A 60kw energy storage positive top discharge low pressure loss energy saving noise reduction air duct structure

Abstract

The utility model relates to energy storage system ventilation and heat dissipation technical field, specifically disclose a 60kw energy storage positive top exhaust low pressure loss energy -conserving noise reduction air duct structure, including rack, side wall shell and top shell, side wall shell is equipped with air intake area, and top shell is equipped with air outlet, and the air intake area in the rack is to the air outlet and is sequentially arranged with the flow area, heat exchange section, noise elimination area and eddy current resistance area, the flow area is equipped with louver in, and heat exchange section is equipped with radiating fin and radiating mouth, and noise elimination area is equipped with bottom sound -absorbing board, top sound -absorbing board and sound -absorbing material layer, and the eddy current resistance area is equipped with eddy current resistance guide plate. Air enters by side portion and is exhausted from top portion after flow guiding, heat exchange, noise elimination and rectification, reduces air current turning and local resistance, reduces operation noise simultaneously.

Description

Technical Field

[0001] This utility model relates to ventilation, heat dissipation and noise control technology for energy storage systems, and more specifically to a 60kW energy storage forward-inlet top-outlet low-pressure-loss energy-saving and noise-reducing duct structure. Background Technology

[0002] With the rapid deployment of large-scale energy storage systems, rack-mounted and containerized equipment, which house high-energy-density batteries and power conversion units within limited spaces, makes heat dissipation and noise control critical factors affecting system lifespan and site compliance. Existing ventilation paths often employ side-in / side-out or side-in / top-out configurations. Limited by cabinet space, wiring routes, and structural strength, airflow frequently undergoes multiple turns and abrupt changes in cross-section. The combined effects of inlet contraction, bend separation, localized rapid expansion, and grid interference result in high friction and localized losses. This forces fans to operate under higher static pressure, increasing energy consumption and deviating from the high-efficiency zone. To compensate for pressure losses, some solutions increase fan speed or airflow, but this significantly increases wind shear noise, vortex noise, and structural noise, particularly noticeable in near-person-managed or noise-sensitive environments.

[0003] In terms of airflow organization, traditional airflow guiding components often use fixed-angle guide plates or single-spacing louvers for basic air distribution. Due to uneven static pressure recovery along the channel height and component obstruction effects, the airflow at the upper and lower sections is prone to tilting, resulting in uneven velocity fields at the inlet of the heat exchange section. Local short-circuit air and bypass air leakage problems frequently occur. Temperature control manifests as amplified temperature differences between modules, with hot spots remaining at higher temperatures for extended periods, leading to accelerated capacity decay and deterioration of consistency. To improve airflow distribution, some approaches involve stacking denser airflow guiding components or lengthening the rectifier section, but this simultaneously introduces additional pressure drop and increased assembly complexity, making design trade-offs difficult.

[0004] In the heat exchange section, common through-fin or corrugated fin types, if poorly coupled with the mainstream direction, are prone to separation and reattachment near the leading and trailing edges. When the Reynolds number of the interfin channel is limited, convection enhancement is insufficient. If simply increasing the flow velocity to improve the Nusselt number is relied upon, the channel pressure drop and noise will be amplified simultaneously. Inadequate sealing of the fin sides can also introduce bypass airflow, leading to a decrease in effective through-fin airflow and making the phenomenon of "sufficient nominal airflow but insufficient local heat dissipation" more pronounced.

[0005] In terms of noise control, existing cabinets mostly use single-fiber sound absorption or straight-through silencing channels, which are adequate for the mid-to-high frequency range of fan blade frequencies and their harmonics, but have limited attenuation for the broader spectrum of noise caused by shear layer instability and backflow vortices. Simply thickening the sound-absorbing layer or lengthening the channel to improve noise reduction will significantly increase pressure drop and reduce equipment space. The common direct-mounted louvers or rain cap structures at the exhaust end are prone to inducing jet whistling and discrete peaks under high flow velocities. Furthermore, when the top exhaust is close to external pipelines or building components, the interaction between the jet and the backflow will cause vortexing and re-intake, which will increase noise and reduce effective ventilation efficiency.

[0006] In terms of maintenance and availability, the filter and silencer are located in key airflow areas, and dust accumulation and moisture can increase pressure drop and degrade acoustic performance. Without a modular quick-release structure, routine maintenance requires prolonged downtime to disassemble the outer casing and internal components, resulting in significant on-site work and risks such as lost fasteners and damaged seals. Inadequate sealing design or insufficient tightening force will reduce the airtightness of the airflow duct, exacerbating bypass air leakage and sound leakage, thus compromising filtration and noise reduction effects. Over-reliance on adhesive coatings may also lead to irreversible seal degradation after repeated opening and closing, reducing long-term reliability.

[0007] In terms of engineering adaptability, energy storage equipment must meet different airflow and allowable pressure drop targets while also taking into account noise limits and structural constraints. The traditional linear approach of "adding fans," "adding silencers," and "adding airflow guides" often results in mutual constraints: the tortuous channels designed for noise reduction increase the pressure drop, the enlarged cross-sections for pressure reduction reduce sound absorption efficiency, and the guide plates added for uniform distribution introduce howling and vortex street effects. Industry practice shows that single-dimensional optimization is difficult to achieve a stable balance between energy consumption, temperature control consistency, noise, and maintainability. A systematic coordination of ventilation organization, heat exchange coupling, silencer mechanisms, and exhaust rectification is required.

[0008] Based on the above situation, there is an urgent need for a complete air duct solution that reduces unnecessary turns and abrupt changes in the overall airflow path, achieves engineered matching of angles and spacing at the flow guides and heat exchange points, simultaneously covers key frequency bands and ensures low pressure loss in the silencing structure, and achieves effective rectification and suppresses backflow at the exhaust end. At the same time, this solution should feature modular quick-release, reliable locking, and continuous sealing to ensure maintenance of filter media and silencing components under continuous or short-term shutdown conditions, and maintain stable airtightness and acoustic performance during long-term operation, thereby achieving the comprehensive goals of lower energy consumption, higher heat dissipation consistency, better noise control, and stronger life-cycle availability. Utility Model Content

[0009] The purpose of this invention is to provide a 60kW energy storage forward-inlet top-outlet low-pressure-loss energy-saving and noise-reducing air duct structure. This structure, through a direct airflow design with front air intake and top exhaust, combined with multi-stage flow guiding, noise reduction and heat exchange components, significantly reduces airflow resistance and noise, while improving heat dissipation.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] A 60kW energy storage forward-inlet, top-outlet, low-pressure-loss, energy-saving, and noise-reducing air duct structure includes a cabinet, side wall shells, and a top shell. The side wall shells have an air inlet area equipped with a side wall filter. The top shell has an exhaust vent and is equipped with a top filter. Within the cabinet, a flow-guiding area and a sound-absorbing area are sequentially arranged between the air inlet and exhaust vents. Louvers are arranged within the flow-guiding area, and the sound-absorbing area consists of a bottom sound-absorbing plate, a top sound-absorbing plate, and a sandwiched sound-absorbing material layer, forming a resistive sound-absorbing channel. An anti-vortex zone is provided at the exhaust vent, and an anti-vortex guide plate is installed in this zone; a heat dissipation component is installed inside the cabinet along the airflow direction, and the heat dissipation component includes heat dissipation fins and heat dissipation vents connected to them; a detachable locking mechanism is provided between the top shell and the side shell, and the locking mechanism includes a locking handle, a locking buckle and a pin end; wherein air enters from the air inlet area, passes through the air guide area and the noise reduction area, and is discharged from the top shell through the exhaust vent, forming a straight airflow path of positive inlet and top exhaust, so as to reduce pressure loss and achieve noise reduction.

[0012] Preferably, the side wall filter and the top filter are removable in a drawer-like manner via a mounting bracket, and can be pulled out along the guide of the mounting bracket when replacing or cleaning.

[0013] Preferably, the louvers are tilted at an angle of 5° to 35° relative to the horizontal plane, and the distance between adjacent louvers is 20 to 80 mm, in order to guide the flow and suppress turbulence.

[0014] Preferably, the anti-vortex guide plate is arranged at an inclination angle of 10° to 45° upstream of the exhaust port, and forms a buffer cavity between it and the exhaust port to reduce backflow vortex and wind shear noise.

[0015] Preferably, the bottom and top sound-absorbing panels form a zigzag or serpentine channel, and the sound-absorbing material layer is a porous fiber material, a micro-perforated plate, or a composite structure thereof, to cover the target frequency band of 500Hz to 5kHz.

[0016] Preferably, the heat dissipation fins are arranged close to the battery module or power module, the heat dissipation port faces the main flow direction of the flow guide area, and the fin spacing is 1 to 5 mm, so as to control the pressure drop while ensuring heat exchange.

[0017] Preferably, the mounting bracket supports both the bottom and top sound-absorbing panels, and the mounting bracket and the cabinet are connected by a drawer or flip-up mechanism for easy maintenance and repair.

[0018] Preferably, the locking handle is an eccentric pressing type or a quarter-turn quick lock structure. During operation, the locking and unlocking of the pin end and the locking buckle can be quickly opened and closed with one hand, and an axial pressing force is applied to the outer shell interface.

[0019] Preferably, a sealing strip is provided at the connection between the side wall shell and the top shell. After the locking mechanism is closed, it presses the sealing strip to ensure the airtightness of the air duct and prevent airflow bypass.

[0020] Preferably, the outer side of the top shell is provided with a lifting pin that is rigidly connected to the cabinet support frame for hoisting and transporting the entire unit.

[0021] As can be seen from the above technical solution, compared with the prior art, this utility model adopts a straight-through airflow path with front air intake and top exhaust, combined with the gradually changing cross section and louvered directional design of the guide area, which significantly reduces the additional losses caused by sudden turns and local contraction, reduces the total pressure drop of the air duct, and puts the fan operating point into the high-efficiency zone, achieving energy saving of the whole machine. The guide mechanism makes the velocity field entering the heat exchange section more uniform, and the cold air forms a stable wall-adhering flow in the area near the heat dissipation fins, which not only improves the convective heat transfer capacity but also suppresses terminal separation and bypass airflow; thus, the temperature difference between the battery module and the power module converges, the temperature control is more stable, which helps to extend the life of key components and improve system reliability. The silencing channel adopts a composite solution of resistive structure and sound-absorbing material, which can cover the main frequency bands of wind shearing sound and vortex sound; the zigzag or serpentine channel layout extends the sound path and reduces direct transmission while ensuring the equivalent cross section ratio, taking into account the requirements of noise reduction and low pressure loss, and meeting the noise limit of near-personnel monitoring scenarios. The exhaust end incorporates anti-vortex guidance and buffer chamber rectification to suppress backflow vortices and jet whistling, resulting in smoother top exhaust, reduced discrete noise peaks, and improved matching stability with external piping or top fans. The filter, silencer, and top cover all adopt a modular, quick-release structure, combined with a rapid locking and sealing design, allowing maintenance and replacement to be completed without interruption or with short-term shutdowns, significantly reducing labor time and downtime losses. Continuous sealing and axial compression ensure airtightness, suppressing bypass air leakage and sound leakage, and improving dust and moisture protection levels. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a frontal perspective view of the air duct structure of this utility model in its installed state;

[0024] Figure 2 This is another perspective view of the air duct structure of this utility model in its installed state;

[0025] Figure 3 This is a schematic diagram of the locking assembly of this utility model;

[0026] Figure 4 This is a perspective view of the air duct structure of this utility model;

[0027] Figure 5 This is a schematic diagram of the internal structure of the overall air duct of this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Side wall housing, 101-Side wall filter, 2-Top housing, 201-Lifting pin, 202-Top filter, 203-Exhaust vent, 3-Air inlet area, 301-Bottom sound-absorbing plate, 302-Top sound-absorbing plate, 303-Louvre, 4-Anti-vortex area, 401-Anti-vortex guide plate, 5-Sound-absorbing area, 501-Sound-absorbing material layer, 6-Airflow guiding area, 601-Heat dissipation fins, 602-Heat dissipation vent, 7-Rack, 8-Mounting bracket, 9-Locking handle, 901-Locking buckle, 902-Pin end. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example

[0032] like Figures 1-5 As shown, this embodiment provides a forward-entry, top-discharge, low-pressure-loss, energy-saving, and noise-reducing air duct structure for a 60kW energy storage cabinet. The cabinet 7 has external dimensions of approximately 2200mm in height, 1000mm in width, and 1100mm in depth. The cabinet 7 adopts a square tube frame with sheet metal outer covering. Both the side wall shell 1 and the top shell 2 are galvanized steel sheet bent and welded components, preferably with a sheet thickness of 1.5mm. The outer surface is coated with epoxy polyester powder to improve corrosion resistance and outdoor weather resistance. Lifting pins 201 are arranged on the outer side of the top shell 2. The lifting pins 201 are welded to the load-bearing frame of the cabinet 7 via reinforcing plates to meet the requirements for lifting and transportation of the entire unit.

[0033] The air intake area 3 is located in the lower part of the side wall casing 1, with an opening area of ​​approximately 0.18–0.25 m². 2Three sidewall filters 101 are installed in the air intake area. Each sidewall filter 101 uses an aluminum alloy frame drawer-type structure, with ball bearing guides on both sides of the mounting bracket 8 for smooth pull-out. Each filter weighs no more than 2.5 kg, facilitating single-person installation and removal. The filter media is preferably a composite layer of metal wire mesh and synthetic fiber, with an equivalent filtration level of approximately G3 to G4, an initial resistance of approximately 40 to 60 Pa, and a recommended replacement pressure differential of approximately 120 to 150 Pa. To avoid additional losses caused by inlet constriction, a chamfer with a width of 15 to 25 mm is provided on the outer side of the sidewall filter 101.

[0034] The back of the sidewall filter 101 is the flow guiding area 6. Several louvers 303 are arranged within the flow guiding area 6. The louvers 303 are made of aluminum alloy profiles, with a thickness of 0.8 to 1.0 mm and a single louver height of 30 to 45 mm. To balance pressure drop and directional capability, the installation angle of the louvers 303 relative to the horizontal plane is selected at 15 degrees in this embodiment. The net distance between adjacent louvers 303 is 40 mm, the row and column spacing is uniform, and the overall opening ratio is approximately 65% ​​to 75%. The channel cross-section between the flow guiding area 6 and the subsequent heat exchange zone gradually changes according to the principle of isobaric gradient, with a transition section length of not less than 100 mm to suppress secondary vortices and separation.

[0035] A heat dissipation assembly is arranged behind the airflow guide area 6 to serve the cooling of the battery module and power module. The heat dissipation assembly includes heat sink fins 601 and heat dissipation vents 602. The heat sink fins 601 adopt an aluminum alloy through-plate structure with a fin thickness of 0.3mm, a fin spacing of 2.5mm, and a fin height of 200 to 300mm. The number of rows is determined according to the arrangement of the heat-generating units. The heat sink fins 601 are arranged adjacent to the heat-generating units, and sealing strips are added to both sides of the fins to reduce bypass airflow. The heat dissipation vents 602 are located at the end of the fin rows and face the main flow direction opening of the airflow guide area 6. The outlet width matches the channel width to prevent localized constriction. The typical airflow of the cabinet 7 is 3000 to 5000 m³ / h. 3 Based on the design benchmark, the hourly range, coupled with the fin spacing and 30° angle of the louvers, can achieve a high convective heat transfer coefficient in the wind speed range of 1.5 to 4.0 m / s, while keeping the additional pressure drop of the heat exchange section within an acceptable range for the project.

[0036] A noise reduction zone 5 is installed between the upstream of the heat exchange section and the exhaust end. The noise reduction zone 5 is a resistive channel formed by the bottom noise reduction plate 301 and the top noise reduction plate 302, with a total channel length of approximately 600 to 900 mm. It is arranged in a two- or three-fold zigzag pattern along the channel, with corner radii of not less than 10 mm to reduce additional resistance. A sound-absorbing material layer 501 is sandwiched between the bottom noise reduction plate 301 and the top noise reduction plate 302. The sound-absorbing material layer 501 is a composite structure of fiber material and micro-perforated plate. The fiber layer is 20 to 30 mm thick with a density of 30 to 60 kg per cubic meter; the micro-perforated plate is 0.6 to 0.8 mm thick with a pore diameter of approximately 0.6 mm and an opening rate of approximately 1.5%. It works in conjunction with the back cavity to cover the main frequency band of fan and aerodynamic noise from 500 Hz to 5 kHz. To avoid the silencing section becoming a bottleneck for pressure drop, the equivalent channel cross-sectional area of ​​the silencing region 5 is not less than 80% of that of the flow guiding region 6. The composite material is fixed to the silencing plate substrate by pop rivets, and sealing strips are applied at the plate seams to prevent bypass air leakage and sound leakage.

[0037] An exhaust port 203 is located inside the top outer casing 2. An anti-vortex region 4 is located upstream of the exhaust port 203, within which an anti-vortex guide plate 401 is installed. The anti-vortex guide plate 401 is made of galvanized steel sheet with a bending length of 250 to 350 mm. In this embodiment, the installation angle is 20 degrees, forming a buffer cavity with the leading edge of the exhaust port 203 with a thickness of approximately 40 mm. This buffer cavity is used to complete near-wall rectification before the jet exits the pipe, reducing backflow vortices and wind shear noise. A top filter 202 is added to the outside of the exhaust port 203 to block foreign objects and rainwater intrusion. The top filter 202 is a combination of stainless steel woven mesh and an aluminum frame, with a snap-fit ​​assembly for easy maintenance.

[0038] A continuous sealing strip is installed at the assembly interface between the top outer shell 2 and the side wall outer shell 1. The sealing strip is made of EPDM foamed rubber with a cross-sectional width of 12 to 15 mm. The locking mechanism consists of a locking handle 9, a locking buckle 901, and a pin end 902. The locking handle 9 adopts a quarter-turn quick-lock structure with an axial pressing stroke of 2 to 3 mm. One set is arranged every 600 to 800 mm along the interface. After closing, it applies a uniform pressing force to the sealing strip to ensure the airtightness of the air duct. In addition to supporting the side wall filter 101, the mounting bracket 8 also supports the bottom sound-absorbing plate 301 and the top sound-absorbing plate 302, realizing modular drawer-type maintenance. During maintenance, the operator rotates the locking handle 9 to release the engagement between the pin end 902 and the locking buckle 901, lifts the top outer shell 2 or pulls out the mounting bracket 8 to complete the inspection and replacement of the filter and sound-absorbing components.

[0039] Work process:

[0040] During equipment operation, outside air enters through the air intake area 3, passes through the side wall filter 101 to remove dust, and then enters the airflow guiding area 6. Louvers 303 direct and evenly distribute the airflow to each channel. The airflow passes through the heat dissipation fins 601 to exchange heat with the heating unit, and then enters the resistive channel of the silencing area 5, where sound energy is dissipated through the coupling effect of the sound-absorbing material layer 501 and the micro-perforated plate. After being rectified and buffered by the anti-vortex guide plate 401 in the anti-vortex area 4, the airflow is stably discharged from the top outer shell 2 through the exhaust port 203, forming a direct-flow air path from top to bottom. This path reduces abrupt turns and cross-sectional changes, lowers pressure drop along the path and locally, and simultaneously suppresses broadband wind noise and vortex noise through silencing and rectification.

[0041] Engineering parameters and compatibility specifications:

[0042] With an air volume of approximately 4500m³ 3 With an inlet air velocity of approximately 2.0 m / s at the design point, the Reynolds number within the guide zone 6 is in the fully turbulent region. The 303 louver angle and spacing ratio ensure that the velocity field uniformity at the heat exchange section inlet is better than ±15%. Under the above silencing configuration, aerodynamic noise in the 500Hz to 5kHz frequency band is significantly attenuated. At the same time, the additional pressure drop of the silencing section is controlled within an acceptable range through channel cross-section control and gradual change design. For scenarios requiring higher static pressure reserve, the tilt angle of the anti-eddy current guide plate 401 can be adjusted to 15 to 30 degrees, and the thickness of the buffer cavity can be adjusted to 30 to 60 mm to achieve a new balance between noise and pressure drop.

[0043] Manufacturing and assembly process:

[0044] After the side wall shell 1 and top shell 2 are cut and bent, they are welded to the frame of the cabinet 7 and stress-relieved; the mounting bracket 8 is riveted and fixed to the guide rail; the louvers 303 are positioned and riveted to the support according to the tooling fixture; the heat dissipation fins 601 and heat dissipation vents 602 are assembled according to the clamping frame and screwed to the heat exchange bracket; the bottom sound-absorbing plate 301 and the top sound-absorbing plate 302 are assembled after the sound-absorbing material layer 501 and the micro-perforated plate are installed; the anti-eddy current guide plate 401 is screwed to the reinforcing rib with the positioning hole; after all gaps are glued, routine tests of air tightness, air volume, pressure drop, and noise are performed. Finally, the locking handle 9, locking buckle 901 and pin end 902 are installed, and the clamping force and guide rail smoothness are checked.

[0045] Maintenance strategy:

[0046] Maintain the sidewall filter 101 according to the differential pressure or time strategy. It is recommended to replace it when the differential pressure threshold is 120 to 150 Pa or after three to six months of cumulative operation. Inspect the sound-absorbing components quarterly; replace or dry the sound-absorbing material layer 501 if it is damp or has significant dust accumulation. Add a small amount of grease to the locking mechanism every six months and check the compression rebound of the sealing strip. Clean the top filter 202 monthly in dusty environments.

[0047] With the above configuration and parameter settings, this embodiment achieves a straight-through air path with top-mounted exhaust, uniform air distribution and heat exchange, rectification and noise suppression at the exhaust end, and rapid maintenance of filters and silencers without increasing the overall size of the cabinet, while taking into account the goals of low pressure loss, energy saving and low noise.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A 60kW energy storage forward-inlet top-outlet low-pressure-loss energy-saving and noise-reducing air duct structure, comprising a cabinet (7), a side wall shell (1), and a top shell (2), wherein: An air inlet area (3) is provided in the lower part of the side wall shell (1), and a retractable side wall filter (101) is installed in the air inlet area (3); an exhaust vent (203) is provided at the rear of the top shell (2) and a top filter (202) is installed; a guide area (6), a heat exchange section and a noise reduction area (5) are formed sequentially from the air inlet area (3) to the exhaust vent (203) inside the cabinet (7); characterized in that: Multiple rows of louvers (303) are arranged along the airflow direction in the flow guide area (6). The louvers (303) have an inclination angle of 10° to 25° relative to the horizontal plane, and the distance between adjacent louvers (303) is 30 to 60 mm. The edges of the louvers (303) are rolled. The heat exchange section is provided with through-plate heat dissipation fins (601), the fin spacing is 2-3mm, and the end of the fin is provided with a heat dissipation port (602) opening towards the main flow direction. The heat dissipation port (602) has an 8° slow expansion section and the length of the slow expansion section is 100-150mm. The silencing area (5) is formed by the bottom silencing plate (301) and the top silencing plate (302) forming a three-fold zigzag resistive channel. The equivalent cross-sectional area of ​​the channel is not less than 80% of the flow guiding area (6). A sound-absorbing material layer (501) is sandwiched between the two silencing plates. The sound-absorbing material layer (501) is a composite of fiber material and micro-perforated plate. The micro-perforated plate has a pore size of 0.5 to 0.8 mm and an opening rate of 1.2% to 2.0%. The fiber layer has a thickness of 25 to 35 mm. An anti-vortex region (4) is provided upstream of the exhaust vent (203). An anti-vortex guide plate (401) is provided inside the anti-vortex region (4). The anti-vortex guide plate (401) has an inclination angle of 15° to 30° relative to the horizontal plane and forms a buffer cavity with a thickness of 30 to 60 mm with the front edge of the exhaust vent (203). The side wall filter (101), bottom sound-absorbing plate (301) and top sound-absorbing plate (302) are installed together on the mounting bracket (8), and the mounting bracket (8) is a drawer-type detachable unit relative to the cabinet (7); A continuous sealing strip is provided at the joint between the top shell (2) and the side shell (1). The top shell (2) is locked with the locking buckle (901) and the pin end (902) by a quarter-turn locking handle (9). The locking handle (9) applies axial pressure to the sealing strip in the closed position.

2. The air duct structure according to claim 1, characterized in that: The side wall filter (101) and the top filter (202) are respectively mounted on the guide rail seat of the mounting bracket (8). The end of the guide rail is equipped with mechanical limit and magnetic positioning parts to prevent excessive pulling and facilitate positioning and reset.

3. The air duct structure according to claim 1, characterized in that: The flow guide area (6) is divided into three sections along the height direction: upper, middle and lower. The louvers (303) of the three sections have inclination angles of 12°, 18° and 22° respectively, and the net distance between adjacent louvers (303) in each section is 45mm.

4. The air duct structure according to claim 1, characterized in that: The louver (303) is made of aluminum alloy profile with a plate thickness of 0.8 to 1.0 mm and a rolled edge radius of 1 to 3 mm. The two ends of the louver (303) are riveted to the side support of the flow guide area (6) through the profile support.

5. The air duct structure according to claim 1, characterized in that: The heat dissipation fins (601) are provided with sealing strips on both sides and fixed with the heat exchange bracket. The sealing strips form linear contact with the side wall of the channel to suppress bypass airflow. A flow guide is provided on the outside of the heat dissipation port (602), and the flow guide is arranged coaxially with the slow expansion section.

6. The air duct structure according to claim 1, characterized in that: The thickness of the micro-perforated plate in the anechoic area (5) is 0.6-0.8 mm, and the depth of the back cavity is 20-50 mm; the corner of the zigzag channel is provided with a rounded transition, and the radius of the rounded corner is not less than 10 mm.

7. The air duct structure according to claim 1, characterized in that: The anti-eddy current guide plate (401) in the anti-eddy current region (4) is arranged in a staggered double-piece arrangement. The inclination angles of the front and rear pieces are respectively in the range of 15°~22° and 22°~30°, and the distance between the two pieces is 30~40mm.

8. The air duct structure according to claim 1, characterized in that: The exhaust vent (203) is located at the rear center of the top outer shell (2). A stainless steel woven top filter (202) with rain-guiding folds is installed on the outside of the exhaust vent (203). The exhaust vent (203) is coaxial with the axis of the external pipeline.

9. The air duct structure according to claim 1, characterized in that: Locking handles (9) are evenly distributed along the seams of the outer shell, with a spacing of 600-800 mm; the sealing strip is an EPDM foamed rubber strip with a cross-sectional width of 12-15 mm.

10. The air duct structure according to claim 1, characterized in that: The cabinet (7) is rigidly connected to the load-bearing frame and the lifting pin (201). The lifting pin (201) is connected to the load-bearing frame through a reinforcing plate and is equipped with a pressure-bearing pad.

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