Self-cleaning air inlet protection device and air handling unit

Abstract

This utility model relates to a self-cleaning air inlet protection device and an air handling unit, including a main body assembly and a self-cleaning assembly. The main body assembly includes a first connecting member, a second connecting member, and a protective net. Both the first and second connecting members are cylindrical and connected by a snap-fit ​​structure. The protective net is hemispherical and connects to the second connecting assembly. The self-cleaning assembly includes multiple support rods, a drive shaft, an impeller, and a cleaning brush. The impeller drives the cleaning brush via the drive shaft to clean the convex surface of the protective net. This utility model's self-cleaning air inlet protection device can prevent debris from adhering and is easy to install and disassemble.

Description

Technical Field

[0001] This utility model relates to the field of ventilation technology, and in particular to a self-cleaning air inlet protection device and an air handling unit. Background Technology

[0002] Air handling units (ALUs) are typically placed outdoors, and their air inlets require protective nets to prevent small animals or large debris from entering the equipment and causing damage or internal contamination. Traditional protective nets are flat metal meshes, fixedly installed at the unit's air inlet. Because these flat inlet nets operate under negative pressure, drawing air inwards, dust storms can easily cause debris like dry grass to accumulate on them. Especially since the equipment is usually running 24 / 7, this accumulation of debris can clog the air inlet, increasing energy consumption and potentially causing damage. Furthermore, installing and removing traditional protective nets usually requires specialized tools, making them inconvenient. Therefore, there is an urgent need for a new type of protective device that prevents debris accumulation and is easy to install and remove. Utility Model Content

[0003] Therefore, this utility model provides a self-cleaning air inlet protection device and an air handling unit, which can prevent the accumulation of debris and is easy to install and disassemble.

[0004] To solve the above-mentioned technical problems, this utility model provides a self-cleaning air inlet protection device, comprising: The main body assembly includes a first connector, a second connector, and a protective net. The first connector is cylindrical and has a head end and a tail end in the length direction. The head end of the first connector is used to connect with an air vent. The second connector is cylindrical and has a head end and a tail end in the length direction. The head end of the second connector is connected to the tail end of the first connector. The protective net is hemispherical and is connected to the tail end of the second connector to block foreign objects from passing through.

[0005] The self-cleaning assembly includes multiple support rods, a drive shaft, a drive unit, and a cleaning brush. The multiple support rods are located inside the second connector and extend radially along the second connector. The multiple support rods are connected to the second connector and converge at the center of the second connector. The drive shaft is coaxial with the second connector and rotatably connected to the convergence point of the multiple support rods. The drive shaft has a head end and a tail end in the length direction. The tail end of the drive shaft extends to the outer convex side of the protective net. The drive unit is located at the head end of the drive shaft and is used to drive the drive shaft to rotate. The cleaning brush is arc-shaped, connected to the tail end of the drive shaft, and conforms to the outer convex side of the protective net.

[0006] Furthermore, the tail end of the first connector is provided with a first alignment structure, and the head end of the second connector is provided with a second alignment structure. The second alignment structure and the first alignment structure are interlocked and attracted to each other so that the second connector and the first connector are aligned with each other.

[0007] Furthermore, the first alignment structure is a first step structure provided on the outer side of the tail end of the first connector, and the second alignment structure is a second step structure provided on the inner side of the head end of the second connector. A magnetic ring is provided on the shoulder of the second step structure, the tail end of the first connector extends into the inner side of the head end of the second connector, and the shoulder of the first step structure and the magnetic ring are attracted to each other.

[0008] Furthermore, several buckles are provided on the outer side walls of the first and second connectors, and the first and second connectors are detachably connected by the buckles.

[0009] Furthermore, the tail end of the second connector is provided with a first threaded structure, and the annular edge of the protective net is provided with a second threaded structure, the second threaded structure being threadedly connected to the first threaded structure.

[0010] Furthermore, the mesh of the protective net is diamond-shaped.

[0011] Furthermore, the driving component includes an annular impeller, the inner wall of which is fixedly connected to a coaxial support frame, the center of which is fixedly connected to the beginning of the transmission shaft, and the outer wall of which is fixedly connected to a plurality of ring-shaped blades that are equidistantly arranged.

[0012] In another embodiment, the driving component includes a motor and a miniature wind speed transmitter. The motor housing and the miniature wind speed transmitter are both fixedly connected to the support rod. The output end of the motor is fixedly connected to the beginning end of the transmission shaft, and the miniature wind speed transmitter is electrically connected to the motor.

[0013] Furthermore, the main body assembly also includes multiple support bars, which are arc-shaped and conform to the concave side of the protective net. The multiple support bars are connected to the second connector and converge at the apex of the protective net. The drive shaft rotatably passes through and connects the convergence of the multiple support bars.

[0014] This utility model also provides an air handling unit, wherein the self-cleaning air inlet protection device is detachably installed on the outside of the air inlet of the air handling unit.

[0015] Compared with the prior art, the above-mentioned technical solution of this utility model has the following advantages: First, the hemispherical protective net, through its spatial curved surface design, transforms planar force into spatially dispersed force, while simultaneously using the arc surface to guide airflow and debris movement, thus solving the problems of insufficient strength of planar structures, easy accumulation of debris, and high airflow resistance; Second, the outer cleaning brush is driven by the drive component and transmission shaft, which can remove adhering dry grass and other blockages on the outer surface of the protective net during equipment operation; Third, the first connecting piece is fixed to the air outlet, and the second connecting piece is quickly detached from the first connecting piece, enabling rapid assembly and disassembly of the self-cleaning air inlet protective device; The first alignment structure and the second alignment structure enable rapid alignment of the first connecting piece and the second connecting piece, facilitating precise connection of the first connecting piece and the second connecting piece, and improving the connection stability between the first connecting piece and the second connecting piece. Attached Figure Description

[0016] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the self-cleaning air inlet protection device disclosed in Embodiment 1 of this utility model. Figure 2 This is an assembly diagram of the self-cleaning air inlet protection device disclosed in Embodiment 1 of this utility model from the first angle. Figure 3 This is an assembly diagram from the second angle of the self-cleaning air inlet protection device disclosed in Embodiment 1 of this utility model; Figure 4 This is an assembly diagram from the third angle of the self-cleaning air inlet protection device disclosed in Embodiment 1 of this utility model; Figure 5 This is an assembly diagram of the self-cleaning air inlet protection device disclosed in Embodiment 2 of this utility model; Figure 6 This is a schematic diagram of the air handling unit disclosed in Embodiment 3 of this utility model.

[0018] Explanation of reference numerals in the accompanying drawings: A. Self-cleaning air inlet protection device; 1. First connector; 11. First alignment structure; 13. Bolt hole; 2. Second connector; 21. Second alignment structure; 22. Buckle; 23. Magnetic ring; 24. First threaded structure; 3. Protective net; 4. Support rod; 5. Drive shaft; 6. Drive component; 61. Annular impeller; 62. Support frame; 63. Blade; 64. Motor; 65. Miniature wind speed transmitter; 7. Cleaning brush; 8. Support bar; B. Sand removal section; C. Fan section. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0020] Example 1: See Figures 1 to 4 The image shows an embodiment of the self-cleaning air inlet protection device provided by this utility model.

[0021] Self-cleaning air inlet protection devices include: The main body assembly includes a first connector 1, a second connector 2, and a protective net 3. The first connector 1 is cylindrical and has a head end and a tail end along its length. The head end of the first connector 1 is used to connect with an air vent, and the tail end of the first connector 1 is provided with a first alignment structure 11. The second connector 2 is cylindrical and has a head end and a tail end along its length. The head end of the second connector 2 is connected to the tail end of the first connector 1, and the head end of the second connector 2 is provided with a second alignment structure 21. The second alignment structure 21 and the first alignment structure 11 are interlocked and attracted to each other to align the second connector 2 with the first connector 1. Several fasteners 22 are also provided on the outer walls of the first connector 1 and the second connector 2, and the first connector 1 and the second connector 2 are detachably connected by the fasteners 22. The protective net 3 is hemispherical and is connected to the tail end of the second connector 2 to block the passage of foreign objects. The self-cleaning assembly includes multiple support rods 4, a drive shaft 5, a drive unit 6, and a cleaning brush 7. The multiple support rods 4 are located inside the second connector 2 and extend radially along the second connector 2. The multiple support rods 4 are connected to the second connector 2 and converge at the center of the second connector 2. The drive shaft 5 is coaxial with the second connector 2 and rotatably connected to the convergence of the multiple support rods 4. The drive shaft 5 has a head end and a tail end in the length direction. The tail end of the drive shaft 5 extends to the outer convex side of the protective net 3. The drive unit 6 includes an annular impeller 61. A coaxial support frame 62 is fixedly connected to the inner wall of the annular impeller 61. The center of the support frame 62 is fixedly connected to the head end of the drive shaft 5. A plurality of ring-shaped and equidistantly arranged blades 63 are fixedly connected to the outer wall of the annular impeller 61. The cleaning brush 7 is arc-shaped, connected to the tail end of the drive shaft 5, and conforms to the outer convex side of the protective net 3.

[0022] In the above text, both the first connecting member 1 and the second connecting member 2 are cylindrical components. The first and second ends of the first connecting member 1 are its two cylindrical opening positions, and the first and second ends of the second connecting member 2 are its two cylindrical opening positions. The first alignment structure 11 is located at the cylindrical opening position where the first connecting member 1 and the second connecting member 2 connect. The second alignment structure 21 is located at the cylindrical opening position where the second connecting member 2 and the first connecting member 1 connect. The second alignment structure 21 and the first alignment structure 11 complement each other, so that the positions of the first connecting member 1 and the second connecting member 2 are aligned. The fastener 22 allows for quick-release snap-fit, so that the first connecting member 1 and the second connecting member 2 can maintain their preset relative positions even when subjected to external force after being connected. The hemispherical shape refers to the protective net 3 having an outwardly convex hemispherical curved surface structure, similar to an open umbrella canopy. The support rod 4 is a strip-shaped structure extending from the inside of the second connecting member 2 towards the center, used to provide stable support for the drive shaft 5. The drive shaft 5 is a rotating shaft that passes through the intersection of the support rods 4, used to transmit rotational power and connect the annular impeller 61 and the cleaning brush 7. The annular impeller 61 is connected to the cleaning brush 7 via the drive shaft 5 and can be rotated by the airflow generated by the air handling unit's own fan. The cleaning brush 7 is a scraping component attached to the outer surface of the protective net 3. It can be made of nylon and carbon fiber, which is resistant to hay entanglement and UV aging, and is used to scrape away blockages on the outer surface of the protective net 3.

[0023] Specifically, the first connector 1 and the second connector 2 are quick-release connected. The first connector 1 forms a stable connection with the air vent. When replacing or maintaining the self-cleaning air inlet protection device, the first connector 1 does not need to be removed; only the second connector 2 needs to be quickly detached from the first connector 1. During installation, firstly, the second alignment structure 21 and the first alignment structure 11 are aligned to quickly align the first connector 1 and the second connector 2. Then, the snap-fit ​​structure engages to fix the first connector 1 and the second connector 2 relatively in place.

[0024] This invention uses a spherical mesh structure instead of a planar mesh structure. When debris adheres to the surface of the protective mesh 3, it is easier for the debris to slide off the spherical surface of the protective mesh 3. This change greatly reduces the probability that debris will adhere to the surface of the protective mesh 3 and not fall off.

[0025] When the drive shaft 5 is driven to rotate by the annular impeller 61, the tail end of the drive shaft 5 drives the cleaning brush 7 to rotate along the outer convex surface of the protective net. Utilizing the conformal fit between the curved brush body and the net surface, it continuously scrapes away impurities accumulated on the outer surface. To reduce the rotational resistance of the cleaning brush 7 and prevent insufficient driving force from the annular impeller 61, only a slight contact is required between the inner side of the cleaning brush and the surface of the protective net 3. Additionally, lubricated bearings can be installed at various connection points of the drive shaft 5 to further reduce rotational friction.

[0026] Through the above technical solution, firstly, the first connector 1 is fixed to the air outlet, and the second connector 2 is quickly connected to the first connector 1, enabling rapid assembly and disassembly of the self-cleaning air inlet protection device; the first alignment structure 11 and the second alignment structure 21 enable rapid alignment of the first connector 1 and the second connector 2, facilitating precise connection of the first connector 1 and the second connector 2, and improving the connection stability of the first connector 1 and the second connector 2; secondly, the hemispherical protective net 3, through its spatial curved surface design, transforms planar force into spatially dispersed force, while using the arc surface to guide airflow and debris movement, solving the problems of insufficient strength of planar structures, easy accumulation of debris, and high airflow resistance; thirdly, the cleaning component is synchronously driven by the transmission shaft, which can remove the blockages adhering to the outer surface of the protective net 3 during equipment operation.

[0027] In this embodiment, the first alignment structure 11 is a first step structure provided on the outer side of the tail end of the first connector 1, and the second alignment structure 21 is a second step structure provided on the inner side of the head end of the second connector 2. A magnetic ring 23 is provided on the shoulder of the second step structure. The tail end of the first connector 1 extends into the inner side of the head end of the second connector 2, and the shoulder of the first step structure and the magnetic ring 23 attract each other.

[0028] In the above description, the first step structure includes an outer surface and a shoulder surface located outside the hole of the first connector 1. Both the outer surface and the shoulder surface surround the central axis of the tail end of the first connector 1. The outer surface faces away from the central axis of the tail end of the first connector 1, and the shoulder surface is perpendicular to the central axis of the tail end of the first connector 1. The second step structure includes an inner surface and a hole shoulder surface located inside the hole of the second connector 2. Both the inner surface and the hole shoulder surface surround the central axis of the head end of the second connector 2. The inner surface faces the central axis of the head end of the second connector 2, and the hole shoulder surface is perpendicular to the central axis of the head end of the second connector 2. The magnetic ring is annular and surrounds the central axis of the head end of the second connector 2.

[0029] Specifically, when the tail end of the first connector 1 is inserted into the inner side of the head end of the second connector 2, the outer surface of the first stepped structure abuts against the inner surface of the second stepped structure, and the shoulder surface of the first stepped structure abuts against the magnetic ring 23. That is, the magnetic ring 23 is clamped between the shoulder surface of the first stepped structure and the shoulder surface of the second stepped structure. The magnetic force generated by the magnetic ring 23 magnetically attracts the first connector 1 and the second connector 2 together. This achieves the alignment of the first connector 1 and the second connector 2, facilitating subsequent snap-fit ​​connection.

[0030] Through the above technical solution, the first connector 1 and the second connector 2 are fixed by step engagement and magnetic attraction, so that the first connector 1 and the second connector 2 can be quickly and reliably aligned.

[0031] In this embodiment, the aforementioned hook and loop fastener 22 is a common stainless steel hook and loop fastener, typically comprising a hook body and a buckle body. Specifically, the tail end of the first connector 1 has at least two hook bodies evenly distributed circumferentially, and the head end of the second connector 2 has at least two buckle bodies evenly distributed circumferentially. During installation / removal, the buckle bodies are engaged / disengaged with the corresponding hook bodies to achieve quick installation / removal. Those skilled in the art should understand that this hook and loop fastener 22 is a relatively common and well-known quick-release connector; its specific structure and principle will not be elaborated upon herein.

[0032] In this embodiment, a flange ring is provided on the outer edge of the first end of the first connector 1, and a plurality of bolt holes 13 are provided on the flange ring.

[0033] In the above text, the flange ring refers to a ring-shaped connection structure. The ring-shaped structure of the flange ring can form a standardized connection with the flange interface of the equipment's air inlet, and a stable connection is achieved through evenly distributed bolt holes. The bolt holes are through holes opened on the flange ring, specifically arranged in an equidistant ring pattern. The bolt holes are used to pass bolts and fix the flange ring to the equipment's air inlet flange interface.

[0034] Specifically, the flange ring is mated to the air vent, and then the two are connected together with bolts. If the first connector is damaged or requires disassembly, it can be removed from the air vent.

[0035] The above technical solution facilitates the detachable connection between the first connector and the air outlet by using the flange ring and bolt hole fit together, taking advantage of the standardization of the flange interface and the mechanical locking characteristics of the bolt.

[0036] In this embodiment, the tail end of the second connector 2 is provided with a first threaded structure 24, and the annular edge of the protective net 3 is provided with a second threaded structure (not shown in the figure). The second threaded structure is threadedly connected to the first threaded structure 24.

[0037] In the above text, the first thread structure 24 refers to the continuous spiral protrusion or groove formed at the tail end of the second connector 2, and the second thread structure refers to the continuous spiral groove or protrusion formed at the edge of the protective net 3. The first thread structure 24 and the second thread structure mesh with each other.

[0038] Specifically, the first threaded structure 24 at the tail end of the second connector 2 and the second threaded structure on the annular edge of the protective net 3 form a threaded pair. When the protective net 3 is rotated, the second threaded structure moves along the helical trajectory of the first threaded structure 24, causing the protective net 3 to move axially closer to or further away from the second connector 2. By rotating the protective net 3 clockwise or counterclockwise, the protective net 3 and the second connector 2 can be locked or separated. It should be noted that the locking direction of the thread should be the same as the rotation direction of the cleaning brush 7 to prevent the thread from loosening due to the force generated when the cleaning brush 7 rotates.

[0039] With the above technical solution, the continuous meshing of the threaded structure allows for complete disassembly and assembly by simply rotating the protective net, reducing the number of operation steps and eliminating the need for special tools.

[0040] In this embodiment, the mesh of the protective net 3 is diamond-shaped.

[0041] In the above text, a diamond-shaped mesh refers to a quadrilateral structure composed of four sides of equal length, with the angles between adjacent sides alternating between acute and obtuse angles.

[0042] Specifically, the acute vertices of the rhomboid mesh preferentially generate a reaction force upon contact with a foreign object, forcing the object to deflect along the sliding direction of the edge, reducing the probability of penetration. The acute vertices of adjacent meshes form staggered blocking points, narrowing the effective penetration gap. The symmetry of the rhomboid units causes airflow to form parallel streamlines along the diagonal direction, reducing lateral turbulence and collisions, and minimizing local pressure fluctuations. The spherical protective mesh, employing a rhomboid grid structure, reduces the drag change caused by the change in airflow from a planar to a spherical shape.

[0043] Through the above technical solution, the diamond-shaped mesh enhances contact resistance through its sharp-angled edges, while the symmetrical diamond-shaped channels guide the airflow to form an orderly flow, overcoming the shortcomings of traditional structures that make it difficult to balance blocking efficiency and aerodynamic performance.

[0044] In this embodiment, the above-mentioned body component also includes multiple support bars 8. The support bars 8 are arc-shaped and conform to the concave side of the above-mentioned protective net 3. The multiple support bars 8 are connected to the above-mentioned second connector 2 and converge at the apex of the above-mentioned protective net 3. The above-mentioned drive shaft 5 is rotatably connected to the convergence point of the multiple support bars 8.

[0045] In the above text, multiple support bars 8 form an arc-shaped support structure, supporting the inner side of the protective net 3.

[0046] Through the above technical solution, by setting multiple support bars 8, the protective net 3 is provided with shape support, which avoids the protective net 3 from being deformed due to its own weight or external pressure, and improves the stability of the overall structure.

[0047] Example 2: See Figure 5 As shown, in another embodiment of the self-cleaning air inlet protection device provided by this utility model, the difference between this embodiment and the first embodiment is that the driving component includes a motor 64 and a miniature wind speed transmitter 65. The housing of the motor 64 and the miniature wind speed transmitter 65 are both fixedly connected to the support rod 4. The output end of the motor 64 is fixedly connected to the first end of the transmission shaft 5. The motor 64 is preferably a stepper motor or a servo motor. The miniature wind speed transmitter 65 is electrically connected to the motor 64.

[0048] Specifically, when hay clogs the protective netting 3, the miniature wind speed transmitter 65 senses a decrease in wind speed. When this speed reaches a certain threshold, the motor 64 is activated, driving the drive shaft 5 and the cleaning brush 7 to rotate. When the wind speed returns to normal, the motor 64 stops, and the cleaning brush 7 stops rotating. Compared to embodiment one, this solution eliminates the impeller assembly, resulting in lower overall airflow resistance. It also allows for on-demand operation, reducing wear on the cleaning brush 7 and the protective netting 3.

[0049] Through the above technical solution, by setting up a motor 64 and a miniature wind speed transmitter 65, the cleaning brush 7 can be started on demand using electronic control, which improves the durability and stability of the equipment.

[0050] Example 3: See Figure 6 As shown, this utility model discloses an embodiment of an air handling unit.

[0051] Located in Xinjiang, this unit is an air handling unit with a sand removal module. The air handling unit is placed outdoors, and its function is to remove sand and dust from the indoor fresh air. It includes a self-cleaning air inlet protection device A, a sand removal section B, and a fan section C. The fan section C guides the air through the sand removal section B, which removes sand and dust from the air. The self-cleaning air inlet protection device A is installed at the air inlet of the sand removal section B to prevent small animals or large debris from entering the sand removal section B.

[0052] The project is located near grasslands, where strong winds are frequent, blowing sand and hay into the air. The air handling units in this project process fresh outdoor air and deliver it indoors. Sand and small hay particles entering the air vents are intercepted by the sand removal section B, while larger hay particles are blocked by the self-cleaning air inlet protection device A to prevent clogging.

[0053] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A self-cleaning air inlet protection device, characterized in that, include: The main body assembly includes a first connector, a second connector, and a protective net. The first connector is cylindrical and has a head end and a tail end along its length. The head end of the first connector is used to connect to an air vent. The second connector is cylindrical and has a head end and a tail end along its length. The head end of the second connector is connected to the tail end of the first connector. The protective net is hemispherical and is connected to the tail end of the second connector to block foreign objects from passing through. The self-cleaning assembly includes multiple support rods, a drive shaft, a drive unit, and a cleaning brush. The multiple support rods are located inside the second connector and extend radially along the second connector. The multiple support rods are connected to the second connector and converge at the center of the second connector. The drive shaft is coaxial with the second connector and rotatably connected to the convergence point of the multiple support rods. The drive shaft has a head end and a tail end in the length direction. The tail end of the drive shaft extends to the outer convex side of the protective net. The drive unit is located at the head end of the drive shaft and is used to drive the drive shaft to rotate. The cleaning brush is arc-shaped, connected to the tail end of the drive shaft, and conforms to the outer convex side of the protective net.

2. The self-cleaning air inlet protection device according to claim 1, characterized in that, The first connector has a first alignment structure at its tail end and a second alignment structure at its head end. The second alignment structure and the first alignment structure are interlocked and attracted to each other so that the second connector and the first connector are aligned.

3. The self-cleaning air inlet protection device according to claim 2, characterized in that, The first alignment structure is a first step structure located on the outer side of the tail end of the first connector, and the second alignment structure is a second step structure located on the inner side of the head end of the second connector. A magnetic ring is provided on the shoulder of the second step structure. The tail end of the first connector extends into the inner side of the head end of the second connector, and the shoulder of the first step structure and the magnetic ring are attracted to each other.

4. The self-cleaning air inlet protection device according to claim 1, characterized in that, The first connector and the second connector are also provided with a plurality of buckles on their outer side walls, and the first connector and the second connector are detachably connected by the buckles.

5. The self-cleaning air inlet protection device according to claim 1, characterized in that, The tail end of the second connector is provided with a first threaded structure, and the annular edge of the protective net is provided with a second threaded structure, and the second threaded structure is threadedly connected to the first threaded structure.

6. The self-cleaning air inlet protection device according to claim 1, characterized in that, The mesh of the protective net is diamond-shaped.

7. The self-cleaning air inlet protection device according to claim 1, characterized in that, The driving component includes an annular impeller, with a coaxial support frame fixedly connected to the inner wall of the annular impeller. The center of the support frame is fixedly connected to the beginning of the transmission shaft, and a number of ring-shaped blades arranged at equal intervals are fixedly connected to the outer wall of the annular impeller.

8. The self-cleaning air inlet protection device according to claim 1, characterized in that, The driving component includes a motor and a miniature wind speed transmitter. The motor housing and the miniature wind speed transmitter are both fixedly connected to the support rod. The output end of the motor is fixedly connected to the first end of the transmission shaft. The miniature wind speed transmitter is electrically connected to the motor.

9. The self-cleaning air inlet protection device according to claim 1, characterized in that, The main body component also includes multiple support bars, which are arc-shaped and conform to the concave side of the protective net. The multiple support bars are connected to the second connector and converge at the apex of the protective net. The drive shaft rotatably passes through and connects the convergence of the multiple support bars.

10. An air handling unit, characterized in that, The air handling unit is detachably equipped with a self-cleaning air inlet protection device as described in any one of claims 1-9 on the outside of the air inlet.

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