Cabinet body air inlet filtering structure and cabinet

Abstract

The invention discloses a cabinet body air inlet filtering structure and a cabinet, the cabinet body is provided with an air inlet, the filtering structure comprises a protective cover suitable for being fixedly connected to the cabinet body, the protective cover is provided with a first opening facing downwards, and an air inlet channel suitable for communicating the first opening and the air inlet is formed; the filtering assembly is fixedly arranged on the protective cover and located in the air inlet channel, the filtering assembly comprises a first filtering piece, a second filtering piece and a third filtering piece which are sequentially arranged from top to bottom at intervals of a preset distance, and the first filtering piece, the second filtering piece and the third filtering piece cover the air passing sections in the corresponding air inlet channel; one side edge of the three in the first direction is lower than the other side edge in the vertical direction; the first direction is horizontal and is close to or far away from the cabinet; the filtering density of the third filtering piece is smaller than that of the first filtering piece and the second filtering piece. According to the filtering structure, the air inlet resistance is reduced, and meanwhile the effective waterproof and dustproof functions can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of cabinet air intake structures, and particularly to a cabinet body air intake filtering structure and a cabinet. Background Art

[0002] Current electrical cabinets, such as energy storage cabinets, converter cabinets, inverter cabinets, etc., mainly consist of a cabinet body and electrical devices located inside the cabinet. These electrical devices usually generate relatively high heat and need to be cooled. Electrical cabinets generally use air-cooled heat dissipation, that is, a fan and an air duct are arranged inside the cabinet, and an air inlet and an air outlet are arranged on the cabinet body. The air with a lower temperature outside is sucked into the air duct inside the cabinet through the air inlet, and after the heat of the electrical devices is taken away by the cold air, the air with an increased temperature is sent out through the air outlet to complete the air-cooled heat dissipation cycle.

[0003] In an outdoor scenario, the cabinet is directly exposed to the outdoor environment, and the electrical devices inside the cabinet have certain requirements for waterproofing and dustproofing. Therefore, other structures need to be added to the air inlet to prevent dust and rain from entering the inside of the cabinet. The existing waterproof and dustproof structures generally adopt a scheme of using a louver and a dustproof net in combination. The louver plays a role in waterproofing, and the dustproof net plays a role in dustproofing. However, the setting of the louver increases the air intake resistance and is not conducive to improving the ventilation flow rate, resulting in a reduction in the heat dissipation efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background art, and provide a cabinet body air intake filtering structure and a cabinet. While reducing the air intake resistance, this filtering structure can play an effective role in waterproofing and dustproofing.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] Technical Solution 1: A cabinet body air intake filtering structure, the cabinet body is provided with an air inlet, and it includes: a protective cover, which is suitable for being fixedly connected to the cabinet body, and is provided with a first opening facing downward, and forms an air intake channel suitable for communicating the first opening and the air inlet; and a filtering assembly, which is fixedly arranged in the protective cover and located in the air intake channel, and includes a first filtering element, a second filtering element, and a third filtering element arranged at preset intervals from top to bottom in sequence: the first filtering element, the second filtering element, and the third filtering element cover the air passing cross-section in the corresponding air intake channel, and one side edge of the three in the first direction is lower than the other side edge in the up-down direction; the first direction is horizontal and is the direction close to or away from the cabinet; the filtering density of the third filtering element is sparser than that of the first filtering element and the second filtering element.

[0007] Technical solution 2 based on technical solution 1: the first filter element, the second filter element and the third filter element all have a flat filter interface, and the filter interface of each of the three extends obliquely from bottom to top along the first direction and from the side close to the cabinet toward the side away from the cabinet.

[0008] Technical solution three based on technical solution two: the inclination angles of the filter interfaces of the first filter element, the second filter element and the third filter element relative to the up and down directions are consistent.

[0009] Technical solution 4 based on any one of technical solutions 1 to 3: on any plane perpendicular to the first direction and passing through the filter assembly, the distance between the first filter element and the second filter element is greater than the distance between the second filter element and the third filter element.

[0010] Technical solution five based on technical solution four: the third filter element is filtered through a filter net, and the first filter element and the second filter element are filtered through filter cotton.

[0011] Technical solution six based on technical solution five: the filter mesh used in the third filter element is a metal mesh.

[0012] Technical Solution 7 based on Technical Solution 5: The filter assembly also includes a fixed bracket, which is fixedly connected to the protective cover and located in the air inlet channel, and is provided with a first slot and a second slot arranged along the up and down directions; the first slot and the second slot both extend obliquely from bottom to top along the first direction; the first filter element and the second filter element are respectively suitable for being inserted into and positioned in the first slot and the second slot.

[0013] Technical Solution 8 based on Technical Solution 7: the two inner side surfaces of the protective cover in the second direction are provided with connecting parts protruding along the second direction; the fixed bracket is provided with connecting arms extending downward on both sides of the second direction; the lower edge of the connecting arm is bent along the second direction toward the outer side of the protective cover to form a connecting flange; the connecting flange is fixedly connected to the lower side surface of the connecting part.

[0014] Technical solution nine based on technical solution eight: the third filter element includes a filter bracket and a filter net connected to the filter bracket; the filter bracket is fixed to the protective cover and is provided with a clearance gap corresponding to the connecting arm so that the connecting arm is exposed under the filter bracket.

[0015] In addition, the present invention also provides technical solution ten: a cabinet, including a cabinet body, on which an air inlet is provided, and which adopts the cabinet body air inlet filter structure as described in any one of technical solutions one to nine.

[0016] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following beneficial effects:

[0017] Technical solution one provides a cabinet air intake filtering structure. The protective cover in the air intake filtering structure can be fixedly connected to the cabinet and can cooperate with the cabinet or form an air intake channel by itself. One end of the air intake channel is a first opening, and the other end communicates with the air intake on the cabinet. The first opening faces downward, so as to prevent external rainwater from entering the air intake channel, and the distance from the first opening to the air intake on the cabinet is extended through the air intake channel, making it more difficult for external rainwater to enter the air intake position. Moreover, the air intake channel has a large air passing area, which can effectively reduce the wind resistance, thereby improving the air-cooled heat dissipation efficiency.

[0018] At the same time, a filtering component is fixedly arranged in the air intake channel. The filtering component can filter the air entering the cabinet to protect the internal electrical devices. Among them, the filtering component is provided with a first filter element, a second filter element and a third filter element arranged in sequence from top to bottom, so as to realize the step-by-step filtering of the air. And the filtering density of the third filter element located at the bottom is looser than that of the first and second filter elements. The third filter element can play a preliminary filtering role, intercept larger particulate matters, prevent the upper more delicate first and second filter elements from being blocked too quickly, extend the overall maintenance period, and can reduce the initial wind resistance.

[0019] Particularly, in the filtering component adopted in this technical solution, one side edge of the first, second and third filter elements in the first direction is lower than the other side edge in the up-down direction, that is, the filtering component has an inclined extension structure as a whole. This inclined structure is beneficial to using gravity to guide the possible entering water droplets or deposited dust to slide to the lower side. After that, these water droplets and dust will accumulate together and then fall under the action of gravity. At the same time, it is also convenient to clean the filtering component, realizing the waterproof and self-cleaning of the structure. And in the air intake channel of the same size, compared with the horizontally extended arrangement method, the inclined structure helps to increase the contact area between the filtering component and the air flow, thereby improving the filtering efficiency and increasing the dust capacity of the filtering component. In addition, the inclined structure can also play a guiding role in the air flow to a certain extent, making the air flow pass through the air intake channel more smoothly to reach the air intake, and reducing the air flow turbulence at the bottom of the protective cover.

[0020] Moreover, the first, second, and third filter elements in the filtering component are not simply stacked on top of each other in the vertical direction, but are spaced apart by a preset distance. When air flows through a layer of filter medium, its speed and direction may become uneven, especially after the filter medium starts to accumulate dust. The set spacing provides a buffer zone. In this buffer zone, the air flowing out of the upper filter element has the opportunity to adjust its speed and spread laterally, making the air flow more evenly distributed when it reaches the lower filter element. Therefore, this buffer zone helps to make more full use of the entire filtering area of the lower filter element, avoiding premature clogging or penetration due to excessive air flow in local areas while insufficient utilization in other areas, thereby improving the overall filtering efficiency and dust holding capacity. At the same time, this buffer zone provides a space for water droplets and dust, enabling some larger particulate matters that are barely intercepted by the third filter element or lose their kinetic energy after penetration to have space to fall or stay between this layer and the next layer, rather than immediately adhering tightly or clogging on the surface of the second filter element, thus extending the service life of the second and first filter elements.

[0021] More importantly, through the synergistic effect of the inclined structure of the filtering component and the spacing structure between the filter elements, a stepped drainage and dust discharge channel can be formed in this air inlet filtering structure, and the transition and distribution of the air flow can be optimized, thereby enhancing the filtering function of each stage. Specifically, after the water droplets pass through the lowermost third filter element, they enter the first spacing space. Some of the water droplets may settle here and then fall on the surface of the inclined second filter element. Since the second filter element is also inclined, the water will continue to flow along its surface towards the lower side. If there is still water passing through the second filter element and entering the second spacing space, it will similarly fall on the surface of the inclined first filter element and be guided. This progressive inclined + spacing structure provides multiple opportunities for water to be intercepted and guided out, greatly enhancing the overall waterproof reliability. The spacing distance ensures that the water discharged from the upper layer does not directly fall on the center of the lower layer, but has the opportunity to be effectively collected and guided by the inclined surface of the lower layer. Moreover, this "inclined - spaced - inclined" structure enables the air flow to pass through multiple layers of filtration in a smoother manner, avoiding drastic changes in the air flow direction or excessive turbulence between layers, helping to maintain a lower overall air resistance and ensuring the ventilation volume.

[0022] Therefore, the cabinet air inlet filtering structure provided by this technical solution can effectively perform waterproof and dustproof functions while reducing the air inlet resistance.

[0023] In the second technical solution, the first, second, and third filter elements all have flat filter interfaces through which the filtering function can be achieved. Moreover, the inclination directions of these filter elements are inclined upward along the first direction from the side close to the cabinet body towards the side away from the cabinet body. This inclination method can avoid the air inlet on the cabinet body, enabling the protective cover to effectively accommodate the inclined filter assembly without being set too long in the vertical direction. In addition, since the filter interface is flat, it can simplify the production and manufacturing of the filter elements and facilitate the installation and disassembly of the filter elements.

[0024] In the third technical solution, the first, second, and third filter elements have the same inclination angle. When these filter elements are fixed by the same manufacturing structure, the consistency and stability of the installation can be ensured. At the same time, the same inclination angle can make the path deflection of the air flow through each layer of filter element similar, which helps to form a more stable and predictable overall flow resistance characteristic.

[0025] In the fourth technical solution, it is defined that the distance between the first filter element and the second filter element is greater than the distance between the second filter element and the third filter element. This difference in the spacing distance is related to the filtering density of the first, second, and third filter elements themselves. Since the filtering density of the third filter element is relatively sparse and the air flow is easy to pass through the third filter element, the spacing distance between the third filter element and the second filter element can be set smaller, thereby reducing the volume space occupied by the filter assembly. The larger spacing distance between the first and second filter elements is adapted to their relatively dense filtering density, which can provide a larger buffer and redistribution space for the air flow after passing through the second filter element, enabling the air flow to contact the first filter element more evenly and improving the filtering efficiency and dust capacity of the first filter element.

[0026] In the fifth technical solution, the third filter element uses a filter mesh, and the first and second filter elements use filter cotton. The filter mesh is strong, durable, has low air resistance, and is easy to clean. The filter cotton has a high filtering accuracy, can achieve multi-level step-by-step filtering, and a more comprehensive filtering effect.

[0027] In the sixth technical solution, the filter mesh in the third filter element is a metal mesh. The metal mesh has a high thermal conductivity. In the case of a low temperature, it can cause water vapor to condense on the mesh. At the same time, the inclined third filter element can make the rainwater slide off quickly, thereby reducing the rainwater from entering the air inlet.

[0028] In the seventh technical solution, a fixing bracket is provided, and a first slot and a second slot are provided on the fixing bracket. The first and second filter elements can be installed on the fixing bracket by means of plug-in fixation and then fixed in the air inlet channel through the fixing bracket, so that the filter cotton can be conveniently inserted and removed, simplifying the replacement and cleaning work of the filter cotton and reducing the maintenance difficulty and time cost.

[0029] In Technical Solution 8, through the cooperation of the connecting part, the connecting arm and the connecting flange, a firm and reliable mechanical connection between the fixing bracket and the protective cover is achieved. And this connection method can facilitate the disassembly of the fixing bracket from the bottom up below the protective cover.

[0030] In Technical Solution 9, the third filter element is directly fixed to the protective cover through the filter bracket, and a relief notch is provided on the filter bracket. The connecting arm of the fixing bracket can extend out from the relief notch, so that the position where the connecting flange is tightly connected to the connecting part is exposed under the third filter element, facilitating the disassembly and assembly of the fixing bracket.

[0031] Technical Solution 10 provides a cabinet, which adopts the above-mentioned cabinet body air intake filtering structure, can better adapt to outdoor or dusty environments, protect internal sensitive electrical equipment, and improve the operation reliability and lifespan of the equipment. Brief Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is an exploded schematic view of the cabinet body air intake filtering structure involved in the embodiment of the present invention;

[0034] Figure 2 It is a three-dimensional schematic view of the cabinet body air intake filtering structure involved in the embodiment of the present invention Figure 1 ;

[0035] Figure 3 It is a three-dimensional schematic view of the cabinet body air intake filtering structure involved in the embodiment of the present invention Figure 2 ;

[0036] Figure 4 It is a rear view of the cabinet body air intake filtering structure involved in the embodiment of the present invention;

[0037] Figure 5 It is Figure 4 the schematic view of the A-A cross-section in

[0038] Figure 6 It is Figure 1 the schematic view of the structure of the fixing bracket in

[0039] Figure 7 It is the schematic view of the structure of the first filter element or the second filter element in the cabinet body air intake filtering structure involved in the embodiment of the present invention.

[0040] Main Reference Numeral Descriptions:

[0041] Protective cover 10; First opening 11; Second opening 12; Air inlet channel 13; Cover body 14; Substrate 15; Connecting bracket 16; Connecting part 17;

[0042] Filter assembly 20; First filter element 21; Second filter element 22; Third filter element 23; Filter bracket 231; Yielding notch 232; Filter net 24; Filter cotton 25; Fixed bracket 26; First slot 261; Second slot 262; Connecting arm 263;

[0043] Connecting flange 264; Insertion port 265; Square grid bracket 27. Specific implementation mode

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0045] In the claims, specification and above-mentioned accompanying drawings of the present invention, unless otherwise clearly defined, when using terms such as "first", "second" or "third", etc., they are all used to distinguish different objects and not for describing a specific order.

[0046] In the claims, specification and above-mentioned accompanying drawings of the present invention, unless otherwise clearly defined, for orientation terms, when using terms such as "center", "horizontal", "longitudinal", "level", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. to indicate the orientation or position relationship, it is based on the orientation and position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the present invention.

[0047] In the claims, specification and above-mentioned accompanying drawings of the present invention, unless otherwise clearly defined, when using terms such as "fixed connection" or "fixedly connected", it should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two, that is, including non-detachable fixed connection, detachable fixed connection, being integrated as one body, and being fixedly connected through other devices or elements.

[0048] In the claims, specification and above-mentioned accompanying drawings of the present invention, when using terms such as "including", "having" and their variants, the intention is "including but not limited to".

[0049] Embodiment 1

[0050] Embodiment 1 of the present invention relates to an air inlet filtering structure for a cabinet body, which is used to filter the air inlet of the air cooling system of the cabinet. The filtering structure is arranged on the cabinet body of the cabinet, and an air inlet is provided on the cabinet body. Generally speaking, the air inlet will be arranged on the side wall of the cabinet body. In some other cases, the air inlet may also be arranged on the top wall of the cabinet body. In this embodiment, the case where the air inlet is arranged on the side wall of the cabinet body is taken as an example for description.

[0051] The air inlet filtering structure for the cabinet body involved in this embodiment mainly includes a protective cover 10 and a filtering component 20.

[0052] Referring to Figures 1 to 3 , the protective cover 10 is adapted to be fixedly connected to the cabinet body, and is provided with a first opening 11 facing downward, and forms an air inlet passage 13 adapted to communicate the first opening 11 and the air inlet; the filtering component 20 is fixedly arranged in the protective cover 10 and is located in the air inlet passage 13, and includes a first filtering element 21, a second filtering element 22 and a third filtering element 23 which are arranged at preset intervals from top to bottom in sequence: the first filtering element 21, the second filtering element 22 and the third filtering element 23 cover the air passing cross sections in the corresponding air inlet passages 13, and one side edge of the three in the first direction is lower than the other side edge in the up and down direction; the first direction is horizontal and is the direction close to or away from the cabinet; the filtering density of the third filtering element 23 is sparser than that of the first filtering element 21 and the second filtering element 22.

[0053] Among them, in this embodiment, the position relationship of each component is described in the directions of front, back, left, right, up and down. The first direction in this specification and the claims is Figure 1 the front-back direction shown in Figure 1 the left-right direction shown in Figure 1 the up-down direction shown in

[0054] Referring to Figure 1, the protective cover 10 includes a cover body 14, a base plate 15, and a connecting bracket 16. Among them, the base plate 15 is a flat plate-like member, on which there is a second opening 12 penetrating in the front-rear direction. The base plate 15 can be detachably fixed to the side wall of the cabinet through bolts, and the second opening 12 on the base plate 15 is hermetically docked with the air inlet on the cabinet after the base plate 15 is installed in place. The hermetic docking between the second opening 12 and the air inlet is achieved through a sealing strip installed between the base plate 15 and the cabinet. The cover body 14 is fixedly connected to the rear surface of the base plate 15, and the two can be specifically fixedly connected through a flange provided on the cover body 14. The cover body 14 is generally a semi-enclosed cover-like member, with its front side and lower side open, and a flange is provided at the front side edge position. After the cover body 14 is fixedly connected to the base plate 15, the two cooperate to form an air inlet passage 13, and a first opening 11 is formed at the bottom position of the cover body 14. The first opening 11 is connected to the second opening 12 through the air inlet passage 13, and then connected to the air inlet of the cabinet.

[0055] Of course, in other embodiments, the protective cover 10 may not include the base plate 15, but directly fixedly connect the cover body 14 to the side wall of the cabinet, and form the above-mentioned air inlet passage 13 and the first opening 11 through cooperation with the side wall of the cabinet. At this time, the first opening 11 can be directly connected to the air inlet on the cabinet through the air inlet passage 13.

[0056] The connecting bracket 16 is fixedly installed inside the cover body 14 through bolts. Through this connecting bracket 16, the filter assembly 20 can be fixedly installed in the air inlet passage 13 and form a fixed connection relationship with the protective cover 10. The specific structure of the connecting bracket 16 will be described in detail in the following part about how the filter assembly 20 is installed on the protective cover 10.

[0057] Refer to Figure 1 , the filter assembly 20 includes a first filter element 21, a second filter element 22, a third filter element 23, and a fixing bracket 26. Figure 1 In Figure 4 the second filter element 22 is not shown, and reference can be made to Figure 5 the cross-sectional schematic diagrams of

[0058] Among them, the first filter element 21, the second filter element 22, and the third filter element 23 all have a flat filter interface, and the filter interfaces of the three extend obliquely from bottom to top and from the side close to the cabinet to the side far from the cabinet in the first direction. And, the inclination angles of the filter interfaces of the first filter element 21, the second filter element 22, and the third filter element 23 relative to the up-down direction are the same.

[0059] Specifically, refer to Figure 5, the first filter element 21, the second filter element 22, and the third filter element 23 are arranged obliquely from top to bottom in sequence. The inclination angles of the three are the same, and they all extend obliquely from bottom to top from front to back. The filter bodies in the first filter element 21, the second filter element 22, and the third filter element 23 form a flat filter interface. In this embodiment, the third filter element 23 is filtered through a filter mesh 24, and the first filter element 21 and the second filter element 22 are filtered through filter cotton 25. The filtering density of the filter mesh 24 is sparser than that of the filter cotton 25. Therefore, the filtering density of the third filter element 23 is sparser than that of the first filter element 21 and the second filter element 22. The filtering densities of the filter cotton 25 used in the first filter element 21 and the second filter element 22 may be the same or different. For example, the filtering density of the filter cotton 25 in the second filter element 22 may be set to be sparser than that of the filter cotton 25 in the first filter element 21, so as to form a stepped filtering structure with gradually denser filtering density from bottom to top.

[0060] In this embodiment, the inclination direction of these filter elements is from bottom to top along the first direction and from the side close to the cabinet body towards the side away from the cabinet body. This inclination method can avoid the air inlet on the cabinet body, so that the protective cover 10 does not need to be set too long in the up and down direction and can effectively accommodate the obliquely arranged filter assembly 20. In addition, the filter interface is flat, which can simplify the production and manufacturing of the filter element, and is convenient for the installation and disassembly of the filter element. Moreover, the first, second, and third filter elements 23 have the same inclination angle. When these filter elements are fixed by the same manufacturing structure, the consistency and stability of the installation can be ensured. At the same time, the same inclination angle can make the path deflection of the air flowing through each layer of the filter element similar, which helps to form a more stable and predictable overall flow resistance characteristic.

[0061] Of course, in other embodiments, the filter interfaces in the first filter element 21, the second filter element 22, and the third filter element 23 may not be flat structures, but curved arc plate structures. In this kind of structure, one side edge of the three in the first direction is still lower than the other side edge, but its filtering area is larger than that of the above-mentioned flat filter interface, and better filtering performance can be provided.

[0062] In addition, on any plane perpendicular to the first direction and passing through the filtering component 20, the distance between the first filter element 21 and the second filter element 22 is greater than the distance between the second filter element 22 and the third filter element 23. That is to say, the second filter element 22 is closer to the third filter element 23 than to the first filter element 21, and this "closer" is relative to the filtering interfaces of the three. This difference in the spacing distance is related to the filtering density of the first, second, and third filter elements 23 themselves. Since the filtering density of the third filter element 23 is relatively sparse, air flow easily passes through the third filter element 23. Therefore, the spacing distance between the third filter element 23 and the second filter element 22 can be set smaller, thereby reducing the volume space occupied by the filtering component 20. The larger spacing distance between the first and second filter elements 22 is adapted to their relatively dense filtering density, and can provide a larger buffer and redistribution space for the air flow after passing through the second filter element 22, so that the air flow can contact the first filter element 21 more evenly, improving the filtering efficiency and dust capacity of the first filter element 21.

[0063] Referring to Figure 1 , Figure 6 and Figure 7 , the fixing bracket 26 is fixedly connected to the protective cover 10 and is located in the air inlet passage 13, and is provided with a first slot 261 and a second slot 262 arranged in the up and down direction; both the first slot 261 and the second slot 262 extend obliquely upward from bottom to top along the first direction; the first filter element 21 and the second filter element 22 are respectively adapted to be inserted into and positioned in the first slot 261 and the second slot 262. In addition, referring to Figure 1 and Figure 3 , on the two inner side surfaces of the protective cover 10 in the second direction, there are connecting portions 17 protruding along the second direction; on both sides of the fixing bracket 26 in the second direction, there are connecting arms 263 extending downward; the lower edge of the connecting arm 263 is bent outward along the second direction towards the outside of the protective cover 10 to form a connecting flange 264; the connecting flange 264 is fixedly connected to the lower side surface of the connecting portion 17.

[0064] Specifically, first referring to Figure 7 , both the first filter element 21 and the second filter element 22 adopt a structure of a square grid bracket 27 cooperating with a filter cotton 25. Among them, the square grid bracket 27 is a metal frame member, which encloses an opening in the middle around it, and a number of limiting rib strips extending horizontally and vertically are arranged on its upper and lower side surfaces. The frame and the limiting rib strips of the square grid bracket 27 define a groove-shaped structure for accommodating the filter cotton 25 in the up and down direction. The filter cotton 25 can be installed in this groove-shaped structure, and the filter cotton 25 is fixed by the limitation of the frame and the rib strips. The limiting rib strips can prevent the flexible filter cotton 25 from deforming in the middle position.

[0065] Then referring toFigure 6 , Figure 6 shows the structure of the fixing bracket 26 in the filtering component 20. The fixing bracket 26 is also a metal frame member, and its four sides enclose to form an opening in the middle. However, the four side frames of the fixing bracket 26 have a certain width in the up and down directions. At this time, two slots arranged in the up and down directions can be formed on the fixing bracket 26, namely the first slot 261 located above and the second slot 262 located below. Both the first slot 261 and the second slot 262 can be formed by a supporting wall located below and a limiting wall located above. The supporting wall and the limiting wall both extend inward from the side frame of the fixing bracket 26, thereby forming a groove-like structure between the two. Then, two groove-like structures opposite to each other in the left and right directions can cooperate to form a complete slot. At the same time, an insertion port 265 is provided at the end position of the slot. The first filter element 21 and the second filter element 22 can be inserted into the first slot 261 or the second slot 262 respectively from the corresponding insertion port 265. And after the first filter element 21 and the second filter element 22 are inserted in place, the side frame of the grid bracket 27 will just be located within the range of the first slot 261 and the second slot 262. At this time, the position range where the filter cotton 25 is located corresponds to the position range of the opening on the fixing bracket 26. By installing the first and second filter elements 22 on the fixing bracket 26, the first and second filter elements 22 can be conveniently inserted and removed, simplifying the replacement and cleaning work of the filter cotton 25 and reducing the maintenance difficulty and time cost.

[0066] In addition, referring to Figure 6 , the left and right side frames of the fixing bracket 26 extend downward to form connecting arms 263 protruding below the second filter element 22, and a connecting flange 264 extends outward in the left and right directions along the lower edge of the connecting arms 263. At the same time, referring to Figure 1 and Figure 3 , as a component in the protective cover 10, the connecting bracket 16 is provided with a connecting portion 17 at a position corresponding to the connecting flange 264. The connecting portion 17 extends inward along the inner side wall surface of the air inlet passage 13 in the second direction. The connecting flange 264 can be attached to the lower side surface of the connecting portion 17, thereby fixing the fixing bracket 26 to the connecting bracket 16. Through the cooperation of the connecting portion 17, the connecting arms 263 and the connecting flange 264, a firm and reliable mechanical connection between the fixing bracket 26 and the protective cover 10 is achieved. And this connection method can facilitate the disassembly of the fixing bracket 26 from the lower part of the protective cover 10 from bottom to top.

[0067] In this embodiment, the filter screen 24 used in the third filter member 23 is a metal mesh. The third filter member 23 includes a filter bracket 231 and a filter screen 24 connected to the filter bracket 231; the filter bracket 231 is fixedly connected to the protective cover 10 and is provided with a relief notch 232 corresponding to the connecting arm 263, so that the connecting arm 263 is exposed below the filter bracket 231. Specifically, referring to Figure 1 , the filter bracket 231 is a square metal frame member, and the above-mentioned metal filter screen 24 is arranged on its inner side. Referring to Figure 5 , the third filter member 23 is located below the fixed bracket 26. At the same time, the filter bracket 231 of the third filter member 23 is fixedly connected to the connecting bracket 16. Relief notches 232 are arranged at positions corresponding to the connecting arm 263 on the left and right side frames of the filter bracket 231. When installing the filter assembly 20, first install the fixed bracket 26 inserted with the first filter member 21 and the second filter member 22 onto the connecting bracket 16, and then fixedly connect the third filter member 23 to the connecting bracket 16. At this time, the connecting arm 263 will be exposed from the relief notch 232 of the filter bracket 231.

[0068] The filter screen 24 in the third filter member 23 is a metal mesh. The metal mesh has a high thermal conductivity. In the case of relatively low temperature, water vapor can be condensed on the grid. At the same time, the inclined third filter member 23 can make rainwater slide off quickly, thereby reducing the rainwater entering the air inlet.

[0069] This embodiment relates to a cabinet air inlet filtering structure. The protective cover 10 in the air inlet filtering structure can be fixedly connected to the cabinet and can cooperate with the cabinet or form an air inlet channel 13 by itself. One end of the air inlet channel 13 is a first opening 11, and the other end communicates with the air inlet on the cabinet. The first opening 11 faces downward and is open, so as to prevent external rainwater from entering the air inlet channel 13, and the distance from the first opening 11 to the air inlet on the cabinet is extended through the air inlet channel 13, and it is more difficult for external rainwater to enter the air inlet position. Moreover, the air inlet channel 13 has a large air passing area, which can effectively reduce the wind resistance, thereby improving the air-cooled heat dissipation efficiency.

[0070] At the same time, a filter assembly 20 is fixedly arranged in the air inlet channel 13. The filter assembly 20 can filter the air entering the cabinet to protect the internal electrical devices. Among them, the filter assembly 20 is provided with a first filter member 21, a second filter member 22 and a third filter member 23 arranged in sequence from top to bottom, so as to realize the step-by-step filtration of the air. And the filtering density of the third filter member 23 at the bottom is looser than that of the first and second filter members 22. The third filter member 23 can play a preliminary filtering role to intercept larger particles, prevent the relatively fine first and second filter members 22 above from being blocked too quickly, extend the overall maintenance cycle, and can reduce the initial wind resistance.

[0071] Specifically, in the filtering component 20 adopted in this technical solution, one side edge of the first, second, and third filtering elements 23 in the first direction is lower than the other side edge in the up-and-down direction, that is, the filtering component 20 has an inclined extension structure as a whole. This inclined structure is beneficial to using gravity to guide the possible incoming water droplets or deposited dust to slide to the lower side. After that, these water droplets and dust will accumulate together and then fall under the action of gravity. At the same time, it is also convenient to clean the filtering component 20, realizing the waterproof and self-cleaning of the structure. And in the air inlet channel 13 of the same size, compared with the horizontally extended arrangement, the inclined structure helps to increase the contact area between the filtering component 20 and the air flow, thereby improving the filtering efficiency and increasing the dust capacity of the filtering component 20. In addition, the inclined structure can also guide the air flow to a certain extent, making the air flow pass through the air inlet channel 13 more smoothly to reach the air inlet, and reducing the turbulence of the air flow at the bottom of the protective cover 10.

[0072] Moreover, the first, second, and third filtering elements 23 in the filtering component 20 are not simply stacked together in the up-and-down direction, but are spaced apart by a preset distance. Among them, when the air flows through a layer of filtering medium, its speed and direction may become uneven, especially after the filtering medium starts to accumulate dust. The set spacing provides a buffer area. In this buffer area, the air flowing out of the upper layer of filtering element has the opportunity to adjust its speed and spread laterally, making the air flow more evenly distributed when it reaches the lower layer of filtering element. Therefore, this buffer area helps to make more full use of the entire filtering area of the lower layer of filtering element, avoiding premature blockage or penetration caused by excessive air flow in local areas, while the utilization rate of other areas is insufficient, thereby improving the overall filtering efficiency and dust capacity. At the same time, this buffer area provides a space for water droplets and dust, so that some larger particulate matters that are barely intercepted by the third filtering element 23 or lose their kinetic energy after penetration have space to fall or stay between this layer and the next layer, rather than immediately closely adhering to or blocking the surface of the second filtering element 22, thereby prolonging the service life of the second filtering element 22 and the first filtering element 21.

[0073] More importantly, through the synergistic effect of the inclined structure of the filtering component 20 and the spacing structure between the filtering elements, a stepped drainage and dust removal channel can be formed in the air inlet filtering structure, and the transition and distribution of the air flow can be optimized, thereby enhancing the filtering function of each stage. Specifically, after the water droplets pass through the lowermost third filtering element 23, they enter the first spacing space. Some of the water droplets may settle here and then fall on the surface of the inclined second filtering element 22. Since the second filtering element 22 is also inclined, the water will continue to flow along its surface towards the lower side. If there is still water passing through the second filtering element 22 and entering the second spacing space, it will also fall on the surface of the inclined first filtering element 21 and be guided. This progressive inclined + spacing structure provides multiple opportunities for the moisture to be intercepted and guided out, greatly enhancing the overall waterproof reliability. The spacing distance ensures that the water discharged from the upper layer does not directly fall on the center of the lower layer, but has the opportunity to be effectively collected and guided by the inclined surface of the lower layer. Moreover, this "inclined - spaced - inclined" structure enables the air flow to pass through multiple layers of filtration step by step in a smoother manner, avoiding a drastic change in the air flow direction or excessive turbulence between the layers, helping to maintain a lower overall air resistance and ensuring the ventilation volume.

[0074] Embodiment 2

[0075] Embodiment 2 of the present invention relates to a cabinet, which includes a cabinet body and an air inlet is provided on the cabinet body. This cabinet adopts the cabinet body air inlet filtering structure described in Embodiment 1 above, can better adapt to outdoor or dusty environments, protect internal sensitive electrical equipment, and improve the operation reliability and lifespan of the equipment.

[0076] The above description of the specification and embodiments is used to explain the protection scope of the present invention, but does not constitute a limitation on the protection scope of the present invention. Through the inspiration of the present invention or the above embodiments, those of ordinary skill in the art, combined with common general knowledge, ordinary technical knowledge in the field, and / or existing technologies, can obtain modifications, equivalent replacements, or other improvements to the embodiments of the present invention or some of its technical features through logical analysis, reasoning, or limited experiments, and these should all be included within the protection scope of the present invention.

Claims

1. A cabinet air inlet filter structure, wherein the cabinet is provided with an air inlet, characterized in that: include: A protective cover (10) adapted to be fixedly connected to the cabinet, and having a first opening (11) open downwardly and forming an air inlet passage (13) adapted to connect the first opening (11) and the air inlet; and A filter assembly (20) is fixedly mounted on the protective cover (10) and located in the air inlet passage (13), comprising a first filter element (21), a second filter element (22) and a third filter element (23) which are arranged in sequence from top to bottom at a preset distance: the first filter element (21), the second filter element (22) and the third filter element (23) cover the wind cross-section in the air inlet passage (13) corresponding to each other, and one side edge of the three in the first direction is lower than the other side edge in the up-down direction; the first direction is horizontal and is a direction approaching or moving away from the cabinet; the filtering density of the third filter element (23) is less than that of the first filter element (21) and the second filter element (22).

2. A cabinet air inlet filter structure as claimed in claim 1, characterized in that: The first filter element (21), the second filter element (22) and the third filter element (23) all have a flat filter interface, and each of the three filter interfaces extends obliquely from bottom to top along a first direction and from a side close to the cabinet toward a side away from the cabinet.

3. A cabinet air inlet filter structure as claimed in claim 2, characterized in that: The inclination angles of the filtering interfaces of the first filter element (21), the second filter element (22) and the third filter element (23) relative to the up and down directions are consistent.

4. A cabinet air inlet filter structure according to any one of claims 1 to 3, characterized in that: On any plane perpendicular to the first direction and passing through the filter assembly (20), the distance between the first filter element (21) and the second filter element (22) is greater than the distance between the second filter element (22) and the third filter element (23).

5. A cabinet air inlet filter structure as claimed in claim 4, characterized in that: The third filter element (23) is filtered through a filter net (24), and the first filter element (21) and the second filter element (22) are filtered through filter cotton (25).

6. A cabinet air inlet filter structure as claimed in claim 5, characterized in that: The filter mesh (24) used in the third filter element (23) is a metal mesh.

7. The cabinet air inlet filter structure according to claim 5, characterized in that: The filter assembly (20) further comprises a fixing bracket (26), the fixing bracket (26) being fixedly connected to the protective cover (10) and being located in the air inlet passage (13), and being provided with a first slot (261) and a second slot (262) arranged in an up-down direction; the first slot (261) and the second slot (262) both extend obliquely from bottom to top in a first direction; the first filter element (21) and the second filter element (22) are respectively suitable for being inserted into and positioned in the first slot (261) and the second slot (262).

8. A cabinet air inlet filter structure as claimed in claim 7, characterized in that: The protective cover (10) is provided with connecting portions (17) protruding along the second direction on two inner side surfaces in the second direction; the fixing bracket (26) is provided with connecting arms (263) extending downward on both sides in the second direction; the lower edge of the connecting arm (263) is bent along the second direction toward the outer side of the protective cover (10) to form a connecting flange (264); the connecting flange (264) is fixedly connected to the lower side surface of the connecting portion (17).

9. A cabinet air inlet filter structure as claimed in claim 8, characterized in that: The third filter element (23) comprises a filter support (231) and a filter screen (24) connected to the filter support (231); the filter support (231) is fixed to the protective cover (10) and is provided with a clearance notch (232) corresponding to the connecting arm (263) so that the connecting arm (263) is exposed below the filter support (231).

10. A cabinet, comprising a cabinet body, wherein the cabinet body is provided with an air inlet, wherein: It adopts the cabinet air inlet filtering structure as described in any one of claims 1 to 9.

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