Ventilation protection shutter with negative pressure labyrinth structure blades

Abstract

The invention provides a ventilation protection shutter with blades of a negative pressure labyrinth structure. The ventilation protection shutter comprises the blades and a frame. The frames are sequentially connected to form a rectangular frame; the blades are fixed in the frames; each blade comprises a body, a first water retaining part and a second water retaining part, the cross section of the body is a V-shaped baffle, the body comprises a first side edge and a second side edge, the first water retaining part and the second water retaining part are fixed on the first side edge, the second water retaining part is arranged at the vertex angle of the body, and the first water retaining part is arranged below the second water retaining part; and two groups of blades with the same structure are arranged in the frame in a staggered manner. The shutter is a multilayer roundabout ventilation protection shutter with low wind resistance, the airflow path is prolonged, the protection performance is good at high wind speed, the blade interface shape and turning angle are optimized, the wind resistance is minimized, ventilation and heat dissipation are facilitated, a negative pressure barrier is generated, and rainwater / dust is prevented from entering a filter and equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of rain and dust protection for charging piles and energy storage cabinets, and in particular to a ventilation protection shutter with blades having a negative pressure labyrinth structure. Background Art

[0002] With the widespread use of power equipment in outdoor environments, ensuring proper heat dissipation while effectively protecting against the intrusion of external contaminants has become a key issue in electrical equipment design. Ventilation protection shutters effectively block dust, rain, and other external contaminants from entering energy storage cabinets and charging stations, protecting internal electrical components from corrosion. They also ensure air circulation within the cabinet, dissipating heat from the equipment, preventing performance degradation or failure due to overheating, and ensuring the stable operation of energy storage systems, especially in high-humidity and dusty environments such as outdoor or coastal areas.

[0003] In the design of charging piles and energy storage cabinets, protection levels (such as IP54) require the equipment to be dust- and rain-proof while also possessing efficient heat dissipation. However, existing structures present the following technical issues: First, traditional structures face a conflict between protection and heat dissipation: good protection performance comes with increased wind resistance, resulting in reduced heat dissipation efficiency. This incompatibility between wind resistance and protection is difficult to resolve, and traditional louver designs fail to effectively address this conflict, especially under high wind speeds. Second, existing solutions lack the integration of louver structural design with simulation calculations, making it impossible to accurately analyze airflow paths and overall resistance, making it difficult to maintain high protection performance under low wind resistance conditions. Third, existing technologies fail to fully consider the impact of blade cross-sectional shape and turning angle on wind resistance, nor do they utilize the principles of airflow dynamics to create a negative pressure barrier at the front of the filter to enhance protection. Summary of the Invention

[0004] The purpose of the present invention is to address the shortcomings of the existing technology, and to propose a ventilation protection shutter that accurately analyzes the airflow path and overall resistance through CFD simulation. The maze structure can extend the airflow path and increase the inertial sedimentation probability of rainwater / dust. At the same time, the wind resistance is minimized by optimizing the cross-sectional shape and turning angle of the blades, and a local low pressure is formed in the front end area of ​​the filter, generating a negative pressure barrier to automatically block part of the rainwater / dust.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A ventilation and protection shutter with blades in a negative pressure labyrinth structure, comprising blades and a frame; The frames are connected in sequence to form a rectangular frame, and the blades are fixed in the frames; The blade includes a body, a first water retaining portion and a second water retaining portion, the cross section of the body is a V-shaped baffle, the body includes a first side and a second side, the first water retaining portion and the second water retaining portion are fixed on the first side, the second water retaining portion is arranged at the top corner of the body, and the first water retaining portion is arranged below the second water retaining portion; Two groups of blades with the same structure are designed in the frame and arranged in a staggered manner. Each group of blades is arranged along the height direction of the rectangular frame, and the first water retaining part and the second water retaining part are arranged towards the wind inlet surface.

[0006] Furthermore, the cross-section of the first water retaining portion is arc-shaped, one side of the first water retaining portion is connected to the first side edge, the opening of the first water retaining portion is facing downward, the cross-section of the second water retaining portion is L-shaped, and the second water retaining portion includes a first plate and a second plate, the first plate is formed by the second side edge continuing to extend outward toward the top angle, the upper end of the second plate is connected to the end of the first plate away from the second side edge, and the second plate is parallel to the first side edge.

[0007] Furthermore, the inclination angle of the first side is 40-45°, the top angle of the main body is rounded, and the angle of the top angle exceeds 90°.

[0008] Furthermore, CFD simulation verified the blade arrangement spacing of the blinds. In each group of blades, the upper and lower spacing between two adjacent blades is the same, 8-10mm, and the left and right spacing between the two groups of blades is 5-6mm. Under the condition of CFD simulation of a wind speed of 2m / s, more than 95% of rainwater and dust particles with a diameter greater than 10μm are blocked, and the resistance is 83Pa.

[0009] Furthermore, the frame is made of aluminum alloy, the blades are made of aluminum alloy and connected in an integrated manner, and the surfaces of the frame and the blades are respectively treated with silver-white oxidation.

[0010] Furthermore, the cross section of the frame is L-shaped, and the connection between two adjacent frames is connected and fixed by a fixed corner piece. The fixed corner piece is L-shaped as a whole, and the two sides of the fixed corner piece are respectively connected to the two frames.

[0011] Furthermore, it also includes a quick-release plastic block, which is fixed on the inner side of the frame on both sides of the rectangular frame. The quick-release plastic blocks are equidistantly arranged along the height direction of the rectangular frame. The quick-release plastic block has a card slot, and the two ends of the blade are respectively fixed in the card slot for installation.

[0012] Furthermore, it also includes a filter, the size of which matches the size of the rectangular frame, the filter including a first frame and a filter element, the filter element being fixed in the first frame, the filter element being made of polyurethane or chemical fiber material, and the filter being installed on the rear side of the blade, close to the wind outlet surface.

[0013] Furthermore, it also includes a fixing part, which includes a cantilever beam and a hook-shaped protrusion, through holes are provided near both ends of the cantilever beam, one end of the hook-shaped protrusion is hinged to the cantilever of the cantilever beam, and one side of the hook-shaped protrusion has a hook plate bent outward; the frame includes a first flange and a second flange, the first flange is provided with a mounting hole, and the inner side of the second flange is also provided with a baffle, the baffle is arranged close to the air outlet surface, the cantilever beam is fixed on the end face of the second flange away from the first flange through the through hole, the fixing parts are symmetrically arranged on both sides of the rectangular frame, and the hook-shaped protrusion is rotated 90° to press the filter into the frame.

[0014] Furthermore, the quick-release plastic block is made of ABS material and is produced using an integrated mold.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses CFD simulation to accurately analyze the airflow path and overall resistance, achieving a multi-layer, circuitous, and low-resistance ventilation and protection effect, solving the problem of the existing technology that lacks the integration of louver structure design with simulation calculations; 2. The present invention uses a labyrinth structure to extend the airflow path, increasing the probability of inertial settling of rainwater / dust, solving the problem of poor protection performance at high wind speeds and effectively blocking rainwater / dust. At the same time, the cross-sectional shape and turning angle of the blades are optimized to minimize wind resistance, facilitate ventilation and heat dissipation, and solve the problem of the prior art that the cross-sectional shape and turning angle of the blades cannot be optimized to minimize wind resistance. 3. The present invention uses two sets of staggered blades to create a local low pressure in the front area of ​​the filter, generating a negative pressure barrier that automatically blocks some rainwater and dust from entering the filter and equipment, improving protection efficiency. CFD simulation shows that the negative pressure value formed in this area is approximately -5Pa, which can effectively block water droplets and dust particles with a diameter of less than 50μm. 4. The Z-shaped continuous turning design of the louver of the present invention makes it possible for almost no rainwater or dust to pass through the blades, thus greatly improving the protection performance; the surface of the aluminum alloy material is treated with silver-white oxidation, which has strong corrosion resistance and extends the service life of the product; the filter can be disassembled and replaced without tools, which improves maintenance efficiency and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a front view of a ventilation and protection shutter with negative pressure labyrinth structure blades according to the present invention; Figure 2 This is a structural schematic diagram of a ventilation and protection shutter with negative pressure labyrinth structure blades according to the present invention; Figure 3 This is a partial enlarged view of a ventilation and protection shutter with negative pressure labyrinth structure blades according to the present invention; Figure 4 This is a schematic cross-sectional view of a blade of a ventilation and protection shutter having a negative pressure labyrinth structure blade according to the present invention; Figure 5 This is a diagram of an airflow simulation combination of blades of a ventilation and protection shutter having a negative pressure labyrinth structure of blades according to the present invention; Figure 6 This is a CFD simulation airflow path diagram of a ventilation protection shutter with negative pressure labyrinth structure blades according to the present invention; Figure 7 This is a CFD simulation pressure diagram of a ventilation and protection shutter with negative pressure labyrinth structure blades according to the present invention; Figure 8 This is a structural schematic diagram of a frame of a ventilation and protection shutter with negative pressure labyrinth structure blades according to the present invention; Figure 9 This is a schematic structural diagram of a quick-install plastic block for a ventilation and protection shutter having blades with a negative pressure labyrinth structure according to the present invention; Figure 10 This is a structural schematic diagram of a fixed corner piece of a ventilation and protection shutter with negative pressure labyrinth structure blades according to the present invention; Figure 11 This is a schematic structural diagram of a filter for a ventilation protection shutter having blades with a negative pressure labyrinth structure according to the present invention; Figure 12 This is a structural schematic diagram of a fixing part of a ventilation and protection shutter with negative pressure labyrinth structure blades according to the present invention. DETAILED DESCRIPTION

[0017] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the present invention is described in detail below with reference to the embodiments.

[0018] like Figure 1 、 Figure 2 and Figure 4 A ventilation and protection shutter with blades having a negative pressure labyrinth structure comprises blades 100 and a frame 200; The frames 200 are connected in sequence to form a rectangular frame. The frame 200 serves as the skeleton of the blinds and fixes the blades 100 through the rectangular design to ensure the stability of the overall structure.

[0019] The blade 100 is fixed in the frame 200; the blade 100 includes a body 110, a first water retaining portion 120, and a second water retaining portion 130. The cross section of the body 110 is a V-shaped baffle. The body 110 includes a first side 111 and a second side 112. The first water retaining portion 120 and the second water retaining portion 130 are fixed to the first side 111. The second water retaining portion 130 is arranged at the top corner of the body 110, and the first water retaining portion 120 is arranged below the second water retaining portion 130. Rainwater is forced to slide down the surface of the blade 100 under the action of gravity. The design of the first water retaining portion 120 and the second water retaining portion 130 intercepts rainwater and dust, thereby ensuring the protective effect of the device.

[0020] Furthermore, the cross section of the first water retaining portion 120 is arc-shaped, one side of the first water retaining portion 120 is connected to the first side edge 111, and the opening of the first water retaining portion 120 faces downward. The cross section of the second water retaining portion 130 is L-shaped, and the second water retaining portion 130 includes a first plate 131 and a second plate 132. The first plate 131 is formed by the second side edge 112 extending outward in the vertex direction. The upper end of the second plate 132 is connected to the end of the first plate 131 away from the second side edge 112, and the second plate 132 is parallel to the first side edge 111. Through this design, rainwater and dust are intercepted, the possibility of rainwater splashing is reduced, and the protection effect is improved.

[0021] Furthermore, the first side edge 111 has an inclination angle of 40-45°, and the top angle of the body 100 is rounded, with the angle of the top angle exceeding 90°, ensuring that the first side edge 111 forms a downward diversion angle, and rainwater slides down the surface of the blade 100 under the action of gravity.

[0022] The unique cross-sectional shape of blade 100 is based on CFD fluid dynamics simulations. The lower end of first side 111 serves as the initial contact point for rainwater and dust. Designed with a 40-45° angle, first side 111 creates a downward diversion angle, allowing rainwater to quickly slide down the blade 100 surface due to gravity, reducing the risk of water accumulation. This also disperses wind pressure, reduces the risk of blade 100 deformation, and enhances overall structural stability. Rainwater is forced to slide down the blade 100 surface under the influence of gravity, preventing it from splashing into the charging station or energy storage cabinet. A first water retaining element 120 intercepts some rainwater and dust entering the device with the airflow. Second water retaining element 130 employs a labyrinthine water-retaining path. Even if rainwater and dust break through this initial barrier, they are intercepted again by the second water retaining element 130, significantly reducing the possibility of splash penetration. Furthermore, the 92° vertical angle shifts the separation point backward as airflow passes through the V-shaped opening, minimizing vortex generation, reducing drag, and enhancing heat dissipation.

[0023] Two sets of identical blades 100 are staggered within the frame 200. Each set of blades 100 is arranged along the height of the rectangular frame, with the first water retaining portion 120 and the second water retaining portion 130 facing the windward side. The overall blade shape of the Venetian blind, formed by the staggered arrangement of two identical blades 100, resembles a maze-like structure, which effectively intercepts rainwater and dust.

[0024] Further, such as Figure 3 The arrangement spacing of the 100 blades of the blinds was obtained by CFD simulation verification. In each group of blades 100, the upper and lower spacing between two adjacent blades 100 is the same, and the upper and lower spacing between two adjacent blades 100 is 8-10mm. The left and right spacing between the two groups of blades 100 is 5-6mm. The spacing between the blades and the arrangement spacing are certain. The upper and lower spacing of the blades 100 is 10mm, and the left and right spacing is 5mm. This spacing has been verified by CFD simulation ( Figure 6 ), which can effectively block rain and dust while ensuring sufficient ventilation. The blades 100 are combined to form multiple airflow channels. When the airflow passes through these channels, the direction changes, forming acceleration zones and vortex zones.

[0025] like Figure 5 and Figure 6, the lower end 1 of the first side 111 of the blade 100 is the first contact point of the airflow, and rainwater / sand dust first passes through here. The first side 111 of the blade 100 is tilted 40-45 degrees, so that part of the rainwater / sand dust can flow down by itself due to its own weight. The first water retaining portion 120 is the first interception section, which can intercept part of the rainwater / sand dust. The second water retaining portion 130 is the second interception section. The larger angle bending design makes the airflow converge here to form a vortex, intercepting rainwater / sand dust; other airflow will enter the middle of the inner top corner 4 of the blade and the second side 112. Because the airflow is forced to turn to form a narrow channel, an acceleration zone will be formed here, and part of the airflow will hit the end 5 of the second side 112 of the blade 100. Because the two groups of blades With a design of about 5mm on blade 100, most of the rain / dust will bounce back or fall onto the first side 111 of the second set of blades on the rear side, similar to the effects of the first side 111, first water retaining portion 120, and second water retaining portion 130 of the front blade, and will eventually flow to the bottom of the blinds with the airflow; at the same time, the airflow will suddenly spread after squeezing through the narrow gap at high speed, and the pressure difference will pull the airflow to rotate. Due to the viscosity of the fluid, when airflows of different speeds mix, a rotating vortex will be formed, which will continue to develop through shearing action, and eventually a stable vortex zone will be formed at the inner top corner 4 of the front blade 100 and the second side 112 (above the acceleration zone), the front blade 5, and the rear blade 6 (below the acceleration zone). Due to the effect of the first section of the acceleration zone, the initial velocity of the airflow entering points 8 and 9 of the rear blade 100 will be greater than the initial wind speed entering the blinds, attracting more air to pass through the gap quickly. Therefore, the faster the flow rate, the lower the pressure, forming a low-pressure or even negative-pressure zone. CFD simulation shows ( Figure 7 ), the negative pressure value formed in this area is about -5Pa, which can effectively block water droplets and dust particles with a diameter of less than 50μm; at the same time, a second acceleration zone will be formed; due to the effect of the first acceleration zone, the air flow speed in the second acceleration zone will be faster. Similarly, vortices will be generated above and below the acceleration zones at blades 9 and 10 (the principle is the same as the reason for the vortices generated at blades 4 and 5, and blades 5 and 6 on the front side); because after the negative pressure is formed in the second acceleration zone, the high-speed airflow will "entrain" most of the rain / dust, and make continuous high-speed turns at blades 9 and 10, which will cause this part of the rain / dust to collide and slide to blade 11, reducing the probability of rainwater entering the rear end. After the airflow passes through continuous Z-shaped turns, CFD simulation data shows that under wind speed conditions of 2m / s, this design can block more than 95% of rainwater and dust particles with a diameter greater than 10μm. At the same time, the resistance of the blinds at this wind speed is only 83Pa (see Figure 7 ), which is about 40% lower than traditional blinds, greatly improving ventilation and heat dissipation efficiency.

[0026] Furthermore, the frame 200 is made of aluminum alloy, and the blade 100 is made of aluminum alloy. The surfaces of the frame 200 and the blade 100 are respectively treated with silver-white oxidation. The lightweight design ensures the strength of the blade and avoids deformation. The frame 200 is made of 6063 aluminum alloy and serves as the main frame of the blinds. It plays a mechanical support role of the overall structure and ensures the service life of the device. The surfaces of the frame 100 and the blade 200 are respectively treated with silver-white oxidation, which has strong corrosion resistance and improves corrosion resistance. Combine Figure 8 The cross section of the frame 200 is L-shaped, and the connection between two adjacent frames 200 is connected and fixed by a fixed corner piece 300. Figure 1 and 10 The fixed angle piece 300 is L-shaped as a whole, and the two sides of the fixed angle piece 300 are respectively connected to the two frames 200. The fixed angle piece 300 is made of stainless steel, which can resist salt spray corrosion. It is L-shaped as a whole, with a thickness of 1mm, which tightly connects the adjacent frames 200 of the blinds to form a stable right-angle support structure. This design can effectively disperse the force on the frame 200, prevent deformation or loosening due to external force or vibration, and ensure the rigidity of the overall rectangular frame. The overall modular design of the rectangular frame forms a stable right-angle structure, which improves the overall resistance of the blinds to wind pressure deformation.

[0027] Furthermore, it also includes quick-install plastic blocks 400, which are fixed to the inner sides of the frames 200 on both sides of the rectangular frame. The quick-install plastic blocks 400 are equidistantly arranged along the height direction of the rectangular frame, such as Figure 9 The quick-install plastic block has slots 410, into which the ends of the blades 100 are respectively secured for installation. The quick-install plastic block 400 has two sets of slots 410 corresponding to the staggered blades, which, together with the blades 100, function to secure the blinds. The slots 410 in the quick-install plastic block 400 precisely position the blades 100, ensuring that adjacent blades 100 maintain a precise spacing of 10mm. This spacing, verified as optimal by CFD simulation, prevents direct dust ingress while ensuring ventilation efficiency.

[0028] The quick-release plastic block 400 is made of weather-resistant and durable ABS material. It is resistant to various chemicals (such as alcohol, iodine, weak acids and bases), is not easily corroded, and is easy to clean. It is manufactured using an integrated mold. This mold-based production ensures consistent installation angles and spacing for each blade 100, eliminating manual assembly errors.

[0029] Furthermore, it also includes a filter 500, and the blade 100 can be installed on the air inlet surface, and the air outlet surface is matched with the filter 500 to further reduce the probability of dust / rainwater passing through and improve the protection effect of the device. Figure 11 The size of the filter 500 matches the size of the rectangular frame. The filter 500 includes a first frame 510 and a filter element 520. The filter element 520 is fixed in the first frame 510. The filter element 520 is made of polyurethane or chemical fiber material. Figure 2 The filter 500 is mounted on the rear side of the blades 100, near the air outlet. The filter 500 has a cubic structure and a thickness of 10 mm, adapted to the size of the blind frame 200. The first frame 510 of the filter is made of 6063 aluminum alloy and is 1 mm thick. The filter element 520 is selected based on filtration efficiency and is generally made of polyurethane or chemical fiber, which can effectively block fine dust. The edge of the filter 500 is also sealed within the frame 200 via a seal to ensure tightness. The filter 500 and the blind blades 100 form a double insurance, blocking the infiltration path of rainwater and sand.

[0030] Further, such as Figure 2 and Figure 12 , further comprising a fixing member 600, the fixing member 600 comprising a cantilever beam 610 and a hook-shaped protrusion 620, through holes 611 being provided near both ends of the cantilever beam 610, one end of the hook-shaped protrusion 620 being hinged to the cantilever of the cantilever beam 610, and one side of the hook-shaped protrusion 620 having a hook plate 621 bent outward; Figure 3The frame 200 includes a first flange 201 and a second flange 202. The first flange 201 is provided with mounting holes for securing the device therethrough. A baffle 203 is also provided on the inner side of the second flange 202, positioned near the air outlet surface for mounting the filter 500. The cantilever beam 610 is secured to the end surface of the second flange 202, away from the first flange 201, via a through-hole. The fixing member 600 is symmetrically positioned on either side of the rectangular frame. The hook-shaped protrusions 621 on either side are positioned opposite each other. The hook-shaped protrusions are rotated 90 degrees to press the filter 500 into the frame 200. The fixing member 600 is made of stainless steel and consists of a cantilever beam 610 and a hook-shaped protrusion 620. The cantilever beam 610 is 55 mm long, 7 mm wide, and 1 mm thick; the hook-shaped protrusion 620 is 10 mm long, 7 mm wide, and 1 mm thick. Cantilever beam 610 and hook-shaped protrusion 620 are hingedly fixed via copper rivets. This rivet fixation allows hook-shaped protrusion 620 to rotate 90 degrees. By rotating hook-shaped protrusion 620, hook-shaped protrusion 620 contacts filter 500, and the air inlet surface of filter 500 presses against baffle 203, filter 500 is installed. This design allows filter 500 to be fixed and easily removed for replacement without tools, improving maintenance efficiency. Fixing member 600 is also made of stainless steel, resistant to salt spray corrosion and extending its service life.

[0031] The present invention has been described with reference to the above embodiments. However, the above embodiments are merely exemplary embodiments of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and improvements that do not depart from the spirit and scope of the present invention are intended to be protected by the present invention.

Claims

1. A ventilation and protection shutter with negative pressure labyrinth structure blades, characterized by: Including blades and borders; The frames are connected in sequence to form a rectangular frame, and the blades are fixed in the frames; The blade includes a body, a first water retaining portion and a second water retaining portion, the cross section of the body is a V-shaped baffle, the body includes a first side and a second side, the first water retaining portion and the second water retaining portion are fixed on the first side, the second water retaining portion is arranged at the top corner of the body, and the first water retaining portion is arranged below the second water retaining portion; Two groups of blades with the same structure are designed in the frame and arranged in a staggered manner. Each group of blades is arranged along the height direction of the rectangular frame, and the first water retaining part and the second water retaining part are arranged towards the wind inlet surface.

2. The ventilation and protection shutter with negative pressure labyrinth structure blades according to claim 1, characterized in that: The cross-section of the first water retaining portion is arc-shaped, one side of the first water retaining portion is connected to the first side edge, the opening of the first water retaining portion is facing downward, the cross-section of the second water retaining portion is L-shaped, the second water retaining portion includes a first plate and a second plate, the first plate is formed by the second side edge continuing to extend outward in the direction of the top angle, the upper end of the second plate is connected to the end of the first plate away from the second side edge, and the second plate is parallel to the first side edge.

3. The ventilation and protection shutter with negative pressure labyrinth structure blades according to claim 2, characterized in that: The inclination angle of the first side is 40-45°, the top angle of the body is rounded, and the angle of the top angle exceeds 90°.

4. The ventilation and protection shutter with negative pressure labyrinth structure blades according to claim 1, characterized in that: CFD simulation verifies the blade arrangement spacing of the blinds. In each group of blades, the upper and lower spacing between two adjacent blades is the same, the upper and lower spacing between two adjacent blades is 8-10mm, and the left and right spacing between the two groups of blades is 5-6mm.

5. The ventilation and protection shutter with negative pressure labyrinth structure blades according to claim 1, characterized in that: The frame is made of aluminum alloy, and the blades are made of aluminum alloy through integrated connection. The surfaces of the frame and the blades are respectively treated with silver-white oxidation.

6. The ventilation and protection shutter with negative pressure labyrinth structure blades according to claim 1, characterized in that: The cross section of the frame is L-shaped, and the connection between two adjacent frames is connected and fixed by a fixed angle piece. The fixed angle piece is L-shaped as a whole, and the two side edges of the fixed angle piece are respectively connected to the two frames.

7. The ventilation and protection shutter with negative pressure labyrinth structure blades according to claim 1, characterized in that: It also includes a quick-release plastic block, which is fixed on the inner side of the frame on both sides of the rectangular frame. The quick-release plastic blocks are equidistantly arranged along the height direction of the rectangular frame. The quick-release plastic block has a card slot, and the two ends of the blade are respectively fixed in the card slot for installation.

8. The ventilation and protection shutter with negative pressure labyrinth structure blades according to claim 1, characterized in that: It also includes a filter, the size of which matches the size of the rectangular frame. The filter includes a first frame and a filter element. The filter element is fixed in the first frame. The filter element is made of polyurethane or chemical fiber material. The filter is installed on the rear side of the blade and is arranged close to the wind outlet surface.

9. The ventilation and protection shutter with negative pressure labyrinth structure blades according to claim 8, characterized in that: It also includes a fixing part, which includes a cantilever beam and a hook-shaped protrusion, through holes are provided near the two ends of the cantilever beam, one end of the hook-shaped protrusion is hinged to the cantilever of the cantilever beam, and one side of the hook-shaped protrusion has a hook plate bent outward; the frame includes a first flange and a second flange, the first flange is provided with a mounting hole, and the inner side of the second flange is also provided with a baffle, the baffle is arranged close to the air outlet surface, the cantilever beam is fixed on the end face of the second flange away from the first flange through the through hole, the fixing parts are symmetrically arranged on both sides of the rectangular frame, and the hook-shaped protrusion is rotated 90° to press the filter into the frame.

10. The ventilation and protection shutter with negative pressure labyrinth structure blades according to claim 7, characterized in that: The quick-install plastic block is made of ABS material and is produced using an integrated mold.

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