Dry-type transformer outdoor shell and multi-layer protection ventilating window assembly

Abstract

The invention relates to the technical field of power equipment protection, and discloses a dry-type transformer outdoor shell and a multi-layer protection ventilation window assembly, and the outdoor shell comprises a shell panel and a ventilation and heat dissipation assembly arranged on the shell panel; the ventilation and heat dissipation assembly comprises a ventilation air window, a waterproof blade device, a first-layer net structure and a second-layer net structure which are sequentially arranged in a stacked mode. And hexagonal strip-shaped ventilation holes are formed in the ventilation air windows. The first-layer net structure and the second-layer net structure are arranged at intervals, meshes of the metal nets of the first-layer net structure and the second-layer net structure are arranged in a staggered mode, and at least one layer of metal net is of a double-layer composite woven structure and is provided with hydrophobic net wires with non-circular sections. The ventilation air window, the waterproof blade device, the first-layer net structure and the second-layer net structure are combined, and the effects of large effective ventilation area, good waterproof and dustproof performance and convenient maintenance are achieved in a compact space at the same time.

Description

Technical Field

[0001] This invention relates to the field of power equipment protection technology, and more specifically, to an outdoor housing for a dry-type transformer and a multi-layer protective ventilation window assembly. Background Technology

[0002] Dry-type transformers are increasingly used in outdoor applications in urban power distribution networks, commercial complexes, and other locations due to their advantages such as maintenance-free operation and good fire resistance. However, the outdoor operating environment is harsh, and the transformer itself generates a lot of heat (the top temperature can reach over 150℃), which places extremely stringent requirements on the ventilation and heat dissipation structure of the casing: it must have sufficiently large and numerous openings to ensure sufficient airflow for heat dissipation; at the same time, it must be able to effectively resist the intrusion of rain, snow, and dust to prevent damage to the internal equipment.

[0003] Existing outdoor equipment ventilation solutions, such as ordinary louvers with a single-layer insect screen, offer adequate ventilation but lack sufficient protection, making them prone to water ingress during heavy rain. Some high-protection cabinets employ labyrinthine air ducts or waterproof breathable membranes, but these structures often suffer from high ventilation resistance, low heat dissipation efficiency, high cost, and inconvenient maintenance. Other solutions simply combine heat dissipation and protection, resulting in very thick and heavy ventilation windows that negatively impact the equipment's appearance and compactness. The core contradiction lies in the need for open ventilation versus airtight protection. Finding a way to cleverly reconcile this contradiction within limited space and at a reasonable cost has long been a technical challenge in the industry. For example, patent document CN217642226U provides a louver with a water-guiding frame and filter, which guides drainage through its structure, but the multiple internal components may increase wind resistance and the structure is relatively complex. Patent document CN120320194A focuses on a removable and maintainable dustproof cotton design, but the ventilation window itself offers limited protection. None of them achieved a balance between ultra-high ventilation and high-strength water splash protection within an extremely thin space.

[0004] Therefore, the present invention aims to provide a completely new solution, which is not just a ventilation window, but a highly integrated ventilation and heat dissipation module that can be seamlessly embedded into the housing of equipment such as dry-type transformers, achieving the dual goals of ventilation and waterproofing and dustproofing in an extremely compact space. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-layer protective ventilation window assembly with a compact structure, extremely high ventilation efficiency, excellent waterproof and dustproof performance, and easy modular installation and maintenance. This assembly can be widely used on the housing of outdoor electrical equipment such as dry-type transformers.

[0006] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention proposes an outdoor housing for a dry-type transformer, comprising a housing panel and a ventilation and heat dissipation assembly disposed on the housing panel; the ventilation and heat dissipation assembly comprises, from the outside to the inside, a ventilation window, a waterproof blade device, a first layer mesh structure, and a second layer mesh structure; the ventilation window has an array of ventilation holes; the waterproof blade device comprises a bracket and a plurality of waterproof blades fixed on the bracket at a preset angle; both the first layer mesh structure and the second layer mesh structure are frame structures with metal mesh; wherein, there is a first gap between the first layer mesh structure and the waterproof blade device, and a second gap between the first layer mesh structure and the second layer mesh structure, and the mesh openings of the metal mesh of the first layer mesh structure and the metal mesh of the second layer mesh structure are arranged alternately, and at least one layer of the metal mesh adopts a double-layer composite woven structure.

[0007] Furthermore, the ventilation hole is a hexagonal elongated hole, and the bottom of the ventilation window is also provided with the hexagonal elongated hole to serve as a drainage hole.

[0008] The hexagonal structure provides a larger through-hole area and better structural stability than circular or square holes using the same materials. The array of ventilation holes results in an effective ventilation area of ​​over 66.3% per unit area, maximizing airflow from the source and providing ample cool air for transformer heat dissipation.

[0009] Furthermore, the waterproof blade has an inclination angle of 45°, and the waterproof blade is an L-shaped bent aluminum plate that is fixed to the bracket by riveting.

[0010] A 45° tilt angle strikes the optimal balance between preventing direct splashing and ensuring ventilation, effectively guiding raindrops to slide off to the sides. The L-shaped bend increases blade stiffness. Compared to welding or snap-fitting, riveting provides a damped rigid connection, effectively suppressing the transmission of low-frequency electromagnetic vibrations generated during transformer operation to the blades, thereby significantly reducing additional noise caused by resonance.

[0011] Furthermore, the double-layer composite woven structure includes a first woven mesh and a second woven mesh; the first woven mesh is located on the outer side, and the second woven mesh is located on the inner side; the mesh count of the first woven mesh is larger than that of the second woven mesh.

[0012] Furthermore, the wires of the metal mesh have a non-circular cross-section; the surface of the wires is provided with a hydrophobic coating.

[0013] Furthermore, the cross-sectional shape of the mesh wire is polygonal or elliptical.

[0014] The wires of the metal mesh have a non-circular cross-section, such as polygonal (e.g., triangular, hexagonal) or elliptical cross-sections, and are coated with a hydrophobic material, such as fluorosilane. The sharp edges of the non-circular cross-section can cut through impacting water droplets like a knife edge, making them easier to break into small particles and difficult to form a continuous water film covering the mesh openings. The hydrophobic coating greatly reduces the surface adhesion of water, making it difficult for broken water droplets or condensation to remain on the mesh wires, causing them to quickly coalesce and roll off. The combination of these two factors ensures that the metal mesh retains most of its openings open and breathable during rain, with almost no impact on ventilation efficiency.

[0015] Furthermore, the inner wall surfaces of the frame structures of the first and second mesh layers are provided with flow-guiding grooves, which are connected to drainage holes located at the bottom of the frame structure.

[0016] The guide grooves, like channels, actively collect all the water that rolls off the metal mesh and flows down from the inner wall of the frame structure, and guide it to the bottom in an orderly manner.

[0017] Furthermore, a clearance section is left between the lowest wire of the metal mesh of the first layer structure and the bottom of its frame structure, and the height of the clearance section is greater than the mesh size of the metal mesh of the first layer structure.

[0018] The clearance section ensures that the drainage outlet area is unobstructed, preventing the mesh from becoming clogged due to water flow or vibration, and guaranteeing that the drainage channel is always unobstructed. This makes the entire system's waterproof capability durable and reliable, without diminishing over time.

[0019] Furthermore, the width of both the first gap and the second gap is 8-12mm, and the area between the first mesh structure and the second mesh structure forms a slow flow section. The cross-sectional area of ​​the slow flow section perpendicular to the airflow direction is larger than the area of ​​a single ventilation hole on the ventilation window.

[0020] The sudden increase in the cross-sectional area of ​​the flow channel reduces the fluid velocity. This slow-flow section significantly reduces the air velocity carrying residual water mist, providing time and space for the tiny water mist particles to settle under gravity, further reducing the penetration kinetic energy of the water mist and improving the interception efficiency of the second-layer mesh structure.

[0021] Furthermore, the wire diameter used in the metal mesh of the first layer structure is smaller than the wire diameter used in the metal mesh of the second layer structure.

[0022] Furthermore, both the first-layer mesh structure and the second-layer mesh structure are integrally bent and welded mesh frames with cross-shaped ribs.

[0023] Secondly, the present invention provides a multi-layer protective ventilation window assembly for electrical equipment housings, comprising: Ventilation windows, which have an array of ventilation holes; The intermediate protection module includes spaced-apart waterproof blade devices and a first-layer mesh structure. The waterproof blade devices include a support and multiple waterproof blades fixed to the support at a preset angle. The first-layer mesh structure is a frame structure with a metal mesh and is located on the side of the waterproof blade devices facing away from the ventilation window. The second mesh structure is used to connect to the electrical equipment housing. The second mesh structure is a frame structure with a metal mesh, located on the side of the first mesh structure opposite to the waterproof blade device. The first mesh structure and the second mesh structure are spaced apart, and the mesh openings of their metal meshes are arranged alternately. At least one layer of the metal mesh adopts a double-layer composite weaving structure. At least the wires of the metal mesh of the first mesh structure have a non-circular cross-section and a hydrophobic coating on the surface.

[0024] Thirdly, the present invention proposes a dry-type transformer, comprising a transformer body and an outdoor housing for accommodating the transformer body, wherein the outdoor housing is the aforementioned outdoor housing for a dry-type transformer.

[0025] The beneficial effects of this invention are as follows: the first and second gaps constitute an airflow buffer zone and a water droplet guiding channel. The velocity of the humidified air entering the gaps is temporarily reduced, creating conditions for the subsequent separation process; at the same time, water droplets impacting the mesh surface can gather and slide off within this space, without blocking the ventilation interface in front. The mesh openings of the first and second layer metal meshes are staggered (i.e., misaligned), preventing water mist from penetrating in a straight line and forcing it to follow a zigzag path, greatly increasing the chances of impact and capture; and at least one layer of the metal mesh adopts a double-layer composite woven structure. The outer first woven mesh is responsible for the initial collision and breaking of larger water droplets; the relatively loose inner second woven mesh provides structural support and intercepts the fine water mist that penetrates the first woven mesh a second time. This gradient filtration design, with finer mesh at the front and coarser mesh at the back, ensures extremely high interception efficiency while significantly reducing ventilation resistance compared to simply using a high-mesh single-layer mesh, achieving an optimized balance between protection and ventilation. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the main structure of the dry-type transformer of the present invention; Figure 2 for Figure 1 A three-dimensional structural diagram of a dry-type transformer; Figure 3 for Figure 2 A schematic diagram of the three-dimensional structure of a dry-type transformer after the top is hidden. Figure 4 This is a schematic diagram of the main structure of the outdoor housing of the dry-type transformer of the present invention; Figure 5 for Figure 4 A schematic diagram of the side view structure; Figure 6 This is an exploded three-dimensional structural diagram of the outdoor casing of the dry-type transformer of the present invention; Figure 7 This is a schematic diagram of the main structure of the ventilation window of the present invention; Figure 8 This is a three-dimensional structural diagram of the waterproof blade device of the present invention; Figure 9 for Figure 8 A schematic diagram of the side view structure; Figure 10 This is a schematic diagram of the main structure of the first layer mesh of the present invention; Figure 11 for Figure 10 A schematic diagram of the structure viewed from below; Figure 12 This is a schematic diagram of the main structure of the second layer mesh of the present invention; Figure 13 for Figure 12 A schematic diagram of the AA cross-sectional structure.

[0028] Reference numerals: 100-Outdoor casing of dry-type transformer; 200-Multi-layer protective ventilation window assembly; 300-Dry-type transformer; 1-Ventilation window; 2-Waterproof blade device; 3-First layer mesh structure; 4-Second layer mesh structure; 5-Casing panel; 6-Hexagonal elongated hole; 7-Bracket; 8-Waterproof blade; 9-Mounting hole; 10-Metal mesh; 11-Drainage hole; 12-Frame structure; 13-First gap; 14-Second gap; 15-Guiding groove. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] It should be noted that the directional terms such as "upper," "middle," "lower," "inner," and "outer" used below are defined based on the accompanying drawings in the instruction manual.

[0032] like Figures 1-3 As shown, the present invention provides an outdoor housing 100 for a dry-type transformer, which includes a housing panel 5 and a ventilation and heat dissipation assembly disposed on the housing panel 5.

[0033] The present invention also provides a dry-type transformer 300, which includes a transformer body and an outdoor housing for housing the transformer body, namely the outdoor housing 100 of the dry-type transformer provided by the present invention.

[0034] In addition, the present invention also provides a multi-layer protective ventilation window assembly 200 for electrical equipment housing. The multi-layer protective ventilation window assembly 200 is essentially the ventilation and heat dissipation assembly of the invention, which is integrated on the housing panel 5 to provide an efficient heat dissipation channel for the dry-type transformer 300 housed inside the housing, while also having excellent outdoor protection capabilities.

[0035] Specifically, please refer to the following: Figure 6 The exploded view shows that the ventilation and heat dissipation assembly (or multi-layer protective ventilation window assembly 200) includes, from the outside (environment side) to the inside (equipment side): ventilation window 1, waterproof blade device 2, first layer mesh structure 3, and second layer mesh structure 4. They are stacked, and there are specific functional gaps between the layers.

[0036] Combination Figure 7 The ventilation window 1 is the outermost component, typically formed by stamping and bending a metal sheet. Its front and bottom areas are densely covered with an array of hexagonal elongated holes 6. These hexagonal elongated holes 6 are not randomly arranged, but rather a specially designed layout optimized by fluid mechanics and structural mechanics. This layout achieves an extremely high effective ventilation area ratio, for example, exceeding 66.3%, while ensuring the overall structural strength of the ventilation window 1. This means that the vast majority of the panel area can be used for ventilation, maximizing airflow from a physical perspective and laying a solid foundation for heat dissipation. Simultaneously, the hexagonal elongated holes 6 at the bottom also serve a drainage function.

[0037] Combination Figure 8 and Figure 9 The waterproof blade device 2 is located inside the ventilation window 1. It includes two supports 7 made of metal profiles and multiple waterproof blades 8 disposed between the two supports 7. Each waterproof blade 8 is preferably an L-shaped bent aluminum plate with its installation angle precisely set at 45°. The L-shaped bent aluminum plate includes a wide plate and a short plate, with the wide plate located on the outer side and the short plate located on the inner side, and the edges where the wide plate and the short plate intersect are horizontal. Taking two vertically adjacent supports 7 as an example, in the two vertically adjacent supports 7, the lower edge of the wide plate of the upper support 7 is at the same horizontal plane as the edge of the lower support 7. The structure and installation angle of the waterproof blades 8 are optimized values ​​obtained through a large number of splash-proof tests and wind tunnel tests, which can effectively guide rainwater to slide down the blade slope while minimizing obstruction to airflow. Test Method: The casing panel 5 was erected in an open area. A piece of cardboard was attached to its outer side, and a ventilation and heat dissipation component was then installed on the outer side of the cardboard. A NEMA 250 spray nozzle was used to spray the component, with a pressure of at least 35.4 kPa. The straight-line distance between the spray nozzle and the ventilation and heat dissipation component was 1400 mm, and the spray nozzle was positioned diagonally above the component. Simulated rainwater was continuously sprayed onto the ventilation and heat dissipation component for 1 hour. After 1 hour of testing, the cardboard remained dry and showed no watermarks.

[0038] The waterproof blade 8 is fixed to the pre-drilled holes in the bracket 7 by riveting. Compared with welding, riveting provides a reliable rigid connection, while the slight damping characteristics of its contact surface help absorb and attenuate the low-frequency vibration energy generated during transformer operation, thereby effectively suppressing blade resonance and reducing operating noise.

[0039] Combination Figure 10 and Figure 11 The first layer of mesh structure 3 is the first line of precision defense in the core protection. It includes a frame structure 12 and a metal mesh 10 fixed inside it. The frame structure 12 is preferably an integral bent and welded mesh frame with cross ribs, which is structurally rigid and not easily deformed. Longitudinal guide grooves 15 are machined on its inner wall surface, and drainage holes 11 are opened at the bottom of the frame.

[0040] The metal mesh 10 is one of the key innovations of this design. It employs a double-layer composite woven structure: the outer (windward-facing) layer is a dense woven mesh with a larger mesh count (e.g., 14 mesh) to initially impact and break up larger water droplets that penetrate the waterproof blades 8; the inner layer is a composite woven support mesh with a relatively smaller mesh count (e.g., 10 mesh), providing skeletal support for the overall structure and intercepting fine water mist that penetrates the outer mesh. Furthermore, the cross-section of the metal mesh 10 is non-circular, such as triangular, hexagonal, or elliptical, allowing its edges to more effectively cut water droplets. The mesh surface is also coated with a hydrophobic coating (such as fluorosilane materials), making it difficult for water droplets to adhere.

[0041] Another key detail is that a clearance section is intentionally left between the bottom wire of the metal mesh 10 and the bottom edge of the frame structure 12. The height (H) of this clearance section is designed to be greater than the size of a single mesh opening of the metal mesh 10, ensuring an unobstructed water collection and drainage channel above the drainage hole 11.

[0042] Please combine Figure 12 and Figure 13 The second mesh structure 4 is the last line of defense and serves as the base for connection to the shell panel 5. It also includes a frame structure 12 with cross-ribs and a fixed metal mesh 10. The metal mesh 10 can be a single layer of weave, but preferably its wire diameter is slightly larger than that of the inner supporting mesh of the first mesh structure 3 to enhance overall rigidity. During installation, the metal mesh 10 of the second mesh structure 4 and the metal mesh 10 of the first mesh structure 3 must be installed in a staggered arrangement, meaning the mesh centers are not aligned, forming an optical labyrinthine barrier.

[0043] During assembly, the second mesh structure 4 is first fixed to the housing panel 5 of the outdoor housing 100 of the dry-type transformer with screws. Then, the first mesh structure 3 is installed in front of the second mesh structure 4, with a second gap 14 maintained between them by mounting posts or gaskets, preferably 8-12 mm (e.g., 10 mm) wide. This area forms a slow-flow section where the air velocity decreases due to the sudden increase in the flow cross-sectional area. Next, the waterproof blade device 2 is installed in front of the first mesh structure 3, with the end of its waterproof blade 8 forming a first gap 13 between it and the metal mesh 10 of the first mesh structure 3, also preferably 10 mm wide. Finally, the ventilation window 1 is placed on the outermost side and fixed to the side connectors (such as rivets) of the second mesh structure 4 through the mounting holes 9 around it, thereby pressing and fixing all internal components.

[0044] When the dry-type transformer 300 is running, the internal hot air rises and is expelled, while the external cold air is drawn in. The external air first passes unimpeded through the hexagonal elongated holes 6 on the ventilation window 1 with an ultra-high opening ratio, achieving high-volume, low-resistance air intake. The airflow carries any raindrops that may be present, impacting the 45° inclined waterproof blades 8. Most raindrops are guided to the sides and slide out. The air then flows smoothly through the gaps between the blades. Air mixed with a small amount of water mist enters the first gap 13 and impacts the first layer of mesh structure 3. The outer fine mesh of its double-layer composite woven mesh further cuts and breaks up the water droplets; the hydrophobic and angular non-circular mesh fibers make it difficult for water droplets to adhere, causing them to quickly gather and roll off. The rolling water droplets and the water flowing down the gap walls are collected by the guide grooves 15 on the frame and finally discharged from the drain hole 11 and the hexagonal elongated holes 6 at the bottom of the ventilation window 1. The extremely fine water mist that penetrates the first layer of mesh enters the second gap 14 (slow flow section). Due to the reduced flow velocity, some of the water mist settles under gravity. The remaining water mist impacts the second layer of mesh structure 4. Due to the interlacing of the mesh openings, the water mist is forced to impact the mesh wires again and is further captured. Dry, clean air eventually enters the transformer casing.

[0045] Based on the same concept, the present invention also proposes a multi-layer protective ventilation window assembly, which includes a ventilation window, an intermediate protective module and a second layer mesh structure. Its structure is basically the same as that of the ventilation and heat dissipation assembly. The difference is that the intermediate protective module is actually a pre-combination of a waterproof blade device and a first layer mesh structure.

[0046] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0047] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0048] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An outdoor casing for a dry-type transformer, characterized in that, It includes a housing panel and a ventilation and heat dissipation assembly disposed on the housing panel; the ventilation and heat dissipation assembly includes a ventilation window, a waterproof blade device, a first mesh structure and a second mesh structure arranged sequentially from the outside to the inside; The ventilation window has an array of ventilation holes. The waterproof blade device includes a bracket and a plurality of waterproof blades fixed on the bracket at a preset angle. Both the first layer mesh structure and the second layer mesh structure are frame structures with metal mesh; wherein, there is a first gap between the first layer mesh structure and the waterproof blade device, and there is a second gap between the first layer mesh structure and the second layer mesh structure, and the mesh openings of the metal mesh of the first layer mesh structure and the metal mesh of the second layer mesh structure are arranged alternately, and at least one layer of the metal mesh adopts a double-layer composite weaving structure.

2. The outdoor casing of a dry-type transformer according to claim 1, characterized in that, The ventilation hole is a hexagonal elongated hole, and the bottom of the ventilation window is also provided with the same hexagonal elongated hole to serve as a drainage hole.

3. The outdoor casing of a dry-type transformer according to claim 1, characterized in that, The waterproof blade has an inclination angle of 45° and is an L-shaped bent aluminum plate that is fixed to the bracket by riveting.

4. An outdoor casing for a dry-type transformer according to any one of claims 1-3, characterized in that, The double-layer composite woven structure includes a first woven mesh and a second woven mesh; the first woven mesh is located on the outer side, and the second woven mesh is located on the inner side; the mesh count of the first woven mesh is larger than that of the second woven mesh.

5. The outdoor housing of a dry-type transformer according to claim 4, characterized in that, The wires of the metal mesh have a non-circular cross-section; the surface of the wires is coated with a hydrophobic coating.

6. The outdoor housing of a dry-type transformer according to claim 5, characterized in that, The inner wall surface of the frame structure of the first layer mesh structure and the second layer mesh structure is provided with a flow guiding groove, which is connected to the drainage hole provided at the bottom of the frame structure.

7. The outdoor housing of a dry-type transformer according to claim 6, characterized in that, There is a clearance section between the bottom wire of the first layer of the metal mesh and the bottom of its frame structure. The height of the clearance section is greater than the mesh size of the first layer of the metal mesh.

8. The outdoor housing of a dry-type transformer according to claim 7, characterized in that, The width of both the first gap and the second gap is 8-12mm, and the area between the first layer mesh structure and the second layer mesh structure forms a slow flow section. The cross-sectional area of ​​the slow flow section perpendicular to the airflow direction is larger than the area of ​​a single ventilation hole on the ventilation window.

9. A multi-layer protective ventilation window assembly for an electrical equipment housing, characterized in that, include: Ventilation windows, which have an array of ventilation holes; The intermediate protection module includes a waterproof blade device arranged at intervals and a first layer of mesh structure. The waterproof blade device includes a bracket and multiple waterproof blades fixed on the bracket at a preset angle. The first layer of mesh structure is a frame structure with metal mesh and is located on the side of the waterproof blade device that is away from the ventilation window. as well as The second mesh structure is used to connect to the electrical equipment housing. The second mesh structure is a frame structure with a metal mesh, located on the side of the first mesh structure opposite to the waterproof blade device. The first mesh structure and the second mesh structure are spaced apart, and the mesh openings of their metal meshes are arranged alternately. At least one layer of the metal mesh adopts a double-layer composite weaving structure. At least the wires of the metal mesh of the first mesh structure have a non-circular cross-section and a hydrophobic coating on the surface.

10. A dry-type transformer, characterized in that, The transformer includes a transformer body and an outdoor housing that houses the transformer body, wherein the outdoor housing is a dry-type transformer outdoor housing as described in any one of claims 1 to 8.

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