Tool-free plugging dust filtering device for air inlet of machine room cabinet

Abstract

This utility model provides a tool-free, plug-and-play air intake dust filter device for server racks, belonging to the technical field of air intake dust filter devices. The tool-free, plug-and-play air intake dust filter device for server racks includes: a filter body; a continuous elastic sealing ring surrounding the back of the filter body; an outer frame fixed to the front of the filter body; an involute cam lock located at the corner of the outer frame; and an arc-shaped locking groove formed around the periphery of the server rack's air inlet, cooperating with the involute cam lock. The involute cam lock is installed with its rotation axis perpendicular to the plane of the outer frame, with the involute working surface facing the arc-shaped locking groove. The elastic sealing ring is located between the outer frame and the end face of the server rack's air inlet. When the outer frame is inserted into the server rack's air inlet, rotating the outer frame causes the involute cam lock to slide along the arc-shaped locking groove, and the involute working surface continuously pushes against the inner wall of the arc-shaped locking groove. This solves the problems of time-consuming disassembly and maintenance of traditional server rack filters and uneven sealing leading to air leakage.

Description

Technical Field

[0001] This utility model belongs to the technical field of air intake dust filtration devices, specifically, it relates to a tool-free plug-and-play air intake dust filtration device for computer room cabinets. Background Technology

[0002] In data centers, communication base stations, and various server rooms, server racks typically employ front-in, rear-out or side-in, top-out airflow configurations to draw cool indoor air into the rack for cooling servers, power supplies, and switching equipment. To prevent dust, fibers, metal shavings, and other impurities from entering the rack with the airflow, dust filters must be installed at the air inlets. Traditional server rack air intake filters generally consist of a metal or plastic frame and a flat filter screen. The frame is secured to the rack opening with screws, pins, plastic clips, or magnetic strips, and the filter screen is made of non-woven fabric, nylon mesh, or woven metal mesh.

[0003] However, with the increase in data center density and maintenance frequency, traditional structures have revealed significant drawbacks. First, the fixing method relies on tools such as screwdrivers and wrenches, which is time-consuming to install and remove, and in scenarios with densely packed racks, the space for tool operation is extremely limited. Second, clips or magnetic strips are prone to breakage and demagnetization after repeated installation and removal, leading to loose filters and air leaks. Third, the filters are sealed only by localized pressure or a single sealing strip, resulting in uneven stress; after long-term use, the sealing strip collapses in some areas, creating gaps and allowing dust to leak out. Furthermore, traditional filter frames are mostly rigid structures, unable to adapt to minute dimensional deviations in rack openings, further exacerbating poor sealing. Most notably, maintenance personnel often need to shut down or partially shut down the system to replace filters, impacting business continuity. Utility Model Content

[0004] In view of this, the present invention provides a tool-free plug-and-play air intake dust filter device for computer room cabinets, which solves the problems of time-consuming disassembly and maintenance of traditional cabinet filters and uneven sealing that easily leads to air leakage.

[0005] This utility model is implemented as follows: This utility model provides a tool-free, plug-and-play air intake dust filter device for server racks in computer rooms, comprising: Filter body; A continuous elastic sealing ring surrounds the back of the filter body; The outer frame is fixed to the front of the filter body; An involute cam lock is located at the corner of the outer frame; An arc-shaped locking groove is provided around the air inlet of the cabinet and cooperates with the involute cam lock; The involute cam lock is installed with its rotation axis perpendicular to the plane of the outer frame. The involute working surface faces the arc-shaped lock groove, and the elastic sealing ring is located between the outer frame and the air inlet end face of the cabinet. When the outer frame is embedded in the air inlet of the cabinet, the involute cam lock slides along the arc-shaped lock groove by rotating the outer frame. The involute working surface continuously pushes the inner wall of the arc-shaped lock groove, thereby pulling the entire outer frame closer to the end face of the cabinet and compressing the elastic sealing ring to form a circumferential seal. The lock can be released by rotating the outer frame in the opposite direction.

[0006] The technical advantages of the tool-free plug-and-play air intake dust filter device for server racks provided by this utility model are as follows: Through the pure mechanical linkage of "involute cam lock - arc-shaped locking groove - continuous elastic sealing ring", the sealing ring can be synchronously pressed in 360° circumference by simply rotating the outer frame with one hand. This not only avoids the local stress concentration of traditional screws or clips, but also significantly shortens the disassembly and assembly time, achieving true tool-free quick disassembly and assembly, and allows for quick replacement of the filter screen without interrupting airflow during rack operation.

[0007] Based on the above technical solution, the tool-free plug-in air intake dust filter device for server racks of this utility model can be further improved as follows: The involute cam lock includes a cam base and an integrally formed involute curved surface. The cam base is pivotally connected to the corner of the outer frame via a pivot shaft, and the axis of the pivot shaft is located on the mid-plane of the outer frame in the thickness direction.

[0008] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the cam base and the rotating shaft are set on the central surface in the thickness direction of the outer frame, so that the axial component force generated when the cam pushes coincides with the plane of the outer frame, thus eliminating the warping and deformation of the outer frame. At the same time, the rotating shaft is hidden inside and not exposed, which not only prevents accidental touch but also keeps the appearance clean.

[0009] Furthermore, the arc-shaped lock groove extends in an arc along the periphery of the cabinet air inlet, and its bottom contour forms a conjugate fit with the involute curved surface of the involute cam lock. The groove opening width is greater than the thickness of the cam base, and the groove bottom width is less than the groove opening width to form a self-locking surface.

[0010] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the "wide groove opening - narrow groove bottom" structure of the arc-shaped locking groove forms a self-locking surface after the cam slides in, so that it will not be accidentally loosened even if the cabinet is transported or vibrated; while the conjugate curved surface design ensures that the rotational torque is always kept at a low level, and locking or unlocking can be completed with one hand.

[0011] Furthermore, the elastic sealing ring is a hollow annular silicone ring with a closed annular outer contour and a hollow inner cavity. The sealing ring is fixed by an annular groove embedded on the back of the outer frame, and the groove depth is less than the diameter of the sealing ring cross section.

[0012] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the hollow annular silicone ring deforms uniformly as a whole when under pressure, which not only provides sufficient rebound force to ensure sealing, but also absorbs minor processing errors of the cabinet; the cavity structure also significantly reduces its weight and material cost, and the permanent deformation after long-term compression is minimal.

[0013] Furthermore, the outer frame has a flange surrounding the filter body on its back side, an annular groove is formed on the inner side of the flange, and a limiting step is formed between the outer side of the flange and the edge of the outer frame to limit the radial displacement of the elastic sealing ring.

[0014] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the flange and the limiting step together form the "groove-barrier" structure of the sealing ring, which not only prevents the sealing ring from slipping off during disassembly and assembly, but also forms a secondary reinforcing rib on the outer frame, improving the overall rigidity and extending the service life.

[0015] Furthermore, the outer frame is rectangular in shape, with involute cam locks arranged at the four corners of the outer frame, and arc-shaped lock grooves located at the four corners of the air inlet of the cabinet. The cam locks and arc-shaped lock grooves correspond one-to-one.

[0016] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the symmetrical arrangement of the cam locks and arc-shaped locking grooves at the four corners ensures that the outer frame is subjected to uniform force and the filter screen is pressed synchronously around the perimeter, avoiding air leakage caused by one side tilting up; the rectangular outer frame is compatible with the standard cabinet opening and can directly replace the existing filter screen without modifying the cabinet.

[0017] Furthermore, the outer frame has recessed portions on opposite sides for finger gripping, the recessed portions are located between the involute cam locks, and the bottom surface of the recessed portions is lower than the surface of the outer frame.

[0018] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the recessed part becomes a natural handle when rotating, and the operator's fingers can be directly inserted and feel the rotation angle without the need for additional tools, and will not damage the filter due to slipping; the recessed part also reduces the weight of the outer frame, achieving a lightweight structure.

[0019] Furthermore, the involute cam lock has an involute curved surface at the starting end, which forms a guide slope with the entrance end face of the arc-shaped lock groove to reduce the initial insertion resistance.

[0020] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the guide slope plays a guiding role in the insertion stage, significantly reducing the initial resistance, avoiding misalignment of the cam and the locking groove during "blind insertion", improving the success rate of the first installation, and further shortening the on-site maintenance time.

[0021] Furthermore, the outer surface of the elastic sealing ring is provided with circumferentially distributed flexible lips, which extend radially outward along the sealing ring, and a V-shaped buffer groove is formed between the root of the lip and the sealing ring body.

[0022] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the flexible lip folds outward when the sealing ring is under pressure, forming a secondary sealing barrier. Even if the sealing ring body experiences minor wear, the lip can still compensate for the gap, so that the overall sealing performance remains stable throughout the entire life cycle of the equipment.

[0023] Furthermore, the outer frame, involute cam lock, and arc-shaped lock groove are all made of non-metallic materials, and there are no metal fasteners between the outer frame and the involute cam lock. The entire device achieves tool-free locking and unlocking with the cabinet by rotating the outer frame.

[0024] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the all-non-metallic structure eliminates the maintenance risks caused by the corrosion and electrochemical corrosion of metal parts, while eliminating small parts such as screws and springs. The entire device can be injection molded or machined in a cleanroom in one go, resulting in low batch cost and meeting the data center's requirements for non-magnetic and low-dust. It can be used in just three steps: "insert-rotate-in place" and can be pulled out by rotating in the opposite direction, truly achieving "second-level" maintenance of the cabinet's air intake filter.

[0025] Compared with existing technologies, the advantages of this utility model for a tool-free, plug-and-play air intake dust filter for server racks are as follows: Based on a purely mechanical structure of "involute cam lock + continuous elastic sealing ring," this utility model integrates four major functions—locking, sealing, guiding, and self-compensation—into a single kinematic pair, achieving tool-free quick installation and removal in three steps: "insertion—rotation—positioning." The outer frame and the rack are connected via a conjugate fit between the involute curved surface and the arc-shaped locking groove, generating a continuous, uniform, and gradually increasing axial clamping force during rotation. This causes the elastic sealing ring to compress synchronously in the 360° circumference, forming a tight fit without dead angles, thus completely eliminating the problems of local overpressure, local loosening, and sealing strip collapse commonly found in traditional point-pressure structures. Because the sealing ring uses hollow annular silicone with a flexible lip, its elasticity automatically compensates for gaps caused by manufacturing errors or thermal expansion and contraction at rack openings, ensuring long-term stable sealing. The involute cam lock and arc-shaped locking groove self-locking surface design ensures the filter remains locked even under transport vibration or airflow impact, preventing accidental loosening. Reverse rotation instantly releases the lock, enabling true one-handed operation. Furthermore, the cam locks at the corners of the outer frame are aligned with the central face of the outer frame's thickness, ensuring rotational force acts directly on the outer frame plane, avoiding warping caused by traditional lateral latches. Symmetrically arranged cam locks at the four corners of the outer frame ensure even force distribution, synchronously pressing the filter around its perimeter, further extending the lifespan of the sealing ring. The recessed handle, inclined guide surface, and all-non-metallic material design not only reduce weight and cost but also eliminate the risks of rust, magnetic dust adsorption, and electrochemical corrosion, meeting the long-term operational needs of high-density, high-cleanliness computer rooms. Overall, this device improves sealing reliability while reducing maintenance time to a fraction of traditional solutions, significantly minimizing manual intervention, ensuring business continuity, and lowering total lifecycle maintenance costs. Attached Figure Description

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

[0027] Figure 1 An example diagram of a tool-free plug-and-play air intake dust filter device for server racks in a computer room; Figure 2 A front view of a tool-free, pluggable air intake dust filter device for server racks in a computer room; Figure 3 A side view of a tool-free, pluggable air intake dust filter device for a server rack in a computer room; The attached diagram lists the components represented by each number as follows: 10. Filter body; 11. Flange; 20. Elastic sealing ring; 30. Outer frame; 40. Involute cam lock. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0029] like Figures 1-3 The diagram shown is an example of a tool-free, plug-and-play air intake dust filter device for server racks provided by this utility model, comprising: Filter body 10; A continuous elastic sealing ring 20 surrounds the back of the filter body 10; The outer frame 30 is fixed to the front of the filter body 10; An involute cam lock 40 is located at the corner of the outer frame 30. An arc-shaped locking groove is provided around the air inlet of the cabinet and cooperates with the involute cam lock 40; The involute cam lock 40 is installed with its rotation axis perpendicular to the plane of the outer frame 30. The involute working surface faces the arc-shaped lock groove, and the elastic sealing ring 20 is located between the outer frame 30 and the end face of the cabinet air inlet. When the outer frame 30 is embedded in the cabinet air inlet, the involute cam lock 40 slides along the arc-shaped lock groove by rotating the outer frame 30. The involute working surface continuously pushes the inner wall of the arc-shaped lock groove, thereby pulling the outer frame 30 as a whole closer to the end face of the cabinet and compressing the elastic sealing ring 20 to form a circumferential seal. The lock can be released by rotating the outer frame 30 in the opposite direction.

[0030] In the above technical solution, the involute cam lock 40 includes a cam base and an integrally formed involute curved surface. The cam base and the corner of the outer frame 30 are pivotally connected by a rotating shaft, and the axis of the rotating shaft is located on the central surface of the outer frame 30 in the thickness direction.

[0031] Furthermore, in the above technical solution, the arc-shaped lock groove extends in an arc along the periphery of the air inlet of the cabinet, and its bottom contour forms a conjugate fit with the involute curved surface of the involute cam lock 40. The groove opening width is greater than the thickness of the cam base, and the groove bottom width is less than the groove opening width to form a self-locking surface.

[0032] Furthermore, in the above technical solution, the elastic sealing ring 20 is a hollow annular silicone ring with a closed annular outer contour and a hollow inner cavity. The sealing ring is fixed by an annular groove embedded on the back of the outer frame 30, and the groove depth is less than the diameter of the sealing ring cross section.

[0033] Furthermore, in the above technical solution, the back of the outer frame 30 is provided with a flange 11 surrounding the filter body 10, an annular groove is formed on the inner side of the flange 11, and a limiting step is formed between the outer side of the flange 11 and the edge of the outer frame 30 to limit the radial displacement of the elastic sealing ring 20.

[0034] Furthermore, in the above technical solution, the outer frame 30 is rectangular in shape, the involute cam lock 40 is arranged at the four corners of the outer frame 30, the arc-shaped lock groove is located at the four corners of the air inlet of the cabinet, and the cam lock and the arc-shaped lock groove correspond one-to-one.

[0035] Furthermore, in the above technical solution, the outer frame 30 has recessed parts on opposite sides for finger gripping, the recessed parts are located between the involute cam locks 40, and the bottom surface of the recessed parts is lower than the surface of the outer frame 30.

[0036] Furthermore, in the above technical solution, the involute cam lock 40 has an involute curved surface at the starting end, which forms a guide slope with the entrance end face of the arc-shaped lock groove to reduce the initial insertion resistance.

[0037] Furthermore, in the above technical solution, the outer surface of the elastic sealing ring 20 is provided with circumferentially distributed flexible lips, which extend radially outward along the sealing ring, and a V-shaped buffer groove is formed between the root of the lip and the sealing ring body.

[0038] Furthermore, in the above technical solution, the outer frame 30, the involute cam lock 40, and the arc-shaped lock groove are all made of non-metallic materials. There are no metal fasteners between the outer frame 30 and the involute cam lock 40. The entire device achieves tool-free locking and unlocking with the cabinet by rotating the outer frame 30.

[0039] First embodiment: For data centers employing cold aisle enclosure technology, server racks are arranged face-to-face to form a closed cold aisle, with the front door of the rack serving as the air intake surface, requiring frequent online filter replacements.

[0040] A rectangular filter unit is embedded in the front door opening of a standard server rack that is 600mm wide and 42U high. The outer frame is made of glass fiber reinforced nylon injection molded with uniform wall thickness and involute cam locks integrally formed at the four corners. The corresponding position on the steel frame of the rack front door is stamped with an arc-shaped locking groove that is conjugate to the cam lock, and a 2mm chamfer is added to the groove opening as an guide slope. The filter body is a double-layer nylon mesh with a PET support layer, which is heat-pressed into the outer frame on all sides. The back is completely covered with a continuous silicone hollow sealing ring. The outer diameter of the sealing ring is slightly larger than the depth of the groove on the back of the outer frame, so that it protrudes naturally by about 0.5mm after insertion.

[0041] Maintenance personnel open the front door of the cold aisle, support the filter unit with one hand, and align the upper edge of the outer frame with the cabinet opening. The cam lock guide surface naturally slides into the arc-shaped lock groove entrance. Then, rotate the outer frame clockwise by about 10°. The involute curved surface rolls within the lock groove, generating a gradually increasing axial tension. The entire outer frame moves closer to the cabinet end face, and the sealing ring is evenly compressed until a "click" is heard indicating that it is in place, completing the locking process. To disassemble, rotate the outer frame in the opposite direction and gently pull it. The cam lock releases its self-locking mechanism, the sealing ring springs back, and the filter unit automatically pops out about 5mm, allowing it to be removed as a whole.

[0042] Second embodiment: For outdoor integrated communication cabinets, the side air inlets are exposed to wind, sand, rain and salt spray all year round, so they need to be both waterproof and dustproof, and the tools that maintenance personnel can carry are limited.

[0043] The cabinet side panel features a 400mm x 300mm rectangular air inlet, surrounded by a welded stainless steel reinforcing frame. The filter unit's outer frame is made of UV-resistant polycarbonate through a single injection molding process, with a thickness of 3mm. Involute cam locks are also arranged at the four corners, but the cam lock shafts are fitted with stainless steel bushings to improve wear resistance. Arc-shaped lock grooves are directly milled into the inner side of the stainless steel reinforcing frame, with drainage holes added to the bottom of the grooves. The filter body is made of a composite of hydrophobic PP meltblown fabric and stainless steel wire mesh. A V-shaped flexible lip is added to the outer side of the silicone hollow sealing ring on the back, forming a secondary seal with the cabinet end face and also serving as a water-retaining eave.

[0044] Maintenance personnel can operate the system from the side of the cabinet without opening the main door. First, push the filter unit horizontally into the side opening; the cam lock guide surface will then slide into the lock groove. Next, rotate the outer frame counter-clockwise approximately 10°. The involute curved surface will roll within the lock groove and press against the sealing ring, while the lip simultaneously folds outward to fit against the cabinet end face, forming a double barrier. For disassembly, rotate clockwise and gently pull the outer frame; the filter unit will pop out completely and can then be removed for cleaning.

[0045] Specifically, the principle of this utility model is as follows: The core of this invention lies in utilizing the pure rolling-sliding composite motion between the involute cam surface and the arc-shaped locking groove to transform rotary input into continuous, controllable, and impact-free axial clamping output. The involute cam lock, with its rotating shaft as the center, has a working surface that satisfies the involute equation, theoretically forming a conjugate meshing with the corresponding surface of the arc-shaped locking groove. When the outer frame is inserted into the cabinet opening, the initial segment of the cam lock first contacts the guide slope of the locking groove entrance, forming a light pre-pressure to ensure that subsequent meshing does not jam. As the outer frame continues to rotate, the instantaneous contact point of the involute surface rolls along the inner wall of the locking groove, gradually increasing the contact radius and thus increasing the axial force, pushing the entire outer frame closer to the cabinet end face. Because the pressure angle of the involute surface remains constant during meshing, the axial force rises steadily, and the elastic sealing ring obtains almost the same compression at all points in the circumference, avoiding local overpressure or underpressure caused by uneven force distribution in traditional point-pressure structures. The cross-section of the arc-shaped locking groove is trumpet-shaped, with a wide opening and narrow bottom. When the cam lock rotates to the end of the locking groove, the point of maximum curvature and the point of narrowest bottom of the groove form a mechanical self-locking mechanism. Any external force attempting to rotate the outer frame in the opposite direction must overcome the resultant normal force between the involute curved surface and the locking groove. This resultant force is much greater than the inertial force generated by airflow impact or transportation vibration. Therefore, the filter screen has extremely high resistance to loosening in the locked state. When rotating in the opposite direction, the operator only needs to apply the same torque as when inserting to release the self-locking mechanism. The cam lock exits along the original path, the elastic sealing ring rebounds, and the filter screen instantly loosens, achieving quick disassembly with one hand. The elastic sealing ring is made of hollow annular silicone. When compressed, the internal cavity undergoes uniform volume deformation, causing the outer wall to expand outwards and form a surface-to-surface contact with the cabinet end face. The flexible lip on the outer wall surface folds outwards when the sealing ring is further compressed, forming a secondary sealing barrier. Even if the sealing ring itself wears, the lip can still compensate for gaps through its elasticity. Because the sealing ring is embedded in an annular groove on the back of the outer frame, the groove sidewall and the limiting step together restrict its radial displacement, preventing the sealing ring from slipping or twisting during assembly and disassembly. The outer frame, cam lock, and arc-shaped locking groove are all integrally molded from non-metallic materials, avoiding the problems of magnetization, rust, and electrochemical corrosion of metal parts. The rotation axis of the cam lock coincides with the central plane of the outer frame in the thickness direction, so that the rotational force is directly applied to the plane of the outer frame without generating additional bending moment, thereby preventing the outer frame from warping; the cam locks symmetrically arranged at the four corners of the outer frame make the filter screen subjected to force in a symmetrical closed loop, further reducing local stress concentration. The recessed handle at the front end of the outer frame works in conjunction with the guide slope, allowing the operator to sense the insertion depth and rotation angle without tools, reducing the probability of misoperation; In summary, this utility model transforms rotational motion into continuous, uniform, and self-locking axial compression through the conjugate engagement of the involute cam surface and the arc-shaped locking groove. Combined with the adaptive compensation of the hollow elastic sealing ring, it achieves tool-free, one-handed, quick, and reliable disassembly and assembly of the cabinet air intake filter, fundamentally solving the problems of uneven sealing, easy loosening, and time-consuming maintenance in traditional structures.

Claims

1. A tool-less pluggable dust filtering device for an air inlet of a machine room cabinet, characterized in that, include: Filter body; A continuous elastic sealing ring surrounds the back of the filter body; The outer frame is fixed to the front of the filter body; An involute cam lock is located at the corner of the outer frame; An arc-shaped locking groove is provided around the air inlet of the cabinet and cooperates with the involute cam lock; The involute cam lock is installed with its rotation axis perpendicular to the plane of the outer frame. The involute working surface faces the arc-shaped lock groove, and the elastic sealing ring is located between the outer frame and the air inlet end face of the cabinet. When the outer frame is embedded in the air inlet of the cabinet, the involute cam lock slides along the arc-shaped lock groove by rotating the outer frame. The involute working surface continuously pushes the inner wall of the arc-shaped lock groove, thereby pulling the entire outer frame closer to the end face of the cabinet and compressing the elastic sealing ring to form a circumferential seal. The lock can be released by rotating the outer frame in the opposite direction.

2. The tool-less pluggable dust filtering device for the air inlet of the machine room cabinet according to claim 1, characterized in that, The involute cam lock includes a cam base and an integrally formed involute curved surface. The cam base is pivotally connected to the corner of the outer frame via a pivot shaft, and the axis of the pivot shaft is located on the mid-plane of the outer frame in the thickness direction.

3. The tool-less pluggable dust filtering device for the air inlet of the machine room cabinet according to claim 2, characterized in that, The arc-shaped lock groove extends in an arc along the periphery of the air inlet of the cabinet. Its bottom contour forms a conjugate fit with the involute curved surface of the involute cam lock. The groove opening width is greater than the thickness of the cam base, and the groove bottom width is less than the groove opening width to form a self-locking surface.

4. The tool-less pluggable dust filtering device for the air inlet of the machine room cabinet according to claim 3, characterized in that, The elastic sealing ring is a hollow annular silicone ring with a closed annular outer contour and a hollow inner cavity. The sealing ring is fixed by an annular groove embedded on the back of the outer frame, and the groove depth is less than the diameter of the sealing ring cross section.

5. The tool-less pluggable dust filtering device for the air inlet of the machine room cabinet according to claim 4, characterized in that, The outer frame has a flange surrounding the filter body on the back side, an annular groove is formed on the inner side of the flange, and a limiting step is formed between the outer side of the flange and the edge of the outer frame to limit the radial displacement of the elastic sealing ring.

6. The tool-less pluggable dust filtering device for the air inlet of the machine room cabinet according to claim 5, characterized in that, The outer frame is rectangular in shape, with involute cam locks arranged at the four corners of the outer frame and arc-shaped lock slots located at the four corners of the air inlet of the cabinet. The cam locks and arc-shaped lock slots correspond one-to-one.

7. A tool-free, plug-and-play air intake dust filter device for server racks according to claim 6, characterized in that, The outer frame has recessed parts on opposite sides for finger gripping, the recessed parts are located between the involute cam locks, and the bottom surface of the recessed parts is lower than the surface of the outer frame.

8. The tool-less pluggable dust filtering device for the air inlet of the machine room cabinet according to claim 7, characterized in that, The involute cam lock has an involute curved surface at the starting end with an introductory slope. The introductory slope and the entrance end face of the arc-shaped lock groove form a guiding fit to reduce the initial insertion resistance.

9. The tool-less pluggable dust filtering device for the air inlet of the machine room cabinet according to claim 8, characterized in that, The outer surface of the elastic sealing ring is provided with circumferentially distributed flexible lips, which extend radially outward along the sealing ring, and a V-shaped buffer groove is formed between the root of the lip and the sealing ring body.

10. The tool-less pluggable dust filtering device for the air inlet of the machine room cabinet according to claim 9, characterized in that, The outer frame, involute cam lock, and arc-shaped lock groove are all made of non-metallic materials. There are no metal fasteners between the outer frame and the involute cam lock. The entire device achieves tool-free locking and unlocking with the cabinet by rotating the outer frame.

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