A filter paper holding structure of an air filter

Abstract

The utility model discloses a filter paper clamping structure of air filter, include: first joint, the first end of first joint is used for connecting the air inlet pipeline, second joint, the first end of second joint is used for connecting the air outlet pipeline, sealing ring, the second end of first joint and the second end of second joint are extruded sealing ring from the axial both sides of sealing ring and butt joint to constitute the sealed cylindrical cavity together. The utility model has the beneficial effects that: this technical scheme is through the positioning structure of first / second joint, the anti -loose and the limit design of fastener, and the innovation of quick -detachable gland, has solved " the problem of inaccurate positioning, sealing failure, complicated operation" etc. in traditional filter paper clamping structure, is especially suitable for the scene of air filter, industrial waste gas monitoring etc. and needs high -frequency replacement filter paper and the high reliability requirement, and its structure is simple, and the cost is controllable, possesses the remarkable practical value and market prospect.

Description

Technical Field

[0001] This utility model relates to the field of air filter technology, and in particular to a filter paper clamping structure for an air filter. Background Technology

[0002] Air filters, as key devices for removing particulate matter and impurities from the air, are widely used in air purification, industrial waste gas treatment, and vehicle environmental control. Filter paper, as the core component of the filter, directly affects filtration efficiency and maintenance costs due to the stability, sealing, and ease of replacement of its clamping structure. In existing technologies, filter paper clamping structures typically include mating joints, sealing rings, and fasteners. The fasteners press the joint and sealing ring together to secure the filter paper and seal the airflow channel.

[0003] In existing structures, filter paper is mostly fixed by axial compression between the joint and the sealing ring, without a dedicated positioning structure. During assembly, the filter paper is prone to center shift due to operational errors, or edge wrinkles may appear under airflow impact, resulting in a reduction in filtration area (measured offset can reach 2-3 mm, reducing filtration efficiency by 10%-15%). At the same time, the filter paper and the sealing ring are not tightly fitted, easily forming airflow bypass and reducing particulate matter retention. The sealing effect of the sealing ring depends on the fastening force of the fasteners, but the existing structure does not have a compression limit device: if the fasteners are locked too tightly, the sealing ring is prone to excessive deformation, leading to material fatigue failure (lifespan shortened to less than 200 disassembly and assembly cycles); if the locking is insufficient, gaps appear between the joint and the sealing ring, with a leakage rate of 5%-10%, which cannot meet the airtightness requirements of high-precision filtration scenarios (such as medical and semiconductor industries). Traditional structures require complete disassembly of fasteners (such as bolts and clamps) and separation of the joint to replace the filter paper, with each operation taking 5-8 minutes, and the filter paper is easily contaminated during disassembly. For scenarios requiring frequent filter paper replacement (such as industrial dust filtration, which requires replacement 2-3 times per day), the operation efficiency is low and the maintenance cost increases significantly. In vibration environments such as vehicles and construction machinery, existing fasteners (such as ordinary nuts) are prone to loosening due to continuous vibration, resulting in a decrease in fastening force (in the 2000Hz vibration test, the fastening force decrease rate exceeded 20% within 24 hours), which in turn caused joint separation, sealing ring failure, and even equipment shutdown.

[0004] Therefore, developing a filter paper clamping structure that is precise in positioning, stable in sealing, easy to assemble and disassemble, and highly resistant to vibration has become the key to improving the reliability and maintenance efficiency of air filters. Utility Model Content

[0005] The main technical problem solved by this utility model is to provide a filter paper clamping structure for an air filter, thereby solving one or more of the above-mentioned prior art problems.

[0006] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a filter paper clamping structure for an air filter, the innovation of which is: comprising:

[0007] The first connector, the first end of the first connector is used to connect to the air intake pipe;

[0008] The second connector, the first end of which is used to connect to the air outlet pipe;

[0009] A sealing ring is formed by pressing the sealing ring from both axial sides of the first connector and the second connector together to form a sealed cylindrical cavity. Filter paper can be selectively sandwiched between the sealing ring and the second end of the first connector or the second end of the second connector.

[0010] Fasteners, the fasteners being used to apply a tightening force to prevent the separation of the first joint, the second joint and the sealing ring;

[0011] The sealing ring has an annular positioning groove on both axial end faces, and the edge of the filter paper is embedded in the annular positioning groove; the fastener includes a clamp with an anti-loosening structure, the inner wall of the clamp has an annular groove that matches the annular protrusion of the first connector and the second connector, and the annular groove has a limiting structure for limiting the compression of the sealing ring.

[0012] In some embodiments, the second end of the first connector is provided with a first annular protrusion, and the second end of the second connector is provided with a second annular protrusion. The first annular protrusion and the second annular protrusion are mated and jointly press the sealing ring, and the mating surfaces of the first annular protrusion and the second annular protrusion are provided with annular protrusions that are adapted to the annular positioning groove.

[0013] In some embodiments, the anti-loosening structure includes an anti-loosening nut and a disc spring washer, the open end of the clamp is connected by a threaded rod, the anti-loosening nut is threadedly connected to the threaded rod, and the disc spring washer is sleeved on the threaded rod and located between the anti-loosening nut and the open end of the clamp.

[0014] In some embodiments, the limiting structure includes a limiting boss disposed on the inner wall of the annular groove, the height of the limiting boss being 20% ​​to 30% of the initial thickness of the sealing ring, so as to limit the maximum compression of the sealing ring.

[0015] In some embodiments, the outer diameters of the first annular convex edge, the second annular convex edge, and the sealing ring are the same, and the inner diameter of the annular groove is adapted to the outer diameter of the first annular convex edge to form a circumferentially fully enclosed fastening.

[0016] In some embodiments, both the first connector and the second connector are constricted cylindrical structures, wherein the first port diameter of the first connector is smaller than its second port diameter, and the first port diameter of the second connector is smaller than its second port diameter.

[0017] In some embodiments, the sealing ring is made of fluororubber material, and the depth of the annular positioning groove is 0.5 to 1 mm, and the difference between its width and the thickness of the filter paper does not exceed 0.2 mm.

[0018] The beneficial effects of this utility model are as follows: This technical solution solves the problems of "inaccurate positioning, sealing failure, and cumbersome operation" in traditional filter paper clamping structures by improving the positioning structure of the first / second connector, the anti-loosening and limiting design of the fasteners, and the innovation of the quick-release cap. It is especially suitable for scenarios such as air filters and industrial exhaust gas monitoring that require frequent filter paper replacement and have high reliability requirements. Its structure is simple, the cost is controllable, and it has significant practical value and market prospects. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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, wherein:

[0020] Figure 1 This is a schematic diagram of the filter paper clamping structure of an air filter according to the present invention.

[0021] Figure 2 yes Figure 1 Cross-sectional view.

[0022] Figure 3 This is a schematic diagram of the first connector of the filter paper clamping structure of an air filter according to this utility model.

[0023] Figure 4 This is a schematic diagram of the second connector of the filter paper clamping structure of an air filter according to this utility model.

[0024] Figure 5 This is a schematic diagram of the sealing ring of the filter paper clamping structure of an air filter according to this utility model.

[0025] Figure 6 yes Figure 5 Cross-sectional view.

[0026] Figure 7 This is a structural diagram of the fastener for the filter paper clamping structure of an air filter according to this utility model. Detailed Implementation

[0027] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] like Figures 1 to 7 As shown, the present invention includes: a filter paper clamping structure for an air filter, which aims to solve the problems of easy filter paper displacement, unstable sealing, and cumbersome disassembly in existing clamping mechanisms, and is suitable for scenarios such as air purification and industrial waste gas treatment that require frequent filter paper replacement.

[0029] This filter paper clamping structure includes a first connector 100, a second connector 200, a sealing ring 300, a fastener 400, and filter paper. The specific structure and connection relationship of each component are as follows:

[0030] First connector 100: Made of stainless steel, with an overall "stepped cylindrical" structure, including a first cylindrical body extending axially and a first annular convex edge located at its second end.

[0031] First cylinder: It has a constricted design, with a first end (air inlet) diameter of 50mm, which is connected to the air inlet pipe (such as the upstream pipe of the air filter) by thread; the second end has an enlarged diameter of 80mm, which is used to mate with the sealing ring 300.

[0032] First annular protrusion: Extends radially outward along the second end of the first cylinder, with a width of 10mm and a thickness of 5mm. Its mating surface (the side facing the second connector 200) is provided with an annular protrusion 001, with a height of 0.3mm and a width of 1mm, for mating with the positioning groove of the sealing ring 300.

[0033] Second connector 200: Its structure is symmetrical to that of the first connector 100, including a second cylindrical body and a second annular protrusion.

[0034] The second cylinder also features a constricted design. The first end (air outlet) has a diameter of 50mm and connects to the air outlet pipe; the second end has a diameter of 80mm and connects to the sealing ring 300.

[0035] The second annular protrusion has the same width and thickness as the first annular protrusion. The mating surface is provided with an annular protrusion 001 that is the same as the first annular protrusion. A hinged cover is connected to its outer side by a hinge. The free end of the cover is provided with a buckle that can be quickly locked with the groove on the edge of the second annular protrusion.

[0036] Sealing ring 300: Made of fluororubber, it is annular with an inner diameter of 80mm (matching the second port diameter of the first / second cylinder) and a thickness of 8mm; annular positioning grooves 301 are respectively opened on its two axial end faces, with a groove depth of 0.8mm and a width of 0.3mm (matching the filter paper thickness of 0.2mm), and the edge of the filter paper is embedded in the positioning groove to achieve circumferential limiting.

[0037] Fastener 400: It is a split clamp structure, including a first retaining ring 401, a second retaining ring 402, a connecting part, and a locking part.

[0038] The first retaining ring 401 and the second retaining ring 402 are both semi-circular arc-shaped, with an annular groove 403 machined on the inner wall. The groove width is adapted to the total thickness (10mm) of the first / second annular protrusion. A limiting boss is provided at the bottom of the annular groove 403, with a boss height H = 2mm (that is, the design compression of the sealing ring 300 is 2mm, accounting for 25% of the initial thickness).

[0039] Connector: It is a threaded rod (8mm in diameter), with both ends passing through the free end through holes of the first retaining ring 401 and the second retaining ring 402 respectively.

[0040] Locking components include a lock nut 501 and a disc spring washer 502. The lock nut 501 is threaded to the threaded rod and has a radial pin hole at its end for inserting an elastic pin to achieve mechanical anti-loosening. The disc spring washer 502 is sleeved on the threaded rod and located between the lock nut 501 and the retaining ring to provide continuous axial preload.

[0041] The engagement of the annular positioning groove 301 and the annular protrusion 001: The edge of the filter paper is embedded in the positioning groove of the sealing ring 300, and the annular protrusion 001 of the first / second annular convex edge is embedded in the outer gap of the positioning groove, forming a triple positioning structure of "groove-edge-protrusion".

[0042] The engagement of the annular positioning groove 301 and the annular protrusion 001 restricts the radial displacement of the filter paper, ensuring that its center is aligned with the axis of the cylindrical cavity, thus avoiding a reduction in the filtration area due to displacement (experimental data shows that the positioning accuracy can be improved to ±0.1mm); the annular protrusion 001 squeezes the edge of the filter paper, enhancing the tightness of the fit between the filter paper and the sealing ring 300, and reducing airflow bypass (the leakage rate is reduced to below 0.5%).

[0043] The anti-loosening and limiting design of fastener 400 works on the following principle: the disc spring washer 502 generates elastic deformation after the nut is tightened, providing a continuous preload of 200N to compensate for the thread clearance caused by vibration; the anti-loosening nut 501 is mechanically locked to the threaded rod by a pin to prevent the nut from rotating on its own.

[0044] The limiting principle is as follows: when the clamp is tightened, the first / second annular convex edge presses the sealing ring 300 towards the middle until the end face of the convex edge contacts the limiting boss. At this time, the compression of the sealing ring 300 is exactly 2mm (design value).

[0045] Advantages of the anti-loosening and limiting design of fastener 400:

[0046] Improved vibration resistance: In vibration tests at 10-2000Hz, the fastening force attenuation rate is less than 5% (compared to >20% for traditional structures);

[0047] Sealing stability: The compression of the sealing ring 300 is controlled at 25% ± 1% by mechanical limiting, avoiding material fatigue caused by over-compression (extending service life to more than 500 disassembly and assembly cycles).

[0048] The quick-release function of the hinged cap works as follows: the cap rotates around the second annular convex edge via the hinge, and when closed, the buckle engages with the slot, pressing the edge of the filter paper into the positioning groove of the sealing ring 300; when replacing the filter paper, the cap can be opened simply by prying open the buckle, without the need to remove the clamp.

[0049] The advantages of the hinged cap's quick-release function: the time for a single filter paper replacement is reduced from 5 minutes in the traditional structure to 1 minute, the operating efficiency is increased by 80%, and contamination caused by direct hand contact with the filter paper is avoided.

[0050] The assembly process of this technical solution is as follows: Insert the edge of the filter paper into the positioning groove on one side of the sealing ring 300, cover the second connector 200, and align the annular protrusion 001 of the second annular convex edge with the outside of the positioning groove; close the first connector 100, and the annular protrusion 001 of the first annular convex edge is embedded into the positioning groove on the other side of the sealing ring 300, forming a mating body of "first connector 100-sealing ring 300-second connector 200"; fasten the first retaining ring 401 and the second retaining ring 402 of the clamp to the outside of the annular convex edge, insert the threaded rod and pre-tighten the anti-loosening nut 501 until the limiting boss contacts the annular convex edge, and insert the elastic pin to complete the locking; if the filter paper needs to be replaced, simply open the hinged cover of the second connector 200, remove the old filter paper and insert the new filter paper, and close the cover.

[0051] Filtration process: Air flows in from the inlet end of the first connector 100, passes through the first cylinder and enters the sealed cylindrical cavity (volume of about 500mL) formed by the first connector 100, the second connector 200 and the sealing ring 300. The airflow passes through the filter paper axially, and the particulate matter is intercepted. The purified air is discharged from the outlet end through the second cylinder.

[0052] The advantages of this technical solution are:

[0053] High reliability: Through the combined design of "positioning groove + annular protrusion 001 + limiting boss", the filter paper achieves zero offset, controllable sealing compression, and stable filtration efficiency of 99.9% (for 0.3μm particles).

[0054] Strong environmental adaptability: The anti-loosening structure can withstand a temperature range of -40℃ to 120℃ and 2000Hz vibration, making it suitable for complex scenarios such as automotive and industrial applications;

[0055] Ease of use: The quick-release cap design reduces filter paper replacement time by 80% and lowers maintenance costs;

[0056] Long lifespan: Made of stainless steel + 300 fluororubber sealing rings + mechanical limit design, with a service life of up to 10,000 hours (compared to about 3,000 hours for traditional structures).

[0057] This embodiment solves the problems of "inaccurate positioning, sealing failure, and cumbersome operation" in traditional filter paper clamping structures by improving the positioning structure of the first / second connector 200, the anti-loosening and limiting design of the fastener 400, and the innovation of the quick-release cap. It is especially suitable for scenarios such as air filters and industrial exhaust gas monitoring that require frequent filter paper replacement and have high reliability requirements. Its structure is simple, the cost is controllable, and it has significant practical value and market prospects.

[0058] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A filter paper clamping structure for an air filter, characterized in that: include: The first connector (100) has its first end used to connect to the air intake pipe; The second connector (200) has its first end used to connect to the air outlet pipe; A sealing ring (300) is formed by pressing the sealing ring (300) from both axial sides of the first connector (100) and connecting the second end of the second connector (200) to form a sealed cylindrical cavity. Filter paper may be selectively sandwiched between the sealing ring (300) and the second end of the first connector (100) or the second end of the second connector (200). Fastener (400) for applying a tightening force to prevent the first joint (100), the second joint (200) and the sealing ring (300) from separating; The sealing ring (300) has an annular positioning groove (301) on both axial end faces, and the edge of the filter paper is embedded in the annular positioning groove (301); the fastener (400) includes a clamp with an anti-loosening structure, the inner wall of the clamp is provided with an annular groove (403) adapted to the annular protrusion of the first connector (100) and the second connector (200), and the annular groove (403) is provided with a limiting structure for limiting the compression of the sealing ring (300).

2. The filter paper clamping structure of an air filter according to claim 1, characterized in that: The second end of the first connector (100) is provided with a first annular protrusion, and the second end of the second connector (200) is provided with a second annular protrusion. The first annular protrusion and the second annular protrusion are connected and jointly squeeze the sealing ring (300). The mating surfaces of the first annular protrusion and the second annular protrusion are provided with annular protrusions (001) that are adapted to the annular positioning groove (301).

3. The filter paper clamping structure of an air filter according to claim 1, characterized in that: The anti-loosening structure includes an anti-loosening nut (501) and a disc spring washer (502). The open end of the clamp is connected by a threaded rod. The anti-loosening nut (501) is threadedly connected to the threaded rod. The disc spring washer (502) is sleeved on the threaded rod and located between the anti-loosening nut (501) and the open end of the clamp.

4. The filter paper clamping structure of an air filter according to claim 1, characterized in that: The limiting structure includes a limiting boss disposed on the inner wall of the annular groove (403), the height of which is 20% to 30% of the initial thickness of the sealing ring (300) to limit the maximum compression of the sealing ring (300).

5. The filter paper clamping structure of an air filter according to claim 2, characterized in that: The outer diameters of the first annular protrusion, the second annular protrusion, and the sealing ring (300) are the same, and the inner diameter of the annular groove (403) is adapted to the outer diameter of the first annular protrusion to form a circumferentially fully enclosed fastening.

6. The filter paper clamping structure of an air filter according to claim 1, characterized in that: Both the first connector (100) and the second connector (200) are constricted cylindrical structures. The first port diameter of the first connector (100) is smaller than its second port diameter, and the first port diameter of the second connector (200) is smaller than its second port diameter.

7. The filter paper clamping structure of an air filter according to claim 1, characterized in that: The sealing ring (300) is made of fluororubber material, and the depth of the annular positioning groove (301) is 0.5-1mm, and the difference between its width and the thickness of the filter paper does not exceed 0.2mm.

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