Air return assembly and air conditioning unit for granary

Abstract

The utility model provides an air return assembly and an air conditioning unit for a granary. The air return assembly comprises an air return pipeline; a filtering structure; a spraying structure; the driving mechanism is in transmission connection with the filtering structure, and the driving mechanism can drive the filtering structure to rotate. According to the air return assembly and the air conditioning unit for the granary, the spraying structure is used for spraying to the filtering structure, meanwhile, the driving mechanism can drive the filtering structure to rotate, and therefore under the combined action of liquid sprayed by the spraying structure and centrifugal force generated in the rotating process of the filtering structure, the air return effect is improved. And meanwhile, centrifugal force can enable liquid to be separated from the filtering structure more quickly, so that the filtering structure recovers to be dry as soon as possible, the air conditioning unit for the granary can be recovered to be used as soon as possible, the grain storage effect is improved, and the working reliability of the air conditioning unit for the granary is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of granary equipment, in particular to a return air assembly and an air conditioner unit for a granary. Background Art

[0002] After a good harvest, grains need to be stored in a granary. However, the length of the storage time is closely related to the temperature and humidity of the storage environment. At too high a temperature and too low a humidity, the taste and quality of the grains will be affected. Therefore, it is necessary to adjust and control the temperature and humidity of the granary to keep the grains in the best state.

[0003] Generally, a granary air conditioner is placed outside the granary and connected to the granary through an air supply opening and a return air opening. There is a large amount of dust inside the granary air conditioner. Usually, a filter screen is installed in the return air duct to prevent a large amount of dust from adhering to the evaporator and affecting heat exchange. If the filter screen cannot be cleaned in time, the blockage of the air duct will also affect the performance of the air conditioner.

[0004] Most of the existing technologies require manual inspection of the filter screen blockage regularly, and the filter screen needs to be manually disassembled and cleaned, which is time-consuming and laborious. During the disassembly process, dust may fall into the air duct, causing secondary pollution and seriously affecting the working reliability of the air conditioner. Summary of the Utility Model

[0005] In order to solve the technical problem that the reliability of the air conditioner is affected only by manual inspection and cleaning of the filter screen in the prior art, a return air assembly and an air conditioner unit for a granary are provided, which use cleaning and centrifugal force to remove the dust on the filter screen to reduce the operation difficulty and improve the reliability.

[0006] A return air assembly includes:

[0007] A return air duct;

[0008] A filtering structure, which is arranged in the return air duct;

[0009] A spraying structure, which is arranged in the return air duct, and the spraying direction of the spraying structure faces the filtering structure;

[0010] A driving mechanism, which is in transmission connection with the filtering structure, and the driving mechanism can drive the filtering structure to rotate.

[0011] A drainage cavity is formed on the return air duct. The drainage cavity is located on the periphery of the filtering structure, and a drainage hole is arranged on the return air duct. The inside of the return air duct is communicated with the drainage cavity through the drainage hole.

[0012] The return air assembly further includes a drainage structure, which is arranged on the return air duct, and the drainage structure and the return air duct jointly enclose the drainage cavity.

[0013] The cross-section of the drainage cavity is annular, and the rotation axis of the filtering structure is collinear with the central axis of the drainage cavity.

[0014] The return air assembly further includes a first partition board, which is arranged in the drainage cavity, and the first partition board and the filtering structure are in the same plane. The first partition board divides the drainage cavity into a first drainage part and a second drainage part along the air flow direction of the return air duct. Both the first drainage part and the second drainage part are internally communicated with the inside of the return air duct through the corresponding drainage holes.

[0015] A drainage port is arranged on the drainage cavity, and the drainage port has a drainage state of opening the drainage cavity and a sealing state of closing the drainage cavity.

[0016] The return air assembly further includes a control device, and both the spraying structure and the driving mechanism are electrically connected to the control device.

[0017] Air valve structures are arranged on both sides of the filtering structure. The air valve structures have a closed state of closing the return air duct and a ventilation state of opening the return air duct, and the air valve structures are electrically connected to the control device.

[0018] The return air assembly further includes a wind speed detection mechanism, which can obtain the wind speed values on both sides of the filtering structure, and the wind speed detection mechanism is electrically connected to the control device.

[0019] The return air assembly further includes a humidity detection mechanism, which can obtain the humidity at the filtering structure and the humidity in the granary where the return air assembly is applied, and the humidity detection mechanism is electrically connected to the air valve structure and the control device.

[0020] The return air assembly further includes a fan, which is communicated with the return air duct. The fan has a first state of enabling the gas to pass through the filtering structure in the forward direction, and the fan also has a second state of enabling the gas to pass through the filtering structure in the reverse direction.

[0021] The return air duct includes a first connecting section, a filtering section and a second connecting section that are sequentially communicated. The filtering structure is arranged in the filtering section. The first connecting section is detachably connected to the filtering section, and the second connecting section is detachably connected to the filtering section.

[0022] The number of the spraying structures is two, and the two spraying structures are respectively arranged on both sides of the filtering structure.

[0023] The spray structure includes a spray head, the spray head is arranged on the return air duct, and the spray direction of the spray head faces the filter structure.

[0024] An air conditioner unit for a granary includes the above-mentioned return air assembly.

[0025] The return air assembly and the air conditioner unit for a granary provided by the present utility model utilize the spray structure to spray the filter structure. At the same time, the driving mechanism can drive the filter structure to rotate. Thus, under the combined action of the liquid sprayed by the spray structure and the centrifugal force generated during the rotation of the filter structure, the cleaning effect on the filter structure is improved. At the same time, the centrifugal force can make the liquid separate from the filter structure faster, enabling the filter structure to dry out as soon as possible, enabling the air conditioner unit for a granary to resume use as soon as possible, improving the storage effect of grains and the working reliability of the air conditioner unit for a granary. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the return air assembly provided by an embodiment of the present utility model;

[0027] Figure 2 It is a cross-sectional view of the return air assembly provided by an embodiment of the present utility model;

[0028] Figure 3 It is a cross-sectional view of the filter section of the return air assembly provided by an embodiment of the present utility model;

[0029] Figure 4 It is a perspective view of the filter section of the return air assembly provided by an embodiment of the present utility model;

[0030] Figure 5 It is a schematic structural diagram of the water inlet chamber and the drain chamber of the return air assembly provided by an embodiment of the present utility model;

[0031] Figure 6 It is a schematic structural diagram of the filter structure of the return air assembly provided by an embodiment of the present utility model;

[0032] In the figure:

[0033] 1. Return air duct; 2. Filter structure; 3. Spray structure; 4. Driving mechanism; 5. Drain chamber; 11. Drain hole; 6. First partition; 51. First drainage part; 52. Second drainage part; 53. Drain outlet; 7. Air valve structure; 12. Water inlet chamber; 13. First communication section; 14. Filter section; 15. Second communication section. Detailed Embodiments

[0034] In order to make the objectives, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0035] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0036] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances for the embodiments of the present utility model described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0037] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This 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. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0039] Granary air conditioners are usually placed outside the granary and connected to the granary through air supply and return vents. Granary air conditioners are dusty inside, so a filter is usually installed in the return air duct to prevent a large amount of dust from adhering to the evaporator and affecting heat exchange. If the filter is not cleaned in time, the air duct will be blocked, which will also affect the performance of the air conditioner. Most of the existing technologies require manual regular inspection of the filter blockage, and the filter needs to be manually disassembled and cleaned, which is time-consuming and laborious. During the disassembly process, dust may fall into the air duct, causing secondary pollution, which seriously affects the working reliability of the air conditioner. To this end, the present application provides a method such as Figures 1 to 6 The return air assembly shown includes: a return air duct 1; a filter structure 2, the filter structure 2 is arranged in the return air duct 1; a spray structure 3, the spray structure 3 is arranged in the return air duct 1, and the spray direction of the spray structure 3 is toward the filter structure 2; a drive mechanism 4, the drive mechanism 4 is connected to the filter structure 2 in a transmission manner, and the drive mechanism 4 can drive the filter structure 2 to rotate. The spray structure 3 is used to spray the filter structure 2, and the drive mechanism 4 can drive the filter structure 2 to rotate, so that the cleaning effect of the filter structure 2 is improved under the combined action of the liquid sprayed by the spray structure 3 and the centrifugal force generated during the rotation of the filter structure 2, and the centrifugal force can make the liquid separate from the filter structure 2 faster, so that the filter structure 2 can be restored to dryness as soon as possible, so that the air conditioner for the granary can be restored to use as soon as possible, and the storage effect of the grain and the working reliability of the air conditioner for the granary can be improved.

[0040] When the return air assembly is working normally, the airflow flows in the return air duct 1, and is filtered by the filter structure 2 in the process of flowing through the filter structure 2. The filtered airflow continues to flow in the return air duct 1 and reaches the preset structure (such as the evaporator); when the filter structure 2 needs to be cleaned, the airflow is stopped from entering the return air duct 1, and then the spray structure 3 is turned on to spray and clean the filter structure 2, and the drive mechanism 4 is controlled to drive the filter structure 2 to rotate. At this time, the dust on the filter structure 2 will flow to the surrounding side of the filter structure 2 under the action of water and centrifugal force, thereby achieving the cleaning of the filter structure 2. Furthermore, after stopping the spraying of the spray structure 3, the drive mechanism 4 can be controlled to work, and the filter structure 2 can be controlled to continue to rotate for drying, thereby increasing the drying speed of the filter structure 2, so that the return air duct 1 can restore the gas supply faster, thereby improving the storage effect of grain and the working reliability of the air conditioning unit for the granary.

[0041] The driving mechanism 4 is a motor, which is arranged on the return air duct through the motor, and the filter structure is arranged on the driving shaft of the motor. The rotation of the motor can drive the filter structure to rotate.

[0042] During the cleaning process of the filtering structure 2, the spraying structure 3 sprays liquid (such as water) onto the filtering structure 2. To achieve the discharge of the liquid, a drainage cavity 5 is formed on the return air duct 1. The drainage cavity 5 is located on the periphery of the filtering structure 2, and a drainage hole 11 is provided on the return air duct 1. The interior of the return air duct 1 is communicated with the drainage cavity 5 through the drainage hole 11. During the cleaning process of the filtering structure 2, the liquid will flow downward under the action of gravity and can also flow toward the inner wall of the return air duct 1 under the action of centrifugal force. At this time, the liquid and dust at the cleaning position can flow into the drainage cavity 5 through the drainage hole 11 and are finally discharged through the drainage cavity 5. Among them, during the rotation of the filtering structure 2, the action of centrifugal force can directly throw some liquid and dust into the drainage cavity 5 through the drainage hole 11, improving the efficiency of liquid and dust discharge, reducing the problem that the liquid flows in the return air duct 1 and affects the reliability of other structures, and improving the reliability of the return air assembly and the air conditioner unit for the granary.

[0043] Specifically, the return air assembly further includes a drainage structure. The drainage structure is arranged on the return air duct 1, and the drainage structure and the return air duct 1 jointly enclose the drainage cavity 5. By additionally arranging a drainage structure on the return air duct 1, the processing difficulty of the return air duct 1 is reduced, and at the same time, the maintenance of the drainage structure is also facilitated. When there is too much dust in the drainage structure, the drainage structure can be removed for maintenance, overcoming the problem in the prior art that the return air duct 1 needs to be removed for maintenance, and improving the convenience of maintaining the return air assembly.

[0044] Since the filtering structure 2 rotates, the centrifugal force will cause the liquid and dust on the filtering structure 2 to be thrown out to the periphery of the filtering structure 2. For this reason, the cross-section of the drainage cavity 5 is annular, and the rotation axis of the filtering structure 2 coincides with the central axis of the drainage cavity 5. The annular drainage cavity 5 can collect the liquid and dust thrown out from the periphery of the filtering structure 2, thereby improving the drainage efficiency of the return air assembly and avoiding the problem of liquid flowing in the return air duct 1. At the same time, the annular drainage cavity 5 can drain the liquid and dust in the drainage cavity 5 to the lowest point of the drainage cavity 5, ensuring the drainage reliability of the drainage cavity 5.

[0045] Due to the existence of the drainage cavity 5, the gas will flow directly through the drainage cavity 5 without passing through the filtering structure 2. Therefore, the return air assembly further includes a first partition 6. The first partition 6 is arranged in the drainage cavity 5, and the first partition 6 and the filtering structure 2 are in the same plane. The first partition 6 divides the drainage cavity 5 along the air flow direction of the return air duct 1 into a first drainage part 51 and a second drainage part 52. Both the first drainage part 51 and the second drainage part 52 are internally communicated with the inside of the return air duct 1 through the corresponding drainage holes 11. The first partition 6 is used to block the air flow flowing into the drainage cavity 5. At the same time, since the first partition 6 and the filtering structure 2 are in the same plane, the first drainage part 51 and the second drainage part 52 are respectively located on both sides of the filtering structure 2. The gas flowing into the first drainage part 51 or the gas flowing into the second drainage part 52 cannot continue to flow, so that the gas can only flow through the filtering structure 2, ensuring the filtering effect of the filtering structure 2 and further ensuring the working reliability of the return air assembly. Preferably, the filtering structure 2 is a filter net. The filter net and the first partition 6 are in the same plane, and there is a clearance between the edge of the filter net and the inner wall of the return air duct.

[0046] A drain opening 53 is arranged on the drainage cavity 5. The drain opening 53 has a drainage state for opening the drainage cavity 5 and a sealing state for closing the drainage cavity 5. By switching the drain opening 53 to the drainage state, the liquid and the washed-out dust in the drainage cavity 5 can be discharged from the return air assembly. At the same time, when the drain opening 53 is switched to the sealing state, the gas entering the drainage cavity 5 cannot flow through the drain opening 53, ensuring the working reliability of the return air assembly. As Figure 1 shown in the figure, drain openings 53 are arranged on both the first drainage part 51 and the second drainage part 52. The first drainage part 51 and the second drainage part 52 can be drained separately, which can not only ensure that the gas can only flow through the filtering structure 2, but also ensure the reliable drainage of the first drainage part 51 and the second drainage part 52.

[0047] The return air assembly further includes a control device. Both the spraying structure 3 and the driving mechanism 4 are electrically connected to the control device. Through the control device, the spraying structure 3 and the driving mechanism 4 are controlled in a linkage manner, so as to realize the purpose of automatically cleaning the filtering structure 2, effectively overcoming the problem in the prior art that the filter net can only be manually removed for cleaning, reducing the cleaning difficulty and operation complexity, and improving the user experience.

[0048] In order to avoid affecting other structures connected to the return air assembly during the cleaning process of the filtering structure 2, air valve structures 7 are provided on both sides of the filtering structure 2. The air valve structure 7 has a closed state for closing the return air duct 1 and a ventilation state for opening the return air duct 1, and the air valve structure 7 is electrically connected to the control device. When ventilating using the return air duct 1, the air valve structure 7 switches to the ventilation state, and gas can flow through the air valve structure 7. When it is necessary to clean the filtering structure 2, both air valve structures 7 switch to the closed state. At this time, it can be avoided that the liquid sprayed by the spraying structure 3 passes through the air valve structure 7, thereby preventing the liquid from flowing to other structures connected to the return air pipeline, and ensuring the working reliability of the return air assembly.

[0049] The return air assembly further includes a wind speed detection mechanism. The wind speed detection mechanism can obtain the wind speed values on both sides of the filtering structure 2, and the wind speed detection mechanism is electrically connected to the control device. The wind speed values on both sides of the filtering structure 2 are obtained by using the wind speed detection mechanism. If the wind speed difference is greater than a preset value, it is determined that the filtering structure 2 is severely blocked and needs to be cleaned. Then, the air valve structure 7 can be controlled to switch to the closed state, and the spraying structure 3 and the driving mechanism 4 start to work, so as to start cleaning the filtering structure 2. If the wind speed difference is not greater than the preset value, it is determined that the filtering structure 2 is not severely blocked and does not need to be cleaned. Then, the air valve structure 7 can be controlled to switch to the ventilation state, and the spraying structure 3 and the driving mechanism 4 stop working, so as to keep the return air assembly supplying air.

[0050] The return air assembly further includes a humidity detection mechanism. The humidity detection mechanism can obtain the humidity at the filtering structure 2 and the humidity in the granary where the return air assembly is applied, and the humidity detection mechanism is electrically connected to the air valve structure 7 and the control device. After the cleaning of the filtering structure 2 is completed, the humidity at the filtering structure 2 and the humidity in the granary are detected and compared. If the humidity at the filtering structure 2 is less than the humidity in the granary, it indicates that the filtering structure 2 has dried and can supply air. At this time, the air valve structure 7 can be switched to the ventilation state, and at the same time, the drain port 53 is switched to the sealed state, and the return air assembly works normally. Among them, when detecting the humidity, the humidity detection at the filtering structure 2 can be replaced by the humidity detection at the drain port 53, so as to facilitate the installation and arrangement of the humidity sensor, avoid the humidity sensor from obstructing the inside of the return air duct 1, and improve the air supply effect of the return air assembly. When comparing the humidity, the humidity W of the drain port 53 and the humidity W 库 in the granary can be detected respectively, and it is judged whether (W - W 库 ) / W 库 is less than a constant K (the value range of K can be 0.01 - 0.1). If it is less, it indicates that the filtering structure 2 has been dried and the return air assembly can work normally.

[0051] The return air assembly further includes a fan, which is connected to the return air duct 1. The fan has a first state in which gas passes through the filter structure 2 in the forward direction, and the fan also has a second state in which gas passes through the filter structure 2 in the reverse direction. When the fan is in the first state, the fan can make the gas flow through the filter structure 2 to provide gas for other structures connected to the return air duct 1. When the fan is in the second state, the gas can pass through the filter structure 2 in the reverse direction. After the filter structure 2 is spray-cleaned, the fan can be switched to the second state, and at the same time, the air valve structure 7 between the filter structure 2 and the fan is opened, and the fan blows air towards the filter structure 2 to dry the filter structure 2. The gas blown out by the fan can enter the drainage chamber 5 after passing through the filter structure 2 and is finally discharged through the drain outlet 53. When the humidity of the filter structure 2 is less than the humidity of the granary, the fan can be controlled to stop, the drain outlet 53 is switched to the sealed state, and then both air valve structures 7 are switched to the ventilation state, and the return air assembly performs normal air supply work. Among them, since there is a wind speed detection mechanism in the return air assembly, when the fan performs reverse air supply, the wind speeds on both sides of the filter structure 2 can also be detected, and the difference is calculated. If the difference at this time is less than the preset value, it means that the filter structure 2 is cleaned, otherwise the filter structure 2 needs to be cleaned continuously. Figure 2 The solid arrow in the figure is the air flow direction of the forward air supply of the fan, and the dotted arrow is the air flow direction of the reverse air supply of the fan.

[0052] Specifically, in the air flow direction of the normal air supply of the return air assembly, the first wind speed detection mechanism is located on the windward side of the filter structure 2, and the second wind speed detection mechanism is located on the leeward side of the filter structure 2. When judging whether the filter structure 2 needs to be cleaned, the difference ΔS between the wind speed value S1 of the first wind speed detection mechanism and the wind speed value S2 of the second wind speed detection mechanism is calculated respectively, and then ΔS / S1 is compared with the first user-set value S. If ΔS / S1 is greater than S, it means that the filter structure 2 is seriously blocked and needs to be cleaned. After the cleaning process of the filter structure 2 is completed, S1 and S2 are detected again, and then the difference ΔS2 between S2 - S1 is compared with the second user-set value Sc. If ΔS2 / S2 is less than Sc, it means that the filter screen is cleaned, otherwise the filter screen needs to be cleaned continuously. Among them, the value range of S is 0.1 to 0.5; the value range of Sc is Sc < 0.1.

[0053] The return air duct 1 includes a first connecting section 13, a filtering section 14, and a second connecting section 15 that are connected in sequence. The filtering structure 2 is disposed in the filtering section 14. The first connecting section 13 is detachably connected to the filtering section 14, and the second connecting section 15 is detachably connected to the filtering section 14. That is, the filtering section 14 is set as a detachable part, so as to facilitate the removal of the filtering section 14 and the filtering structure 2 for convenient replacement. A damper structure 7 is disposed in the first connecting section 13, and another damper structure 7 is disposed in the second connecting section 15.

[0054] The number of the spraying structures 3 is two, and the two spraying structures 3 are respectively disposed on both sides of the filtering structure 2. The two spraying structures 3 are used to spray and clean the filtering structure 2 from two sides, improving the cleaning effect on the filtering structure 2.

[0055] As an implementation manner, the spraying structure 3 includes a spray head. The spray head is disposed on the return air duct 1, and the spraying direction of the spray head faces the filtering structure 2. The number of the spray heads can be multiple, and all the spray heads are distributed with the central axis of the return air duct 1 as the axis, so as to clean the filtering structure 2 from multiple directions and effectively improve the cleaning effect on the filtering structure 2.

[0056] Furthermore, a water inlet cavity 12 is further disposed on the return air duct 1. The cross section of the water inlet cavity 12 is annular, and all the spray heads on the same spraying structure 3 are communicated with the water inlet cavity 12 to ensure the water supply for all the spray heads.

[0057] An air conditioner unit for a granary includes the above-mentioned return air assembly.

[0058] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A return air assembly, characterized in that: include: Return air duct (1); A filter structure (2), wherein the filter structure (2) is arranged in the return air duct (1); A spray structure (3), wherein the spray structure (3) is arranged in the return air duct (1), and the spray direction of the spray structure (3) is toward the filter structure (2); A driving mechanism (4), the driving mechanism (4) is drivingly connected to the filtering structure (2), and the driving mechanism (4) can drive the filtering structure (2) to rotate.

2. The return air assembly according to claim 1, characterized in that: The return air duct (1) is formed with a drainage cavity (5), the drainage cavity (5) is located on the peripheral side of the filter structure (2), and the return air duct (1) is provided with a drainage hole (11), and the interior of the return air duct (1) is connected to the drainage cavity (5) through the drainage hole (11).

3. The return air assembly according to claim 2, characterized in that: The return air assembly further comprises a drainage structure, wherein the drainage structure is arranged on the return air duct (1), and the drainage structure and the return air duct (1) together form the drainage cavity (5).

4. The return air assembly according to claim 2, characterized in that: The cross section of the drainage cavity (5) is annular, and the rotation axis of the filtering structure (2) is colinear with the central axis of the drainage cavity (5).

5. The return air assembly according to claim 2, characterized in that: The return air assembly further comprises a first partition plate (6), the first partition plate (6) being arranged in the drainage cavity (5), and the first partition plate (6) and the filtering structure (2) being in the same plane, the first partition plate (6) dividing the drainage cavity (5) into a first drainage portion (51) and a second drainage portion (52) along the air flow direction of the return air duct (1), the first drainage portion (51) and the second drainage portion (52) both being connected to the interior of the return air duct (1) through the corresponding drainage holes (11).

6. The air return assembly according to claim 2, characterized in that: The drainage cavity (5) is provided with a drainage port (53), and the drainage port (53) has a drainage state in which the drainage cavity (5) is opened, and a sealing state in which the drainage cavity (5) is closed.

7. The air return assembly according to claim 1, characterized in that: The return air assembly also includes a control device, and the spray structure (3) and the drive mechanism (4) are both electrically connected to the control device.

8. The air return assembly according to claim 7, characterized in that: Air valve structures (7) are provided on both sides of the filtering structure (2); the air valve structure (7) has a closed state for closing the return air duct (1) and a ventilated state for opening the return air duct (1); and the air valve structure (7) is electrically connected to the control device.

9. The air return assembly according to claim 7 or 8, characterized in that: The return air component also includes a wind speed detection mechanism, which is capable of obtaining wind speed values ​​on both sides of the filter structure (2), and the wind speed detection mechanism is electrically connected to the control device.

10. The air return assembly according to claim 7 or 8, characterized in that: The return air component also includes a humidity detection mechanism, which is capable of obtaining the humidity at the filter structure (2) and the humidity in the grain silo where the return air component is used, and the humidity detection mechanism is electrically connected to the air valve structure (7) and the control device.

11. The air return assembly according to claim 1, characterized in that: The return air component also includes a fan, which is connected to the return air duct (1), and has a first state for allowing gas to pass through the filter structure (2) in a forward direction, and a second state for allowing gas to pass through the filter structure (2) in a reverse direction.

12. The air return assembly according to claim 1, characterized in that: The return air duct (1) comprises a first connecting section (13), a filtering section (14) and a second connecting section (15) which are connected in sequence, the filtering structure (2) is arranged in the filtering section (14), the first connecting section (13) is detachably connected to the filtering section (14), and the second connecting section (15) is detachably connected to the filtering section (14).

13. The air return assembly according to claim 1, characterized in that: The number of the spray structures (3) is two, and the two spray structures (3) are respectively arranged on both sides of the filtering structure (2).

14. The air return assembly according to claim 1, characterized in that: The spray structure (3) comprises a spray head, which is arranged on the return air duct (1), and the spray direction of the spray head is toward the filter structure (2).

15. An air conditioning unit for a granary, characterized in that: The invention comprises the return air assembly according to any one of claims 1 to 14.

Images