A rectifying net assembly, a fan and an oil fume treatment device

Abstract

The utility model discloses a rectifier net subassembly, fan and oil fume treatment equipment belongs to kitchen appliance technical field. The rectifier net subassembly includes rectifier net main part and center rectification cover, is set up with a center through -hole and a plurality of first ventilation hole on rectifier net main part, and a plurality of first ventilation hole spreads out the area except center through -hole of rectifier net main part, center rectification cover covers and sets up at center through -hole, and center rectification cover is detachably connected with rectifier net main part, and a plurality of second ventilation hole is arranged on center rectification cover, and the top surface height of center rectification cover is higher than the top surface of rectifier net main part. Center rectification cover guarantees normal ventilation on one hand, on the other hand, center rectification cover and rectifier net main part exist height difference, can make the airflow that enters the impeller center compare the main stream and advance rectification, thereby weakens the vortex near the center, improves airflow flow uniformity, not only has realized rectification, can also reduce the aerodynamic noise, has promoted the performance and user experience of oil fume treatment equipment.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a rectifier mesh assembly, a fan, and an oil fume treatment device. Background Technology

[0002] Cooking fumes produced in the kitchen have a direct impact on the living environment and user health. Fume treatment equipment is a type of kitchen appliance used to purify the kitchen environment. Its main function is to absorb and exhaust these fumes during cooking, thereby purifying indoor air and maintaining a healthy kitchen environment. Existing fume treatment equipment includes ductwork components and a fume collection chamber. The ductwork component mainly consists of a fan. The fan generates airflow, creating a negative pressure zone within a certain space above the stove. This draws the indoor fumes into the ductwork component through the fume collection chamber, and the fumes are then discharged outdoors with the airflow.

[0003] As a core component of fume extraction equipment, the noise generated by the fan directly impacts the user's cooking experience. Furthermore, the width of the airflow channels within the fume extraction equipment directly affects its noise level; narrower channels result in higher noise levels. Due to kitchen space limitations, slim fume extraction devices are becoming increasingly popular. However, these devices often have narrower internal airflow channels, leading to unstable airflow in the fan. This not only reduces efficiency but also generates significant noise.

[0004] In the design of thin-film fume treatment equipment, due to the shape and space limitations of centrifugal fans, the air intake rectification needs to adapt to different spatial conditions. Vortexes often exist near the impeller center. Existing patented technologies, such as patent CN217928935U, only provide a single rectifying mesh, which results in ineffective rectification of the airflow at the impeller inlet center. Especially during high-temperature cooking, the airflow cannot be evenly distributed, affecting the performance of the centrifugal fan. While patent CN118935477A incorporates a guide surface at the air inlet, its impermeability allows it to guide but not rectify airflow, thus failing to reduce noise at the impeller inlet.

[0005] Therefore, there is an urgent need to design a rectifier grid assembly, a fan, and an oil fume treatment device to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of this invention is to provide a rectifier mesh assembly, a fan, and an oil fume treatment device that can not only rectify the airflow at the center of the impeller inlet but also effectively reduce noise.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A rectifier grid assembly, comprising:

[0009] A rectifier mesh body, wherein the rectifier mesh body has a central through hole and a plurality of first ventilation holes, the plurality of first ventilation holes covering the area of ​​the rectifier mesh body excluding the central through hole; and...

[0010] A central rectifier cover is provided covering the central through hole. The central rectifier cover is detachably connected to the rectifier mesh body. Multiple second ventilation holes are arranged in an array on the central rectifier cover. The top surface of the central rectifier cover is higher than the top surface of the rectifier mesh body.

[0011] As an optional technical solution for the above-mentioned rectifier mesh assembly, the main body of the rectifier mesh has a planar structure, the central rectifier cover includes a top cover and a surrounding wall arranged around the top cover, the surrounding wall is detachably connected to the main body of the rectifier mesh, the top cover has a planar structure, and the top cover protrudes from the main body of the rectifier mesh so that the top surface of the top cover is higher than the top surface of the main body of the rectifier mesh.

[0012] As an optional technical solution for the above-mentioned rectifier mesh component, the enclosure includes an arc-shaped portion and a straight portion. One end of the arc-shaped portion is smoothly connected to the top cover, and the other end is smoothly connected to the straight portion. The straight portion is detachably connected to the rectifier mesh body.

[0013] As an optional technical solution for the above-mentioned rectifier mesh assembly, the straight portion is provided with at least two pins along the circumferential direction, and the central through hole of the rectifier mesh body is provided with at least two L-shaped baffles, and all the pins can be engaged with all the baffles one by one.

[0014] As an optional technical solution for the above-mentioned rectifier mesh component, the shape of the first ventilation hole and the shape of the second ventilation hole may be the same or different;

[0015] The size of the first ventilation hole and the size of the second ventilation hole may be the same or different.

[0016] As an optional technical solution for the above-mentioned rectifier mesh component, both the first ventilation hole and the second ventilation hole are regular hexagonal holes;

[0017] All the first ventilation holes are arranged in a honeycomb pattern on the main body of the rectifier mesh; all the second ventilation holes are arranged in a honeycomb pattern on the central rectifier cover.

[0018] As an optional technical solution for the aforementioned rectifier mesh component, a third ventilation hole is provided around the perimeter of the enclosure.

[0019] As an optional technical solution for the above-mentioned rectifier mesh assembly, at least two third ventilation holes are provided, and all the third ventilation holes are evenly arranged along the circumferential direction of the central rectifier cover.

[0020] This utility model also provides a fan, including the above-mentioned rectifier mesh assembly, wherein the rectifier mesh assembly is installed at the front air inlet and / or the rear air inlet of the fan.

[0021] This utility model also provides an oil fume treatment device, including the aforementioned fan.

[0022] Compared with the prior art, the beneficial effects of this utility model include at least the following:

[0023] The rectifier mesh assembly disclosed in this utility model includes a rectifier mesh body and a central rectifier cover. The rectifier mesh body has a central through hole and multiple first ventilation holes, which cover the area of ​​the rectifier mesh body excluding the central through hole. The central rectifier cover is disposed over the central through hole and is detachably connected to the rectifier mesh body. The central rectifier cover has multiple second ventilation holes arranged in an array, and its top surface is higher than that of the rectifier mesh body. With this structure, the central rectifier cover ensures normal ventilation. Furthermore, the height difference between the central rectifier cover and the rectifier mesh body allows the airflow entering the impeller center to be rectified earlier than the mainstream, thereby weakening the vortex near the center and improving the uniformity of airflow. This not only rectifies the airflow at the impeller inlet center but also effectively reduces aerodynamic noise, improving the performance of the fume treatment equipment and the user experience.

[0024] The fan disclosed in this utility model includes the aforementioned rectifier mesh assembly, which is installed at the front air inlet and / or rear air inlet of the fan. This fan exhibits low aerodynamic noise and provides a good user experience.

[0025] The oil fume treatment equipment disclosed in this utility model includes the aforementioned fan. This oil fume treatment equipment has low aerodynamic noise and provides a good user experience. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the fan of the fume treatment equipment provided in a specific embodiment of this utility model;

[0028] Figure 2 This is a cross-sectional view of the sorting mesh assembly and impeller provided in a specific embodiment of this utility model;

[0029] Figure 3This is a schematic diagram of the structure of the rectifier grid assembly provided in a specific embodiment of this utility model;

[0030] Figure 4 This is a schematic diagram of the structure of the rectifier grid body provided in a specific embodiment of this utility model;

[0031] Figure 5 This is a schematic diagram of the structure of the central rectifier cover provided in a specific embodiment of this utility model;

[0032] Figure 6 This is a cross-sectional view of the center rectifier cover and nut provided in a specific embodiment of this utility model;

[0033] Figure 7 This is a partial structural schematic diagram of the rectifier grid body provided in a specific embodiment of this utility model.

[0034] In the picture:

[0035] 100. Rectifier mesh assembly; 200. Fan; 201. Impeller; 202. Motor bearing; 203. Nut;

[0036] 1. Rectifier mesh body; 11. Central through hole; 12. First ventilation hole; 13. Baffle strip; 14. Mounting edge;

[0037] 2. Central rectifier cover; 21. Top cover; 22. Enclosure; 23. Insert; 211. Second ventilation hole; 221. Arc-shaped part; 222. Straight part; 223. Third ventilation hole. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0039] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0044] This embodiment discloses an oil fume treatment device, which can be any type of device with oil fume treatment function, such as a top-mounted range hood, a side-suction range hood, or a top-suction range hood. All types of devices with oil fume treatment function are within the protection scope of this embodiment. This embodiment uses a top-mounted range hood as an example to describe the structure of the oil fume treatment device.

[0045] The fume treatment equipment includes a duct assembly and a smoke collection chamber, with the smoke collection chamber located below and connected to the duct assembly. For example... Figure 1 As shown, the air duct assembly includes a casing and a fan 200 installed inside the casing. When in use, the fan 200 operates, creating a negative pressure zone in a certain space above the stove, drawing indoor fumes into the air duct assembly through the smoke collection chamber, and then expelling the fumes outdoors through the pipes.

[0046] like Figure 1 and Figure 2 As shown, the fan 200 mainly includes a volute, an impeller 201 housed within the volute, and an impeller motor. Air inlets are formed on opposite sides of the volute, namely a front air inlet and a rear air inlet. A rectifier mesh assembly 100 is installed at the front air inlet and / or the rear air inlet. The air inlets on both sides are coaxially arranged with the impeller 201. This fan 200 is a centrifugal fan.

[0047] like Figures 3 to 5 As shown, the rectifier mesh assembly 100 in this embodiment includes a rectifier mesh body 1 and a central rectifier cover 2. The rectifier mesh body 1 has a central through hole 11 and a plurality of first ventilation holes 12, which cover the area of ​​the rectifier mesh body 1 except for the central through hole 11. The central rectifier cover 2 is disposed on the central through hole 11 and is detachably connected to the rectifier mesh body 1. A plurality of second ventilation holes 211 are arranged in an array on the central rectifier cover 2, and the top surface of the central rectifier cover 2 is higher than the top surface of the rectifier mesh body 1.

[0048] Under the above structure, the central rectifier cover 2 ensures normal ventilation on the one hand, and on the other hand, since the top surface of the central rectifier cover 2 is higher than the top surface of the rectifier mesh body 1, there is a height difference between the central rectifier cover 2 and the rectifier mesh body 1. This allows the airflow entering the center of the impeller 201 to be rectified earlier than the mainstream, thereby weakening the vortex near the center and improving the uniformity of airflow. It can not only rectify the airflow at the inlet center of the impeller 201, but also effectively reduce aerodynamic noise, improve the performance of the fume treatment equipment and the user experience.

[0049] Specifically, the main body 1 of the rectifier grid has a planar structure, such as... Figure 6 As shown, the central rectifier cover 2 includes a top cover 21 and a surrounding wall 22 encircling the top cover 21. The surrounding wall 22 is detachably connected to the rectifier mesh body 1. The top cover 21 has a planar structure and protrudes from the rectifier mesh body 1, so that the top surface of the top cover 21 is higher than the top surface of the rectifier mesh body 1. In this structure, along the direction away from the impeller 201, the top surface of the top cover 21 protrudes from the top surface of the rectifier mesh body 1. The height difference between the two allows the airflow entering the central part of the impeller 201 to be rectified earlier than the mainstream, which can effectively optimize the airflow at the central air inlet of the impeller 201, reduce aerodynamic noise, and improve the working efficiency of the fume treatment equipment.

[0050] Furthermore, the enclosure 22 includes an arc-shaped portion 221 and a straight portion 222. One end of the arc-shaped portion 221 is smoothly connected to the top cover 21, and the other end is smoothly connected to the straight portion 222. The straight portion 222 is detachably connected to the main body 1 of the rectifier mesh. The smoothly connected structure can improve the structural strength and impact resistance of the central rectifier cover 2, reduce the impact of high-speed airflow on the central rectifier cover 2, thereby extending the service life of the central rectifier cover 2. At the same time, it can also effectively eliminate the turning lines on the central rectifier cover 2, allowing the airflow to flow smoothly, thereby significantly reducing airflow resistance.

[0051] The connection point between the arc-shaped portion 221 and the top cover 21 is the first tangent point, and the connection point between the arc-shaped portion 221 and the straight portion 222 is the second tangent point.

[0052] To increase airflow and reduce airflow resistance, this embodiment improves the existing method of fixing the impeller 201 to the impeller motor. Specifically, the existing impeller cap is eliminated, and the impeller 201 passes through the motor bearing 202 of the impeller motor and is fixed with a nut 203. Compared to the impeller cap, the nut 203 is smaller in height, width, and other dimensions, resulting in a more compact size. Therefore, the gap and space between the nut 203 and the central rectifier cover 2 are increased, allowing more airflow to enter the center of the impeller 201.

[0053] Optionally, the threads on the motor bearing 202 are the same as those on the nut 203, both being reverse-threaded M8 threads. Of course, the thread size is not limited to this and can be selected according to the actual situation.

[0054] In this embodiment, such as Figure 6 As shown, the outer length of nut 203 is D, and the distance between the inner surface of top cover 21 and the end face of nut 203 is L. To ensure sufficient airflow space between top cover 21 and nut 203, where L = (0.7-0.9)D; the distance between the top center of nut 203 and the first tangent point is r1, and the distance between the top center of nut 203 and the second tangent point is r2, where r1 satisfies... 2 =L 2 +D 2 r2 = (1.1~1.5)r1. The thickness of the rectifier mesh body 1 is δ, the distance between the inner surface of the straight part 222 and the central rotation axis of the central rectifier cover 2 is d1, and the maximum distance between the central rotation axis and the rectifier mesh body 1 is d2. d1 and d2 satisfy the relationship: d2-d1-δ≤2.5mm.

[0055] In this embodiment, the detachable connection between the central rectifier cover 2 and the rectifier mesh body is a snap-fit ​​connection. In other embodiments, the detachable connection between the central rectifier cover 2 and the rectifier mesh body is not limited to a snap-fit ​​connection, but can also be other structures capable of achieving a detachable connection. Specifically, such as... Figure 6 and Figure 7 As shown, the straight part 222 is provided with at least two pins 23 along the circumferential direction, and at least two L-shaped baffles 13 are provided at the central through hole 11 of the rectifier mesh body 1. All pins 23 can be engaged with all baffles 13 in a one-to-one correspondence, thereby realizing the fixation of the central rectifier cover 2 and the rectifier mesh body.

[0056] To facilitate the installation of the center rectifier cover 2, the pin 23 extends radially along the center rectifier cover 2. A retaining strip 13 is provided on the back of the center through hole 11 of the rectifier mesh body. When the center rectifier cover 2 is installed in the center through hole 11, rotating the center rectifier cover 2 causes the pin 23 to rotate into the L-shaped retaining strip 13, thus achieving the snap-fit ​​fixation between the center rectifier cover 2 and the rectifier mesh body. This detachable connection structure is simple in structure and convenient in operation, enabling quick assembly and disassembly of the center rectifier cover 2 and the rectifier mesh body.

[0057] Optionally, all pins 23 are evenly spaced along the circumferential direction on the straight portion 222, and the baffles 13 are evenly spaced along the circumferential direction on the rectifier mesh body, and are snapped together one by one. The cooperation of multiple snap-fit ​​structures can improve the uniformity of the connection force between the central rectifier cover 2 and the rectifier mesh body, thereby improving the connection stability and connection strength of the rectifier mesh assembly 100 after assembly.

[0058] To facilitate the installation of the baffle 13, such as Figure 4 As shown, the central through hole 11 is surrounded by protruding mounting edges 14. The number of mounting edges 14 is the same as the number of baffles 13, and the baffles 13 are located on the back of the mounting edges 14. By setting the mounting edges 14, it is not only convenient to set the baffles 13, but also to improve the connection strength between the rectifier mesh body 1 and the central rectifier cover 2.

[0059] The shape of the first ventilation hole 12 and the shape of the second ventilation hole 211 can be the same or different; the size of the first ventilation hole 12 and the size of the second ventilation hole 211 can also be the same or different. The design can be based on the actual situation.

[0060] Optionally, the shape of the first ventilation hole 12 and the second ventilation hole 211 can be a polygonal hole, a circular hole, an oblong hole, etc. In this embodiment, it is set as a polygonal hole. The opening ratio can be set according to specific circumstances, as long as it can achieve the purpose of noise reduction.

[0061] In this embodiment, both the first ventilation hole 12 and the second ventilation hole 211 are regular hexagonal holes; all the first ventilation holes 12 are arranged in a honeycomb pattern on the main body 1 of the rectifier mesh; all the second ventilation holes 211 are arranged in a honeycomb pattern on the central rectifier cover 2. The symmetry and high filling rate of the regular hexagon can uniformly divide the airflow, disrupt large-scale eddies, and at the same time ensure the structural strength of the main body 1 of the rectifier mesh and the central rectifier cover 2. The array distribution of all the first ventilation holes 12 and all the second ventilation holes 211 can improve the uniformity of airflow without affecting the air intake, and the noise reduction effect is obvious.

[0062] Furthermore, a third ventilation hole 223 is provided around the perimeter of the enclosure 22. This structure can increase the air intake and improve the uniformity of airflow.

[0063] Optionally, at least two third ventilation holes 223 are provided, and all third ventilation holes 223 are evenly arranged along the circumferential direction of the central rectifier cover 2. This structure can further improve the uniformity of the intake airflow.

[0064] Furthermore, the pin 23 is offset from the third ventilation hole 223, that is, the pin 23 is not set on the wall 22 where the third ventilation hole 223 is set. This ensures that the part of the wall 22 corresponding to the pin 23 is a solid piece, thereby ensuring the structural strength of the wall 22 and thus ensuring the reliability of the connection between the central rectifier cover 2 and the rectifier mesh body.

[0065] In this embodiment, the number of pins 23 and third ventilation holes 223 is the same, and all pins 23 and all third ventilation holes 223 are alternately arranged in the circumferential direction. For example, there are six pins 23 and six third ventilation holes 223, which are alternately arranged in the circumferential direction. Of course, the number of pins 23 and third ventilation holes 223 is not limited to six; the specific number can be selected according to the actual situation.

[0066] In this embodiment, both the front air inlet and the rear air inlet are provided with the above-mentioned rectifier mesh assembly 100, and the rectifier mesh assembly 100 of the front air inlet and the rectifier mesh assembly 100 of the rear air inlet are installed symmetrically, so that the airflow enters the fan 200 from the two air inlets evenly, which is beneficial to improving the air intake and exhaust efficiency of the fan 200.

[0067] Since the fan 200 and the fume treatment equipment provided in this embodiment include the aforementioned rectifier mesh assembly 100, the technical advantages and effects that the fan 200 and the fume treatment equipment can achieve also include the technical advantages and effects that the aforementioned rectifier mesh assembly 100 can achieve, and will not be repeated here.

[0068] Obviously, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0069] Note that in the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A rectifier grid assembly, characterized in that, include: A rectifier mesh body (1) has a central through hole (11) and a plurality of first ventilation holes (12) on it, the plurality of first ventilation holes (12) covering the area of ​​the rectifier mesh body (1) except for the central through hole (11); and, A central rectifier cover (2) is provided on the central through hole (11). The central rectifier cover (2) is detachably connected to the rectifier mesh body (1). A plurality of second ventilation holes (211) are arranged in an array on the central rectifier cover (2). The top surface of the central rectifier cover (2) is higher than the top surface of the rectifier mesh body (1).

2. The rectifier grid assembly according to claim 1, characterized in that, The main body (1) of the rectifier mesh has a planar structure. The central rectifier cover (2) includes a top cover (21) and a surrounding wall (22) arranged around the top cover (21). The surrounding wall (22) is detachably connected to the main body (1) of the rectifier mesh. The top cover (21) has a planar structure and protrudes from the main body (1) of the rectifier mesh, so that the top surface of the top cover (21) is higher than the top surface of the main body (1) of the rectifier mesh.

3. The rectifier grid assembly according to claim 2, characterized in that, The enclosure (22) includes an arc-shaped part (221) and a straight part (222). One end of the arc-shaped part (221) is smoothly connected to the top cover (21), and the other end is smoothly connected to the straight part (222). The straight part (222) is detachably connected to the main body of the rectifier mesh (1).

4. The rectifier grid assembly according to claim 3, characterized in that, The straight section (222) is provided with at least two pins (23) along the circumferential direction, and the main body of the rectifier mesh (1) is provided with at least two L-shaped baffles (13) at the central through hole (11), and all the pins (23) can be engaged with all the baffles (13) one by one.

5. The rectifier grid assembly according to claim 1, characterized in that, The shape of the first ventilation hole (12) may be the same as or different from the shape of the second ventilation hole (211); The size of the first ventilation hole (12) may be the same as or different from the size of the second ventilation hole (211).

6. The rectifier grid assembly according to claim 5, characterized in that, Both the first ventilation hole (12) and the second ventilation hole (211) are regular hexagonal holes; All the first ventilation holes (12) are arranged in a honeycomb pattern on the main body of the rectifier mesh (1); all the second ventilation holes (211) are arranged in a honeycomb pattern on the central rectifier cover (2).

7. The rectifier grid assembly according to claim 2, characterized in that, The enclosure (22) has a third ventilation hole (223) around its perimeter.

8. The rectifier grid assembly according to claim 7, characterized in that, At least two third ventilation holes (223) are provided, and all the third ventilation holes (223) are evenly arranged along the circumferential direction of the central rectifier cover (2).

9. A fan, characterized in that, Includes a rectifier mesh assembly (100) as described in any one of claims 1-8, the rectifier mesh assembly (100) being installed at the front air inlet and / or the rear air inlet of the fan (200).

10. An oil fume treatment device, characterized in that, Includes the fan (200) as described in claim 9.

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