, the second communication ports 22 are arranged on the two axial sides of the centrifugal fan 2, and the first communication port 21 is arranged on the side wall of the volute.

[0035] The shell 1 has a first side and two oppositely arranged second sides, the side wall of the volute is arranged opposite to the first side, the end face of the volute corresponds to the second side one by one, the granary communication port 11 is located on the first side, and the two outdoor communication ports 12 are arranged on the two second sides, respectively. According to the distribution positions of the first communication port 21 and the second communication port 22 of the fan 2, the corresponding granary communication port 11 and outdoor communication port 12 are arranged on the shell 1, which facilitates the arrangement of the heat exchange structure 3 and enables the air to flow linearly between the first communication port 21 and the granary communication port 11 and between the second communication port 22 and the outdoor communication port 12, reduces the turning of the air in the shell 1, avoids the occurrence of air stagnation, and further improves the working reliability of the granary air conditioning unit.

[0036] The fan 2 has a forward air supply mode and a reverse air supply mode. When the fan 2 is in the forward air supply mode, the second communication port 22 is used as the air inlet and the first communication port 21 is used as the air outlet. When the fan 2 is in the reverse air supply mode, the first communication port 21 is used as the air inlet and the second communication port 22 is used as the air outlet. By switching the working mode of the fan 2, the direction of the air flow in the shell 1 is changed, the filter structure arranged at the outdoor communication port 12 can be back-flushed and cleaned, and the cleaning of the granary air conditioning unit is facilitated.

[0037] Specifically, the outdoor communication port 12 is provided with a filter screen structure, the grain warehouse air conditioning unit has a dust removal mode of back blowing the filter screen structure, and when the grain warehouse air conditioning unit is in the dust removal mode, the fan 2 is in a reverse air supply mode. When the grain warehouse air conditioning unit supplies air to the grain warehouse, the air outside the shell 1 enters the shell 1 through the outdoor communication port 12, passes through the heat exchange structure 3, flows through the fan 2, and is finally supplied into the grain warehouse through the grain warehouse communication port 11, so as to realize heat exchange of the grain warehouse. At this time, the air outside the shell 1 is filtered by the filter screen structure when passing through the outdoor communication port 12, and impurities in the air are filtered and remain on the filter screen structure. When the dust on the filter screen structure is too much, the grain warehouse air conditioning unit switches to the dust removal mode, and at this time, the fan 2 blows air in reverse, and the air reversely passes through the fan 2 and the filter screen structure, so as to blow the impurities on the filter screen structure away from the shell 1 in reverse, so as to achieve the purpose of dust removal and cleaning of the filter screen structure.

[0038] The grain warehouse air conditioning unit further comprises a dust thickness detection mechanism, the dust thickness detection mechanism can obtain the dust thickness on the filter screen structure, and the dust thickness detection mechanism is electrically connected with the fan 2. By judging the dust thickness on the filter screen structure, it is determined whether the filter screen structure needs to be cleaned. If the dust thickness reaches or exceeds a preset value, the fan 2 is controlled to switch to the reverse air supply mode and blow air in reverse.

[0039] The grain warehouse air conditioning unit further comprises a wind valve structure, the wind valve structure corresponds to the outdoor communication port 12 one by one, and the wind valve structure has a first state of closing the outdoor communication port 12 and a second state of completely opening the outdoor communication port 12, and the dust thickness detection mechanism is electrically connected with the wind valve structure. The working state of the outdoor communication port 12 is controlled by the wind valve structure, the opening degree of the outdoor communication port 12 can be adjusted, and since there are two outdoor communication ports 12, the dust thicknesses on the two filter screen structures may not be consistent. At this time, by adjusting the wind valve structure, the air flow direction of the fan 2 when blowing air in reverse can be controlled when the filter screen structure is cleaned, the filter screen structure is reversely blown in a targeted manner, and the cleaning effect of the filter screen structure is improved.

[0040] As an implementation, the shell 1 comprises a side plate 13, which constitutes the air valve structure. The side plate 13 has a first limit position completely enclosing the outdoor communication port 12 and a second limit position completely avoiding the outdoor communication port 12. When the air valve structure is in the first state, the side plate 13 is in the first limit position. When the air valve structure is in the second state, the side plate 13 is in the second limit position and any position between the first limit position and the second limit position. The dust thickness detection mechanism can adjust the position of the side plate 13. By adjusting the position of the side plate 13, the opening of the outdoor communication port 12 is adjusted. Only the structure of the shell 1 needs to be improved, and no additional air valve structure is needed, which reduces the production cost of the air conditioning unit for the grain depot.

[0041] The shell 1 further comprises a bottom plate 14, and the side plate 13 is hinged to the bottom plate 14. When the side plate 13 is in the second limit position, the plane of the side plate 13 is parallel to the plane of the bottom plate 14. By hinging the side plate 13 to the bottom plate 14, the side plate 13 can rotate relative to the bottom plate 14, which facilitates the arrangement of the side plate 13. Meanwhile, the side plate 13 can be parallel to the bottom plate 14 in the second limit position, thereby avoiding the outdoor communication port 12 to the greatest extent and ensuring the opening of the outdoor communication port 12.

[0042] Specifically, as shown in Figure 2 When the side plate 13 is in the first limit position, the side plate 13 is vertically arranged and perpendicular to the bottom plate 14. When the side plate 13 is in the second limit position, the side plate 13 is horizontally arranged and parallel to the bottom plate 14. The rotation angle of the side plate 13 ranges from 0° to 90°.

[0043] As shown in Figure 2As shown, the two outdoor connecting ports 12 include a first outdoor connecting port 121 and a second outdoor connecting port 122, the filter structure includes a first filter structure 41 and a second filter structure 42, the air valve structure includes a first air valve structure and a second air valve structure, the first filter structure 41 and the first air valve structure are both arranged at the first outdoor connecting port 121, the second filter structure 42 and the second air valve structure are both arranged at the second outdoor connecting port 122, the dust thickness detection mechanism can respectively obtain the dust thickness on the first filter structure 41 and the dust thickness on the second filter structure 42, and the dust thickness detection mechanism can control the first air valve structure according to the dust thickness on the first filter structure 41, and the dust thickness detection mechanism can control the second air valve structure according to the dust thickness on the second filter structure 42. Since the first outdoor connecting port 121 and the second outdoor connecting port 122 face different sides of the shell 1, the dust thickness on the first filter structure 41 and the second filter structure 42 may be inconsistent. At this time, the gas flow direction of the fan 2 when the air is discharged in the reverse direction is controlled by adjusting the first air valve structure and the second air valve structure, so as to achieve targeted backblowing of the first filter structure 41 or the second filter structure 42, thereby improving the cleaning effect of the filter structure.

[0044] Specifically, the preset dust thickness is set to d0. At this time, the dust thickness detection mechanism detects the dust thickness d1 on the first filter structure 41 and the dust thickness d2 on the second filter structure 42 respectively. When d1>d0, it is determined that the first filter structure 41 needs to be cleaned at this time. At this time, the first air valve structure opens the first outdoor connecting port 121, and the second air valve structure closes the second outdoor connecting port 122. The fan 2 switches to the reverse air supply mode, so that the backwash airflow of the fan 2 only passes through the first filter structure 41, thereby cleaning the first filter structure 41; similarly, when d2>d0, it is determined that the second filter structure 42 needs to be cleaned at this time. At this time, the second air valve structure opens the second outdoor connecting port 122, and the first air valve structure closes the first outdoor connecting port 121. The fan 2 switches to the reverse air supply mode, so that the backwash airflow of the fan 2 only passes through the second filter structure 42, thereby cleaning the second filter structure 42.

[0045] Further, the operation frequency of the fan 2 can be adjusted, and at this time, d1 and d0 and d2 and d0 are judged simultaneously, when d1>d0 and d2≤d0, it is determined that only the first filter screen structure 41 needs to be cleaned at this time, the first air valve structure opens the first outdoor communication port 121, the second air valve structure closes the second outdoor communication port 122, the fan 2 switches to the reverse air supply mode, and the operation frequency of the fan 2 is switched to 50%, so that the back blowing airflow of the fan 2 only passes through the first filter screen structure 41, achieving cleaning of the first filter screen structure 41; similarly, when d2>d0 and d1≤d0, it is determined that only the second filter screen structure 42 needs to be cleaned at this time, the second air valve structure opens the second outdoor communication port 122, the first air valve structure closes the first outdoor communication port 121, the fan 2 switches to the reverse air supply mode, and the operation frequency of the fan 2 is switched to 50%, so that the back blowing airflow of the fan 2 only passes through the second filter screen structure 42, achieving cleaning of the second filter screen structure 42; when d1>d0 and d2>d0, it indicates that the first filter screen structure 41 and the second filter screen structure 42 both need to be cleaned at this time, the first air valve structure is controlled to switch to the second state first, and the second air valve structure remains in the first state, the first filter screen structure 41 is cleaned first, and then after d1≤d0, the first air valve structure is controlled to switch to the first state, the second air valve structure is controlled to switch to the second state, and the second filter screen structure 42 is cleaned.

[0046] When the filter screen structure is cleaned, the opening of the air valve structure can be further adjusted, and by adjusting the opening, the flow area of the outdoor communication port 12 is changed, so that the wind speed and wind pressure can be improved, and the cleaning effect of the filter screen structure is further improved.

[0047] Specifically, when the filter screen structure needs to be cleaned, the opening angle of the side plate 13 corresponding to the outdoor communication port 12 can be adjusted, and the opening angle θ of the side plate 13 is adjusted according to the dust thickness on the first filter screen structure 41, and the specific formula is:

[0048] θ=D1+K1*d;

[0049] D1 is a preset angle for cleaning the filter screen structure in the grain silo air conditioning unit;

[0050] K1 is a proportional coefficient;

[0051] d is the dust thickness on the filter screen structure;

[0052] When θ>θmax, θ is opened according to θmax, and at this time the side plate 13 is opened to the second limit position;

[0053] When θ<θmin, θ is opened according to θmin, and at this time the side plate 13 is opened to the preset angle D1 in the grain silo air conditioning unit;

[0054] When θmin≤θ≤θmax, the opening angle θ of the side plate 13 is adjusted according to the value calculated by the above formula.

[0055] The second communication port 22 and the corresponding heat exchange structure 3 are provided with a flow guide structure. The flow guide structure enables the air flow between the fan 2 and the heat exchange structure 3 to flow reliably, avoids the occurrence of wind trapping phenomenon, and improves the working reliability of the air conditioning unit for the granary. Preferably, the flow guide structure can be a flow guide plate, which is distributed between the second communication port 22 and the heat exchange structure 3 in the shape of a trumpet or a trumpet-like shape.

[0056] The above-mentioned embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A grain bin air conditioning unit, characterized by: The application relates to a grain-bin air-conditioning unit. The grain-bin air-conditioning unit comprises a housing (1) provided with a grain-bin communication port (11) and two outdoor communication ports (12); a fan (2) arranged in the housing (1) and provided with a first communication port (21) and two second communication ports (22), the first communication port (21) being in communication with the grain-bin communication port (11), and the two second communication ports (22) being in one-to-one correspondence with the two outdoor communication ports (12); and a heat exchange structure (3) arranged between the second communication ports (22) and the outdoor communication ports (12). The fan (2) comprises a volute, the volute is provided with the first communication port (21) on a side wall, and each end plate of the volute is provided with one second communication port (22). The housing (1) has a first side and two second sides arranged oppositely, the side wall of the volute is arranged oppositely to the first side, the end face of the volute is in one-to-one correspondence with the second side, the grain-bin communication port (11) is located on the first side, and the two outdoor communication ports (12) are arranged on the two second sides respectively.

2. The air conditioning unit for a grain bin of claim 1, wherein: The fan (2) has a forward air supply mode and a reverse air supply mode, when the fan (2) is in the forward air supply mode, the second communication port (22) serves as an air inlet, and the first communication port (21) serves as an air outlet, when the fan (2) is in the reverse air supply mode, the first communication port (21) serves as an air inlet, and the second communication port (22) serves as an air outlet.

3. The air conditioning unit for a grain bin of claim 2, wherein: The outdoor communication port (12) is provided with a filter screen structure, the grain-bin air-conditioning unit has a dust removal mode for blowing the filter screen structure reversely, and when the grain-bin air-conditioning unit is in the dust removal mode, the fan (2) is in the reverse air supply mode.

4. The air conditioning unit for a grain bin of claim 1, wherein: The grain-bin air-conditioning unit further comprises a dust thickness detection mechanism, the dust thickness detection mechanism can obtain the dust thickness on the filter screen structure, and the dust thickness detection mechanism is electrically connected with the fan (2).

5. The air conditioning unit for a grain bin of claim 4, wherein: The grain-bin air-conditioning unit further comprises a wind valve structure, the wind valve structure is in one-to-one correspondence with the outdoor communication port (12), the wind valve structure has a first state of closing the outdoor communication port (12) and a second state of completely opening the outdoor communication port (12), and the dust thickness detection mechanism is electrically connected with the wind valve structure.

6. The air conditioning unit for a grain bin of claim 5, wherein: The housing (1) comprises a side plate (13), the side plate (13) constitutes the wind valve structure, the side plate (13) has a first limit position of completely closing the outdoor communication port (12) and a second limit position of completely avoiding the outdoor communication port (12), when the wind valve structure is in the first state, the side plate (13) is in the first limit position, when the wind valve structure is in the second state, the side plate (13) is in the second limit position and any position between the first limit position and the second limit position, and the dust thickness detection mechanism can adjust the position of the side plate (13).

7. The air conditioning unit for a grain bin of claim 6, wherein: ​ 8. The air conditioning unit for a grain bin of claim 7, wherein: ​ 9. The air conditioning unit for a grain bin of claim 8, wherein: The shell (1) further comprises a bottom plate (14), the side plate (13) is hinged to the bottom plate (14), and when the side plate (13) is in the second limit position, the plane where the side plate (13) is located is parallel to the plane where the bottom plate (14) is located.

10. The air conditioning unit for a grain bin of claim 7, wherein: Two of the outdoor communication openings (12) comprise a first outdoor communication opening (121) and a second outdoor communication opening (122), the filter screen structure comprises a first filter screen structure (41) and a second filter screen structure (42), the air valve structure comprises a first air valve structure and a second air valve structure, the first filter screen structure (41) and the first air valve structure are arranged at the first outdoor communication opening (121), the second filter screen structure (42) and the second air valve structure are arranged at the second outdoor communication opening (122), the dust thickness detection mechanism can obtain the dust thickness on the first filter screen structure (41) and the dust thickness on the second filter screen structure (42) respectively, and the dust thickness detection mechanism can control the first air valve structure according to the dust thickness on the first filter screen structure (41), and the dust thickness detection mechanism can control the second air valve structure according to the dust thickness on the second filter screen structure (42).

11. The air conditioning unit for a grain bin of claim 1, wherein: The second communication opening (22) and the corresponding heat exchange structure (3) are provided with a flow guide structure.

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