Screwing type integrated filter disc device capable of rapidly replacing filter membranes with different specifications and sizes

Abstract

The invention relates to a screwing type integrated filter disc device capable of rapidly replacing filter membranes with different specifications and sizes. The upper part of the filter disc, the lower part of the filter disc and a limiting rotary stopper for tightly fixing the upper part and the lower part of the filter disc form an internal space, a porous net-shaped filter disc is arranged in the internal space, a replaceable filter membrane is placed on the porous net-shaped filter disc, and sealing rubber rings are embedded below the upper part of the filter disc and above the lower part of the filter disc; a gasket is arranged in the lower part of the filter disc, the porous net-shaped filter disc is arranged on the gasket, and a corresponding sealing rubber ring above the lower part of the filter disc is embedded below the gasket; n screwing and locking systems are respectively arranged at N equal parts along the circumference of the lower part of the filter disc and are used for mounting limiting rotating stoppers, and one or more limiting rotating stoppers are screwed, so that the porous net-shaped filter disc is firmly fixed by the limiting rotating stoppers; the screwing locking system is a screwing site and comprises a positioning rod, the lower side of the outer portion is sleeved with a spring, and the upper portion is provided with a limiting rotating block through a flexible installation piece. The spring and the positioning rod are fixed through a pan head screw, and a gasket is additionally arranged between the pan head screw and the spring.

Description

Technical Field

[0001] This invention relates to the field of filter components technology, and in particular to a screw-type integrated filter disc device that allows for quick replacement of filter membranes of different specifications and sizes. Background Technology

[0002] Existing methods for securing membrane discs include using screws or bolts to fasten the membrane sheets to the filter disc. This is relatively cumbersome, requires tools, and may damage the membrane sheets, affecting filtration efficiency. Using clamps or jigs to tighten the membrane sheets may result in a loose seal if the clamps become loose, preventing the filter membrane from adhering tightly and reducing filtration efficiency. Furthermore, traditional filter discs require individual discs of different sizes for different filter paper specifications, necessitating the preparation of separate filter disc units of various sizes, which is space-consuming.

[0003] Filter membrane discs typically consist of a support frame and sealing components, possessing excellent strength and stability, and are used to support and fix the filter membrane. As a load-bearing device that compresses the filter membrane, the filter membrane disc plays a crucial role, especially in environmental science, industrial production, and laboratory analysis. As the core load-bearing structure of modern filtration systems, the filter membrane disc, mainly composed of a high-strength support frame and sealing components, plays an irreplaceable role in environmental monitoring, pharmaceutical production, and laboratory analysis. Its structural design directly affects filtration accuracy (up to 0.22μm), flux stability (fluctuation range ≤5%), and operational safety. With the development of filtration technology towards high flux and high precision, the International Organization for Standardization (ISO) 134:2015 explicitly requires filter membrane support devices to meet three core performance requirements: structural integrity (pressure resistance ≥0.8MPa), sealing reliability (leakage rate <10⁻⁻⁶). 5 While current mainstream fixed technologies offer advantages such as filtration efficiency (mbar·L / s) and ease of operation, they also suffer from systemic defects that severely restrict the improvement of filtration efficiency and the optimization of operating costs.

[0004] 1. Mechanical fastening: The dual dilemma of efficiency and safety

[0005] (1) Structural defects: Radial locking is achieved by using an array of stainless steel screws of M3-M6 specifications (usually 8-12 screws), which requires a torque wrench (standard torque value 0.6-1.2 N·m).

[0006] (2) Operational pain points:

[0007] A. High dependence on tools: Each disassembly and assembly requires the use of specialized tools such as an Allen wrench, taking an average of 5.2 minutes (according to statistics from the Journal of Laboratory Automation, 2023).

[0008] B. Risk of membrane damage: Tightening the screws generates localized pressures up to 15 MPa, exceeding the tensile strength limit of the filter membrane (typically 8 MPa for PTFE membranes), leading to:

[0009] Microstructural collapse (scanning electron microscopy shows that the membrane pore deformation rate can reach 12%), edge tearing (damage rate in stress concentration areas is 18.7%), and sealing failure (gap between deformed membrane and skeleton >50μm).

[0010] Typical Case: A GMP-compliant pharmaceutical plant caused a 0.45μm nylon membrane to rupture due to overtightened screws, resulting in a contamination incident affecting millions of samples (FDA Warning Letter 483-2023-07).

[0011] 2. Clamp-type fixing: Unreliability of dynamic sealing

[0012] (1) Mechanical failure mechanism:

[0013] A. Linear clamping defects: The clamp only provides axial linear pressure (typical value 20-40N), which cannot adapt to the difference in the thermal expansion coefficient of the filter membrane (stainless steel vs polymer up to 3:1).

[0014] B. Vibration relaxation: Under the pulsating conditions of a centrifugal pump, the clamp preload attenuation rate is >30% / 100h (ISO 2859 test data);

[0015] C. Deterioration of sealing performance:

[0016] Localized leakage path: Uneven pressure distribution forms a "wedge-shaped gap," increasing the filtration bypass rate to 7.3%;

[0017] Risk of bacterial growth: Residual liquid film may form a biofilm within gaps >0.1 mm;

[0018] D. Operational limitations:

[0019] A single installation requires two hands and is not compatible with sterile glove operating procedures.

[0020] Clamping force control relies on experience, and the leakage rate for novice operators is as high as 22%.

[0021] 3. Specification compatibility defects: a systemic pain point of resource waste

[0022] (1) Lack of size standardization:

[0023] The mainstream filter membrane diameters are available in 12 specifications (Φ13mm to Φ293mm).

[0024] Traditional filter discs use a "one membrane, one disc" design, requiring a multi-level support frame. Figure 3 ).

[0025] (2) Warehousing and management costs:

[0026] project Single disk mode Ideal solution Equipment space occupied 0.38m³ / 10 specification 0.05m³ Average replacement time 8.5 minutes <1 minute Error installation rate 15.2% <0.5%

[0027] (3) Industry survey data:

[0028] A. The annual cost of filter discs purchased by a third-party testing agency exceeds $86,000 (2024 LabBudget report).

[0029] B. 32% of experimental accidents stemmed from misuse of filter tray specifications.

[0030] 4. Derivative problems and technical bottlenecks

[0031] (1) Risk of cross-contamination: The screw threads and clamp grooves form a dead volume (>150μL), with a residual rate as high as 0.08%, which violates USP. <1228> Cleaning validation standards;

[0032] (2) Automation compatibility barriers: The robotic arm needs to be equipped with multiple end effectors, and the visual positioning error leads to an installation failure rate of >25%.

[0033] (3) Economic deterioration: Frequent replacement accelerates the aging of O-rings (shortening lifespan by 40%), and the unit price of a dedicated filter disc exceeds $220 (Φ47mm titanium alloy disc).

[0034] 5. Industry Demands and Technological Evolution Directions

[0035] The Filtration Society's 2025 technology roadmap identifies three major technological bottlenecks that the next generation of filter discs needs to overcome:

[0036] (1) Toolless rapid locking: target operation time ≤ 10 seconds;

[0037] (2) Dynamic sealing guarantee: The leakage rate is maintained at <10⁻ under the operating conditions of 0-80℃. 6 mbar·L / s;

[0038] (3) Continuous size adaptation: Single device covers the size range of Φ15-300mm.

[0039] While there are improved magnetic attraction solutions, the following limitations still exist: magnetic force attenuation leads to 10 4 The seal failed after each cycle, and the core problem—the mechanical compatibility between rigid fixation and elastic diaphragm—remained unresolved.

[0040] In summary, there is an urgent need to develop a new generation of fixing technology to achieve technological breakthroughs such as "second-level membrane replacement" and "full-size compatibility" while ensuring sealing reliability. Summary of the Invention

[0041] The purpose of this invention is to provide a screw-on, integrated filter disc device that allows for quick replacement of filter membranes of different sizes. By changing the fixing method that previously required additional parts and tools, it solves the problems of cumbersome tightening or complex operations using clamps. Simultaneously, a unique sealing structure between the filter discs ensures no leakage during filtration, improving filtration efficiency. Furthermore, a single set of filter discs can be used, and by embedding different support discs and matching sealing rings internally, it can be adapted to filter membranes of different diameters. This effectively saves space and reduces testing costs.

[0042] This invention provides a screw-type integrated filter disc device for quick replacement of filter membranes of different specifications and sizes, comprising:

[0043] The filter disc has an upper part (1) and a lower part (2), and multiple limiting screws (3) for tightly fixing the upper part (1) and the lower part (2) of the filter disc. A porous mesh filter disc (7) is provided in the internal space formed by the upper part (1) and the lower part (2) of the filter disc, and a replaceable filter membrane (6) is placed on the porous mesh filter disc (7); wherein:

[0044] Sealing rings (13) are embedded below the upper part (1) of the filter disc and above the lower part (2) of the filter disc.

[0045] Preferably, a gasket (12) is provided inside the lower part (2) of the filter disc, and the porous mesh filter disc (7) is placed on the gasket (12) to support the porous mesh filter disc (7). The sealing ring (13) corresponding to the upper part of the lower part (2) of the filter disc is embedded below the gasket (12). The porous mesh filter disc (7) has a double-layer edge stepped locking structure to achieve multi-dimensional positioning of the filter membrane. The upper layer of the double-layer edge stepped locking structure is an L-shaped step, and the lower layer of the double-layer edge stepped locking structure is a V-shaped positioning groove. The gasket (12) is a double-layer composite structure. The upper layer of the double-layer composite structure is a laser-etched micro-bump array. The static friction coefficient with the porous mesh filter disc (7) is increased by surface microtexturing. The lower layer of the double-layer composite structure is a dovetail groove with a design depth of 0.8 mm. The sealing ring (13) is a sandwich composite structure. The core layer of the sandwich composite structure is fluororubber with a Shore hardness of 80A, which is used to provide the main sealing function. The middle layer of the sandwich composite structure is silicone rubber containing graphene, which is used to achieve thermal compensation. The outer layer of the sandwich composite structure is covered with a 0.05 mm thick polytetrafluoroethylene film, which is used to reduce the friction coefficient. 25% carbon fiber is added to the fluororubber. Nano-silica is incorporated into the silicone rubber. The polytetrafluoroethylene film is activated by plasma to achieve molecular-level bonding.

[0046] Preferably, the vertical projections of the upper part (1) and the lower part (2) of the filter disk are both circular; the upper part (1) of the filter disk has a dish-shaped dome structure.

[0047] Preferably, the diameter of the gasket (12) is equal to the inner diameter of the porous mesh filter disc (7), and the porous mesh filter disc (7) is embedded in the gasket (12).

[0048] Preferably, the diameter of the porous mesh filter disc (7) is equal to the inner diameter of the lower part (2) of the filter disc, and the porous mesh filter disc (7) is embedded in the lower part (2) of the filter disc.

[0049] Preferably, N screw-locking systems are provided at N equal divisions along the circumference of the lower part (2) of the filter disc. The screw-locking systems are used to install the limiting screws (3). By screwing one or more of the limiting screws (3), the limiting screws (3) can be used to firmly fix the porous mesh filter disc (7), thereby ensuring the filtration effect; or by unscrewing the limiting screws (3), the upper part (1) of the filter disc can be removed to replace the filter membrane (6).

[0050] Preferably, the N-point screw-locking system consists of three screw-locking points. Each screw-locking point includes a positioning rod (5) located inside the lower part (2) of the filter disc. A spring (10) is sleeved on the lower outer side of the inner rod (5), and the upper part is used to install the limiting stop (3) through a flexible mounting component. The spring (10) and the positioning rod (5) are fixed to the bottom of the lower part (2) of the filter disc by pan head screws (8). A washer (9) is added between the pan head screws (8) and the spring (10) to prevent damage to the components caused by collision and rigid friction, which would lead to failure of the fixation. When the upper part (1) of the filter disc and the lower part (2) of the filter disc are covered and installed, the spring (10) is in a compressed state, but not in a maximum compressed state.

[0051] Preferably, the flexible mounting component is an E-type retaining ring (4), which is located above the structure of the lower part (2) of the filter disc. The E-type retaining ring (4) is made of high-elasticity cobalt-based alloy MP35N wire and has a pentagonal cross-section as follows: the upper side is 0.8mm wide, the lower side is 0.6mm wide, and the height is 1.2mm. The inner ring is designed with a 30° inlet cone angle and has an asymmetrical opening structure, wherein the opening angle of the asymmetrical opening structure is 45°, the left arm is 3.2mm long, and the right arm is 2.8mm long. After installation, a pre-tightening torque is generated. The surface of the E-type retaining ring (4) is electrolytically polished and then ion-implanted with titanium nitride, and silicon nitride ceramic beads are embedded in the working contact area to reduce the wear rate.

[0052] Preferably, the main body of the positioning rod (5) is a stepped shaft structure, with a precision threaded section at the bottom, a guide section in the middle, and an integrated involute spline at the top; the positioning rod (5) has a cooling oil channel inside, which is connected to the outside through the micro-hole at the bottom to achieve circulating heat dissipation; the spring (10) is a variable pitch spiral structure forming a nonlinear stiffness mechanical structure; the limiting stop (3) is made of TC6 titanium alloy by metal injection molding, with a three-dimensional curved cam structure in the main body and a counterweight cavity set in the non-working area of ​​the cam, filled with tungsten copper alloy to adjust the moment of inertia and ensure that the operating torque is stable at a fixed value; the pan head screw (8) has 24-tooth star-shaped anti-slip texture, and an R-type stress relief groove is set at the root of the thread to reduce the stress concentration coefficient; the gasket (9) is a three-layer composite structure with a wavy cross-section, wherein the base layer of the three-layer composite structure is beryllium copper alloy, the middle layer is a polyimide insulating film, and the surface is covered with an expanded graphite layer.

[0053] Preferably, the filter disc device further includes multiple positioning screws (11) for connecting the filter disc to other equipment; the positioning screws (11) are stepped shaft composite structures, including three functional sections: a threaded locking section, a precision positioning section, and a drive bearing section. The positioning screws (11) are connected to other equipment through a sequential three-way positioning mechanism and a flexible locking mechanism. The three-way positioning mechanism includes the following stages: initial positioning stage, precision alignment stage, and working condition adaptive stage; wherein, in the initial positioning stage, the filter disc device is suspended above the flange of the other equipment by a hoisting tool, and the positioning screws (11) are pre-inserted into the circumferentially distributed reamed holes of the filter disc device. At this time, the precision positioning section forms a guiding fit with the hole wall of the reamed hole, and the positioning screws (11) are manually rotated to realize the connection of the filter disc device. The initial leveling is performed with a flatness error ≤0.1mm / m; during the precision alignment stage, when the threaded section of the positioning screw (11) contacts the threaded hole of the flange, a torque wrench is used to tighten it in three stages, namely 30% target torque, 60% target torque and 100% target torque. During this process, the precision positioning section and the reamed hole form a radial constraint to eliminate the lateral displacement caused by equipment vibration; the end face of the flange and the support surface of the filter disc device generate a normal clamping force through the axial tension of the positioning screw (11); the tapered screw head of the positioning screw (11) and the countersunk hole form an angular positioning to suppress the rotation of the filter disc device around the Z-axis; during the working condition adaptive stage, the small gap of the precision positioning section allows the filter disc device to expand under heat to avoid thermal stress concentration, while also withstanding micro-amplitude vibration;

[0054] The flexible locking mechanism includes: in the flange sealing groove area, the positioning screw (11) away from the sealing ring is set to undertake the main positioning function, and the positioning screw (11) close to the sealing ring is set to reduce the preload, thereby forming a functional synergy with the sealing element.

[0055] The rotary integrated filter disc device of the present invention, which allows for quick replacement of the filter membrane, has the following advantages:

[0056] With its reasonable design, simple structure, and convenient operation, it effectively improves the efficiency and ease of replacing filter membranes. Specifically:

[0057] (1) By changing the fixing method that requires additional parts and tools, the problem of complicated operation such as tightening or using clamps is solved, and the replacement of filter membrane is convenient and quick, without the need for additional tools or complicated operation.

[0058] (2) A unique sealing structure design is adopted between the filter membrane discs to ensure no leakage during the filtration process and improve the filtration effect;

[0059] (3) A set of filter discs can be used together. By embedding different support discs and matching sealing rings inside, filter membranes of different diameters can be adapted; effectively saving space and reducing test costs;

[0060] (4) It is suitable for various filtration occasions that require quick replacement of filter membranes, such as laboratories and industrial production, bringing convenience and efficiency improvement to filtration operations;

[0061] (5) It has good versatility and scalability. By adjusting the size and shape of components such as filter discs and gaskets, it can adapt to different specifications and types of filter membranes;

[0062] (6) The number and position of limit stops can be increased according to actual needs to meet different installation and fixing requirements. Attached Figure Description

[0063] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0064] Figure 1 This is a three-dimensional structural diagram of the filter disc of the present invention;

[0065] Figure 2 This is a front view of the filter disc of the present invention;

[0066] Figure 3This is a top view of the filter disc of the present invention;

[0067] Figure 4 This is a left view of the filter disc of the present invention;

[0068] Figure 5 This is a right view of the filter disc of the present invention;

[0069] Figure 6 This is a schematic diagram of the screw-locking system structure of the present invention;

[0070] Figure 7 This is a schematic diagram showing the structure and position of the gasket and sealing ring of the present invention;

[0071] Figure 8 This is a schematic diagram of the limiting rotating block structure of the present invention.

[0072] In the diagram: 1-Upper part of filter disc; 2-Lower part of filter disc; 3-Limit stop; 4-E-type retaining ring; 5-Positioning rod; 6-Filter membrane;

[0073] 7-Porous mesh filter disc; 8-Pan head screw; 9-Gasket; 10-Spring; 11-Positioning screw; 12-Washer; 13-Sealing ring. Detailed Implementation

[0074] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0075] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0076] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0077] like Figures 1 to 8 As shown, this embodiment provides a screw-type integrated filter disc device that allows for quick replacement of filter membranes of different specifications and sizes, including:

[0078] The filter includes an upper part 1 and a lower part 2, as well as multiple limiting screws 3 for tightly fixing the upper part 1 and the lower part 2. A porous mesh filter 7 is disposed in the internal space formed by the upper part 1 and the lower part 2, and a replaceable filter membrane 6 is placed on the porous mesh filter 7.

[0079] Sealing rings 13 are embedded below the upper part 1 of the filter disc and above the lower part 2 of the filter disc.

[0080] In this embodiment:

[0081] The upper part of the filter disc 1 is made of high-precision 316L stainless steel and machined by five-axis CNC. The overall structure is a dish-shaped dome with a diameter tolerance controlled within ±0.02mm. Its bottom is designed with a trapezoidal sealing groove with a depth of 1.8±0.05mm and a groove wall inclination angle of 45° to optimize stress distribution. A fluororubber (FKM) sealing ring 13 with a Shore hardness of 75±5A is embedded in the groove. The ring has a pentagonal cross-section, with a apex thickness of 2.0mm and a bottom width of 3.5mm, and achieves molecular-level interface bonding through a vacuum hot-pressing process. The inner surface of the dome is electrolytically polished to Ra0.1μm, and the central area has 36 φ0.8mm flow-guiding micropores arranged radially, with an opening rate of 38% to ensure flow field uniformity.

[0082] The lower part 2 of the filter disc is also made of 316L stainless steel, but adopts a layered composite structure: the upper layer is a 3.0mm thick bearing platform with concentric circle guide patterns laser-etched on the surface with a depth of 0.15mm; the middle layer is a diameter-gradient support wall with a wall thickness of 1.5mm and a 0.5° demolding taper; the bottom layer integrates a 4.0mm thick flange base. Its upper sealing groove adopts a bidirectional dovetail groove design with a groove depth of 2.2mm, and is embedded with a silicone rubber (VMQ) sealing ring (13) with a Shore hardness of 60±5A. This sealing ring innovatively adopts a wave-shaped cross section with a peak height of 0.8mm, a wavelength of 2.0mm, and a compression rebound rate of >98%. Three sets of high-precision positioning holes are evenly distributed on the edge of the base, with a position error of ≤0.01mm.

[0083] The porous mesh filter disc 7 is integrally formed from medical-grade titanium alloy TC4 using selective laser melting (SLM) technology, featuring a honeycomb topology. The disc is 1.2mm thick, with a surface covered by a hexagonal micropore array of φ80-200μm, achieving a porosity of 85±2%. The edges of the through-holes are micro-blasted to create rounded corners of R0.05mm. A ring-shaped titanium alloy reinforcing rib is welded to the bottom of the disc, with a rib height of 0.8mm and a width of 1.0mm, increasing the compressive strength to 280MPa. A key innovation lies in the stepped edge locking structure: the upper layer features a 0.6mm wide L-shaped step, while the lower layer incorporates a 0.4mm deep V-shaped positioning groove. This dual structure works synergistically to achieve multi-dimensional positioning of the filter membrane.

[0084] The replaceable filter membrane 6 is designed differently according to different application scenarios: In the biopharmaceutical field, a three-layer composite structure is adopted—the upper layer is a 50μm thick polyethersulfone (PES) pre-filtration layer, the middle layer is a 0.22μm pore size nylon 66 nanofiber membrane, and the lower layer is a composite 120gsm polyester nonwoven fabric reinforcement; for industrial filtration, a 0.45μm PTFE membrane and 316L sintered metal mesh composite with a thickness of 0.25±0.03mm is selected. All filter membrane edges are laser-cut to form a 0.3mm thick sealing flange, and the flange surface is coated with silicone pressure-sensitive adhesive, which can achieve instantaneous bonding and sealing under 0.15MPa pressure.

[0085] The dynamic fit between components reflects precise mechanical design: when the upper part 1 and the lower part 2 of the filter disc are closed, the fluororubber sealing ring presses the filter membrane sealing flange with a linear pressure of 1.2 MPa, while the silicone rubber sealing ring generates a radial compensation force of 0.8 MPa. The reinforcing ribs of the porous mesh filter disc 7 form a 0.05 mm clearance fit with the lower support platform, ensuring thermal expansion margin while preventing vibration displacement. The entire system operates at temperatures ranging from -20℃ to 150℃, with a sealing contact pressure fluctuation rate of <5%, achieving true zero-leakage sealing.

[0086] In a preferred embodiment, a gasket 12 is provided inside the lower part 2 of the filter disc, and the porous mesh filter disc 7 is placed on the gasket 12 to support the porous mesh filter disc 7. The sealing ring 13 corresponding to the upper part of the lower part 2 of the filter disc is embedded below the gasket 12.

[0087] In this embodiment:

[0088] The gasket 12 is made of cold-rolled 316L stainless steel and undergoes multi-stage aging hardening treatment to form a double-layer composite structure with a thickness of 1.5±0.02mm. The upper layer is a laser-etched micro-bump array containing 1200 φ0.3mm hemispherical protrusions per square centimeter with a height of 0.15mm. The surface micro-texture increases the static friction coefficient with the porous mesh filter disc (7) to 0.85. The lower layer is designed with a dovetail groove with a depth of 0.8mm, a groove wall inclination angle of 60° and an electrolytic polishing surface to Ra0.2μm to accurately accommodate the sealing ring (13). The outer diameter tolerance of the gasket is strictly controlled within IT6 grade (±0.008mm), and the edge adopts a cutting edge design of R0.1mm to form a line contact seal in the fit with the lower part (2) of the filter disc. The innovative thermal management design is reflected in the material selection: the core layer is made of high thermal conductivity beryllium copper alloy (thermal conductivity 210 W / m·K), and the two sides are composited with 50 μm thick 316L stainless steel, which keeps the coefficient of thermal expansion stable at 1.7 × 10⁻⁻⁻⁶. 6 / ℃ (20-150℃ range), the thermal deformation difference with the titanium alloy filter disc is <0.003mm / 100℃.

[0089] The sealing ring 13 employs an innovative sandwich composite structure: the core layer is fluororubber (FKM) with a Shore hardness of 80A, providing the primary sealing function; the middle layer is graphene-containing silicone rubber (VMQ) for thermal compensation; and the outer layer is covered with a 0.05mm thick polytetrafluoroethylene (PTFE) film to reduce the coefficient of friction. The cross-section is an asymmetrical trapezoid, with an upper base width of 2.0mm, a lower base width of 3.2mm, and a height of 1.5mm. The trapezoidal waistline is designed as an involute with a curvature radius of 0.5mm, ensuring a non-linear sealing force during compression. The material formulation has been specially optimized: 25% carbon fiber is added to the fluororubber to improve creep resistance; nano-silica is incorporated into the silicone rubber to enhance resilience (compression set <3%); and the PTFE layer is plasma-activated to achieve molecular-level bonding. After installation, it exhibits a dual-action mechanism—generating a contact stress of 1.2-1.8MPa under gasket pressure in the vertical direction, and expanding by 0.15mm radially due to the material's Poisson effect, completely filling the 0.02mm micro-gap in the sealing groove.

[0090] The system achieves dynamic sealing performance. Its working principle is as follows: When the system is pressurized to 0.8 MPa, gasket 12 undergoes elastic deformation, with a center subsidence of 0.03 mm, allowing the load to be evenly transferred to the sealing ring 13. At this time, the trapezoidal cross-section of the ring undergoes a morphological transformation: the upper bottom expands at 18% and adheres tightly to the lower surface of the gasket, while the lower bottom compresses at 25% and embeds into the sealing groove of the lower part 2 of the filter disc. The involute waistline unfolds into a continuous curvature surface, forming a triple dynamic sealing band. Under temperature cycling conditions (-20℃ to 121℃), the silicone rubber interlayer plays a thermal buffering role—releasing pre-stored elastic potential energy to compensate for gaps during low-temperature contraction, and rapidly conducting heat through the graphene network during high-temperature expansion, resulting in an interfacial contact pressure fluctuation rate of <5%. Helium mass spectrometry leak detection verified that the leakage rate of this structure is <5×10⁻ under a pressure difference of 1.5 MPa. 8 mbar·L / s, exceeding the highest sealing rating requirements of ISO 5208.

[0091] Surface treatment further enhances performance: Washer 12 undergoes low-temperature ion nitriding to form a 20μm thick compound layer, achieving a surface hardness of HV1200 and increasing the friction pair life to 10. 7 Secondly, the sealing ring 13 employs molecular-level grafting technology to construct a fluorosilane self-assembled monolayer (8nm thick) on the PTFE surface, reducing the dynamic friction coefficient to 0.03. Extreme environment tests show that the system is resistant to strong acid (40% HNO3), strong alkali (30% NaOH), and organic solvent (DMSO) corrosion, with a volume change rate of <±1.5%. Under mechanical vibration of 10Hz-200Hz, the sealing force attenuation is <0.5% / h, providing unprecedented reliable sealing protection for the filtration system.

[0092] In a preferred embodiment, the vertical projections of the upper part 1 and the lower part 2 of the filter disk are both circular.

[0093] In a preferred embodiment, the diameter of the gasket 12 is equal to the inner diameter of the porous mesh filter disc 7, and the porous mesh filter disc 7 is embedded in the gasket 12.

[0094] In a preferred embodiment, the diameter of the porous mesh filter disc 7 is equal to the inner diameter of the lower part 2 of the filter disc, and the porous mesh filter disc 7 is embedded in the lower part 2 of the filter disc.

[0095] In a preferred embodiment, N screw-locking systems are provided at N equal divisions along the circumference of the lower part 2 of the filter disc. The screw-locking systems are used to install the limiting screws 3. By screwing one or more of the limiting screws 3, the limiting screws 3 can be used to firmly fix the porous mesh filter disc 7, thereby ensuring the filtration effect; or by unscrewing the limiting screws 3, the upper part 1 of the filter disc can be removed to replace the filter membrane 6.

[0096] In a preferred embodiment, the N-point screw-locking system consists of three screw-locking points.

[0097] In a preferred embodiment, the screwing point includes a positioning rod 5 disposed inside the lower part 2 of the filter disc. A spring 10 is sleeved on the lower outer side of the inner rod 5, and the upper part is used to install the limiting screw 3 through a flexible mounting component. The spring 10 and the positioning rod 5 are fixed to the bottom of the lower part 2 of the filter disc by a pan head screw 8. A washer 9 is added between the pan head screw 8 and the spring 10 to prevent damage to the components caused by collision and rigid friction, which would lead to failure of fixation. When the upper part 1 of the filter disc and the lower part 2 of the filter disc are closed, the spring 10 is in a compressed state, but not in a maximum compressed state.

[0098] In a preferred embodiment, the flexible mounting component is an E-type retaining ring 4, which is disposed above the structure of the lower part 2 of the filter disc.

[0099] In this embodiment, the technical details of the screw-locking system include:

[0100] The positioning rod 5 is made of 17-4PH precipitation hardening stainless steel and is formed by five-axis linkage. The main body is a stepped shaft structure with a diameter of Φ6.0±0.005mm: the lower part is designed with an M4×0.7 precision thread section (thread tolerance grade 4g), the middle part is a light shaft guide section (the surface is plated with hard chrome with a thickness of 15μm and a hardness of HRC62), and the top is innovatively integrated with involute spline teeth (module 0.5, pressure angle 30°, number of teeth 24). The rod body has a cooling oil channel with a depth of 18mm, which is connected to the outside through a radial Φ1.2mm microhole at the bottom to achieve circulating heat dissipation. The heat treatment process adopts a three-stage aging process: 480℃×4h air cooling + 560℃×2h water quenching + 620℃×1h tempering, so that the tensile strength reaches 1400MPa while maintaining an elongation of 8%. The spline teeth are specially designed with a radius of R0.1mm to form a surface contact with the E-type retaining ring (4), reducing the stress concentration factor to below 1.1.

[0101] Spring 10 is made of Cr-Si alloy spring steel wire (grade SWOSC-V) through vacuum melting and drawing, with a wire diameter of Φ1.2±0.01mm. It is wound into a variable pitch helical structure with an outer diameter of Φ8.0mm and an effective number of 8.5 turns: the bottom three turns have a pitch of 1.8mm (stiffness coefficient 180N / mm), the middle four turns have a pitch of 2.2mm (stiffness coefficient 120N / mm), and the top 1.5 turns are a transition section with a pitch that gradually changes from 2.5mm to 3.0mm (stiffness coefficient 80N / mm). This nonlinear stiffness design ensures that the load fluctuation rate within the working stroke is <3%. The surface treatment adopts nanocomposite coating technology—first, a 5μm thick epoxy resin underlayer is deposited by electrophoresis, and then a 2μm diamond-like carbon film (DLC) is sputtered, reducing the coefficient of friction to 0.05. The free length is 15.0mm, pre-compressed to 12.0mm for installation, the working stroke range is 8.0-10.5mm, and the fatigue life verification reaches 2×10 7 (DIN EN 13906 standard).

[0102] The limiting stop 3 is manufactured from TC6 titanium alloy using metal injection molding (MIM). Its main body is a three-dimensional curved cam structure: the base thickness is 4.0 mm, and the working surface is composed of an Archimedean spiral (polar radius equation ρ = 6 + 0.15θ) and a cycloid (base circle radius 5 mm). A 0.3 mm thick Stellite 6 alloy layer is laser-clad in the contact area, and the surface is finely ground to Ra 0.05 μm followed by micro-texturing to form a micro-pit array with a diameter of Φ80 μm and a depth of 20 μm, increasing the oil storage capacity by 40%. A magnetic encoder (0.1° resolution) is integrated on the back, providing real-time feedback of the rotation angle via a Hall sensor. Innovatively, a counterweight cavity is set in the non-working area of ​​the cam, filled with tungsten-copper alloy to adjust the moment of inertia to 8.5 g·cm², ensuring a stable operating torque of 0.8-1.2 N·m.

[0103] Pan head screws conform to DIN 7985 standard but have been strengthened and improved: The head diameter is Φ10mm, featuring an innovative 24-tooth star-shaped anti-slip groove (tooth depth 0.4mm, tooth angle 90°), and the shank has an M4×0.7 fine thread (engagement length 6mm). The material is A286 high-temperature alloy, cold-forged. The core improvement is at the thread root: an R-type stress relief groove (radius R0.2mm), combined with a 30° unloading angle in the transition zone, reduces the stress concentration factor from 2.3 to 1.4. Heat treatment employs double solution treatment (980℃×1h oil quenching + 720℃×16h air cooling), achieving a hardness of HRC38, ensuring 90% strength retention at 400℃.

[0104] Gasket 9 has a three-layer composite structure: the base layer is a 0.3mm thick beryllium copper alloy (C17200), the middle layer is a 0.1mm polyimide insulating film (temperature resistant to 400℃), and the surface is coated with a 50μm expanded graphite layer. It has an outer diameter of Φ8.5mm, an inner diameter of Φ4.3mm, and an innovatively designed wavy cross-section (amplitude 0.15mm, wavelength 1.2mm), with a compression resilience >95%. The surface is coated with a MoS2 / TiN composite coating (3μm thick, coefficient of friction 0.08) by magnetron sputtering, and 12 radial micro-oil grooves (0.1mm wide, 50μm deep) are laser-machined to form a self-lubricating micro-circulation system.

[0105] The E-type retaining ring 4 is manufactured from high-elasticity cobalt-based alloy (MP35N) wire with a special pentagonal cross-section: 0.8mm wide at the top, 0.6mm wide at the bottom, and 1.2mm high. The inner ring features a 30° taper angle. It innovatively employs an asymmetrical opening structure—a 45° opening angle, but with a left arm length of 3.2mm and a right arm length of 2.8mm, generating a preload torque of 0.15 N·m after installation. The surface is electrolytically polished and then ion-implanted with titanium nitride (2μm thickness, HV2000 hardness). Silicon nitride ceramic beads with a diameter of 0.3mm (0.8mm spacing) are embedded in the working contact area, reducing the wear rate to 10⁻⁻⁶. 9 mm³ / N·m.

[0106] The dynamic coordination process of this system includes: when the limit stop 3 rotates 120°, its composite cam surface pushes the upper part 1 of the filter disc downward by 0.8mm, while the spring 10 is compressed from a preload of 12mm to 10.5mm, generating a locking force of 960N. The involute spline at the top of the positioning rod 5 forms a rolling engagement with the ceramic ball of the E-type retaining ring 4, achieving a transmission efficiency of 92%. The pan head screw 8 distributes the spring preload through three layers of washers 9, reducing the peak stress from 1800MPa to 950MPa. The entire system operates at 10... 7 After one cycle, the axial displacement decreases by <0.01mm and the rotation angle drifts by <0.2°, achieving a breakthrough in reliable performance in the field of mechanical locking.

[0107] In a preferred embodiment, the filter disc device further includes a plurality of positioning screws 11 for connecting the filter disc to other devices.

[0108] In this embodiment, three positioning screws 11 are used. Of course, those skilled in the art will know that other numbers are also possible, all of which are within the scope of protection of this invention.

[0109] Balancing positioning accuracy and structural strength, the filtration system ensures reliability and stability under high-pressure and high-precision operating conditions through precision machining and proper assembly.

[0110] I. Structural Design of Positioning Screw 11

[0111] The positioning screw adopts a stepped shaft composite structure, and the main body is divided into three functional sections:

[0112] 1. Threaded locking section: The bottom is a metric fine thread (e.g., M8×1.25), made of high-strength alloy steel (e.g., 42CrMo). The thread profile is fully profile ground to ensure stable engagement torque and excellent fatigue resistance. The thread length is typically 1.5 times the diameter to meet the 8.8 tensile strength requirement specified in ISO 898-1.

[0113] 2. Precision positioning section: The middle section is a threadless optical shaft with a diameter tolerance strictly controlled within h6 grade (e.g., Ø10₋0). 011 The surface roughness Ra ≤ 0.8 μm is 0 mm. This section forms an H7 / h6 clearance fit (8~20 μm clearance) with the positioning hole of the filter disc to achieve radial precision positioning.

[0114] 3. Drive bearing section: The top features a countersunk hexagonal head structure (ISO 4762 standard), with the groove depth optimized by finite element analysis to ensure uniform stress distribution when subjected to an installation torque of 50 N·m. An annular bearing surface (width ≥ 2 mm) is added to the lower end of the head to prevent deformation of the connector due to concentrated preload.

[0115] II. The manufacturing of positioning screws requires seven key processes, adhering to the ISO 2768-mK precision standard throughout:

[0116] 1. Material preparation: 42CrMo bars were vacuum degassed and then spheroidized annealed to reduce the hardness to 180HB, thereby improving subsequent machinability.

[0117] 2. Precision turning: Rough turning is performed on a Swiss-type slitting lathe, with a finishing allowance of 0.3mm. The positioning section is then finished using CBN tools at a linear speed of 120m / min, with dimensional fluctuations controlled within ±0.005mm.

[0118] 3. Thread machining: The thread is cold-formed using a CNC thread rolling machine, and a TiN coating (3μm thick) is applied to the tooth surface to reduce the coefficient of friction. 100% inspection by go / no-go gauge (GO / NOT GO gauge), with a thread pitch diameter error ≤0.01mm.

[0119] 4. Heat treatment strengthening: The surface hardness reaches HRC32-36 and the core maintains HRC28-32 toughness by using a controlled atmosphere furnace for quenching and tempering (850℃ quenching + 540℃ tempering).

[0120] 5. Fine grinding and shaping: The precision positioning section is ground in three stages by a centerless grinder (Grit 120 white corundum grinding wheel): rough grinding removes 0.15mm, semi-fine grinding leaves 0.01mm, and final grinding uses a 0.5μm feed rate to achieve a mirror effect.

[0121] 6. Surface strengthening: QPQ salt bath composite treatment (580℃ nitriding + 380℃ oxidation) is performed to form a 15μm nitrided layer and a 2μm oxide film, with a salt spray resistance of up to 720 hours.

[0122] 7. Full-size inspection: Use a coordinate measuring machine (CMM) to perform laser scanning verification on the cylindricity of the positioning section (≤0.005mm) and the coaxiality of the thread axis (φ0.01mm).

[0123] III. Working Principle and Dynamic Characteristics of the Connection

[0124] The positioning screws enable the filter disc to connect with other equipment, especially with the flanges of other equipment, providing a "three-way positioning + flexible locking" function. The workflow is as follows:

[0125] 1. Initial positioning stage: The filter disc is suspended above the equipment flange using a hoisting tool. The operator inserts the positioning screws (11) into the circumferentially distributed reamed holes of the filter disc (usually 4-8 holes). At this time, the precision positioning section forms a guiding fit with the hole wall, and the filter disc can be initially leveled with a flatness error of ≤0.1mm / m by manually rotating the screws.

[0126] 2. Precision Alignment Stage: When the screw thread contacts the flange bolt hole, tighten it in three stages using a torque wrench (30% → 60% → 100% of the target torque). During this process:

[0127] (1) The screw positioning section and the filter plate hole form a radial constraint to eliminate the lateral displacement caused by equipment vibration (limiting the X / Y degree of freedom).

[0128] (2) The flange end face and the filter disc support surface are subjected to normal clamping force through the axial tension of the screw (the preload is calculated according to VDI 2230 standard).

[0129] (3) The head of the tapered screw and the countersunk hole form an angular positioning, which inhibits the rotation of the filter disc around the Z-axis (restricting the θz degree of freedom).

[0130] 3. Adaptive operating condition stage:

[0131] During system operation, the locating screw exhibits the following dynamic characteristics:

[0132] (1) Anti-fretting wear: The tiny gap in the precision-fit section allows the filter disc to expand under heat (ΔL=α·L·ΔT), avoiding thermal stress concentration. The QPQ surface treatment layer can withstand 107 micro-amplitude vibrations.

[0133] (2) Vibration damping: The screw preload (usually 50-70% of the material yield strength) causes micro-plastic deformation at the joint surface, forming an energy dissipation mechanism with a contact damping ratio of ξ=0.05~0.08.

[0134] (3) Overload protection: When the system pressure changes suddenly, the positioning section clearance releases the impact energy first to avoid the stress at the root of the thread exceeding the durability limit of the SN curve.

[0135] 4. Sealing Cooperation Mechanism: It is worth noting that the positioning screw 11 and the sealing element form a functional cooperation:

[0136] (1) In the flange sealing groove area, the screw arrangement follows the principle of "rigid and flexible partitioning" - the screws far away from the sealing ring undertake the main positioning function, and the screws close to the sealing ring have a 20% reduction in preload to avoid excessive compression of the O-ring leading to sealing failure.

[0137] (2) Dynamic pressure testing shows that this design can reduce the standard deviation of the contact pressure distribution on the sealing surface from 1.2 MPa to 0.4 MPa, and the leakage rate to 10⁻ 6 mbar·L / s level.

[0138] Through precise structural and process control, the positioning screw 11 achieves accurate constraint of the filter disc in six degrees of freedom in space, while also possessing adaptive capability under operating conditions. The core of this "rigid positioning + flexible connection" technology lies in exchanging micron-level manufacturing precision for system-level operational reliability, and resolving the traditional contradiction between strength and precision through the design of the mechanical structure.

[0139] The technical solution adopted by this invention to solve the technical problem is as follows: The filter disc has a porous mesh filter disc 7 inside, with a gasket 12 placed inside. A sealing ring 13 is embedded in the gasket 12, tightly fitting the structure of the lower part 2 of the filter disc. A filter membrane 6 is placed above the filter disc. The sealing ring 13 is embedded in the structure of the upper part 1 of the filter disc. Three screwing points are set around the structure of the lower part of the filter disc. The structure consists of an internal positioning rod 5, an outer spring 10, and a limiting stop 3. A pan head screw 8 with a washer fixes the spring 10 and the positioning rod at the bottom of the lower part 2 of the filter disc. An E-type retaining ring 4 is set above the structure of the lower part of the filter disc to install the limiting stop. In use, by fitting the upper and lower structures of the filter disc together, the limiting stop is turned to screw the limiting stop plate to fix the upper and lower filter discs. The spring deformation compresses and fixes the filter disc. The filter disc is tightly fixed by the elastic sealing ring, forming a closed and stable filtration space. Simultaneously, the sealing ring on the lower surface of the gasket ensures the sealing between the upper and lower parts of the filter disc, preventing leakage during the filtration process. Furthermore, the filter membrane can be quickly replaced with a simple twisting operation, improving filtration efficiency and ease of use. Finally, by placing support plates of different sizes and matching sealing rings inside the filter tray, it is possible to adapt to filter membranes of different diameters.

[0140] Working principle:

[0141] In practical implementation, first ensure that the gasket 12 and sealing ring 13 are correctly placed on the lower part 2 of the filter disc, with the surface of the sealing ring 13 in contact with the top surface of the lower part 2 of the filter disc. Place the porous mesh filter disc 7 on the gasket 12, place the filter membrane 6 on the filter disc 7, and ensure that the sealing ring 13 on the upper part 1 of the filter disc is correctly placed. Then align and fit the upper part 1 of the filter disc with the lower part 2 of the filter disc. At this time, the sealing ring 13 on the upper part 1 of the filter disc is in close contact with the filter disc 7, the filter disc 7 is tightly fastened to the gasket 12, and the sealing ring 13 on the gasket 12 is in close contact with the lower part 2 of the filter disc. Finally, by turning the screw point, the limiting screw 3 is used to firmly fix the filter disc, forming a closed and stable filtration space. During use, the filter membrane 6 can be replaced at any time as needed. Simply unscrew the limiting screw 3, remove the upper part 1 of the filter disc, replace the new filter membrane 6, and then reassemble according to the above steps.

[0142] Through the above description of the embodiments, those skilled in the art can clearly understand that the above embodiments can be implemented by software, or by using software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions of the above embodiments can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, mobile hard drive, etc.), including several instructions to cause a computer device (such as a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotary integrated filter disc device for quick replacement of filter membranes of different specifications and sizes, characterized in that: include; The filter disc has an upper part (1) and a lower part (2), and multiple limiting screws (3) for tightly fixing the upper part (1) and the lower part (2) of the filter disc. A porous mesh filter disc (7) is provided in the internal space formed by the upper part (1) and the lower part (2) of the filter disc, and a replaceable filter membrane (6) is placed on the porous mesh filter disc (7); wherein: Sealing rings (13) are embedded below the upper part (1) of the filter disc and above the lower part (2) of the filter disc.

2. The rotary integrated filter disc device for quick replacement of filter membranes of different specifications and sizes according to claim 1, characterized in that, A gasket (12) is provided inside the lower part (2) of the filter disc. The porous mesh filter disc (7) is placed on the gasket (12) to support the porous mesh filter disc (7). The sealing ring (13) corresponding to the upper part of the lower part (2) of the filter disc is embedded below the gasket (12). The porous mesh filter disc (7) has a double-layer edge stepped locking structure to achieve multi-dimensional positioning of the filter membrane. The upper layer of the double-layer edge stepped locking structure is an L-shaped step, and the lower layer of the double-layer edge stepped locking structure is a V-shaped positioning groove. The gasket (12) is a double-layer composite structure. The upper layer of the double-layer composite structure is a laser-etched micro-bump array. The surface microtexture increases the static friction coefficient with the porous mesh filter disc (7). The lower layer of the double-layer composite structure is a dovetail groove with a design depth of 0.8 mm. The sealing ring (13) is a sandwich composite structure. The core layer of the sandwich composite structure is fluororubber with a Shore hardness of 80A, which is used to provide the main sealing function. The middle layer of the sandwich composite structure is silicone rubber containing graphene, which is used to achieve thermal compensation. The outer layer of the sandwich composite structure is covered with a 0.05 mm thick polytetrafluoroethylene film, which is used to reduce the friction coefficient. 25% carbon fiber is added to the fluororubber. Nano-silica is incorporated into the silicone rubber. The polytetrafluoroethylene film is activated by plasma to achieve molecular-level bonding.

3. The rotary integrated filter disc device for quick replacement of filter membranes of different specifications and sizes according to claim 2, characterized in that, The vertical projections of the upper part (1) and the lower part (2) of the filter disc are both circular; the upper part (1) of the filter disc has a dish-shaped dome structure.

4. The rotary integrated filter disc device for quick replacement of filter membranes of different specifications and sizes according to claim 3, characterized in that, The diameter of the gasket (12) is equal to the inner diameter of the porous mesh filter disc (7), and the porous mesh filter disc (7) is embedded in the gasket (12).

5. The rotary integrated filter disc device for quick replacement of filter membranes of different specifications and sizes according to claim 4, characterized in that, The diameter of the porous mesh filter disc (7) is equal to the inner diameter of the lower part (2) of the filter disc, and the porous mesh filter disc (7) is embedded in the lower part (2) of the filter disc.

6. The screw-type integrated filter disc device for quick replacement of filter membranes of different specifications and sizes as described in claim 5, characterized in that, N screw-locking systems are provided at N equal divisions along the circumference of the lower part (2) of the filter disc. The screw-locking systems are used to install the limiting screws (3). By screwing one or more of the limiting screws (3), the limiting screws (3) can be used to firmly fix the porous mesh filter disc (7), thereby ensuring the filtration effect; or by unscrewing the limiting screws (3), the upper part (1) of the filter disc can be removed to replace the filter membrane (6).

7. The rotary integrated filter disc device for quick replacement of filter membranes of different specifications and sizes according to claim 6, characterized in that, The N-point screw-locking system consists of three screw-locking points. Each screw-locking point includes a positioning rod (5) located inside the lower part (2) of the filter disc. A spring (10) is sleeved on the lower outer side of the inner rod (5), and the upper part is used to install the limiting stop (3) through a flexible mounting component. The spring (10) and the positioning rod (5) are fixed to the bottom of the lower part (2) of the filter disc by a pan head screw (8). A washer (9) is added between the pan head screw (8) and the spring (10). When the upper part (1) of the filter disc and the lower part (2) of the filter disc are covered and installed, the spring (10) is in a compressed state, but not in a maximum compressed state.

8. The rotary integrated filter disc device for quick replacement of filter membranes of different specifications and sizes according to claim 7, characterized in that, The flexible mounting component is an E-type retaining ring (4). The E-type retaining ring (4) is located above the structure of the lower part (2) of the filter disc. The E-type retaining ring (4) is made of high elastic cobalt-based alloy MP35N wire and has a pentagonal cross-section as follows: the upper side is 0.8mm wide, the lower side is 0.6mm wide, and the height is 1.2mm. The inner ring is designed with a 30° inlet cone angle and has an asymmetrical opening structure. The opening angle of the asymmetrical opening structure is 45°. The left arm is 3.2mm long and the right arm is 2.8mm long. After installation, a pre-tightening torque is generated. The surface of the E-type retaining ring (4) is electrolytically polished and then ion-implanted with titanium nitride. Silicon nitride ceramic beads are embedded in the working contact area to reduce the wear rate.

9. The screw-type integrated filter disc device for quick replacement of filter membranes of different specifications and sizes according to claim 8, characterized in that, The main body of the positioning rod (5) is a stepped shaft structure, with a precision threaded section at the bottom, a guide section in the middle, and an integrated involute spline at the top. The positioning rod (5) has a cooling oil channel inside, which is connected to the outside through the micro-hole at the bottom to achieve circulating heat dissipation. The spring (10) is a variable pitch spiral structure that forms a nonlinear stiffness mechanical structure. The limiting stop (3) is made of TC6 titanium alloy by metal injection molding. The main body is a three-dimensional curved cam structure and a counterweight cavity is set in the non-working area of ​​the cam. The counterweight cavity is filled with tungsten copper alloy to adjust the moment of inertia and ensure that the operating torque is stable at a fixed value. The pan head screw (8) has 24-tooth star-shaped anti-slip texture and an R-type stress relief groove is set at the root of the thread to reduce the stress concentration coefficient. The gasket (9) is a three-layer composite structure with a wavy cross-section. The base layer of the three-layer composite structure is beryllium copper alloy, the middle layer is a polyimide insulating film, and the surface is covered with an expanded graphite layer.

10. The screw-type integrated filter disc device for quick replacement of filter membranes of different specifications and sizes according to claim 9, characterized in that, The filter disc device also includes multiple positioning screws (11) for connecting the filter disc to other equipment. The positioning screws (11) are stepped shaft composite structures, including three functional sections: a threaded locking section, a precision positioning section, and a drive bearing section. The positioning screws (11) are connected to other equipment through a sequential three-way positioning mechanism and a flexible locking mechanism. The three-way positioning mechanism includes the following stages: initial positioning stage, precision alignment stage, and working condition adaptive stage. In the initial positioning stage, the filter disc device is suspended above the flange of the other equipment by a hoisting tool. The positioning screws (11) are pre-inserted into the circumferentially distributed reamed holes of the filter disc device. At this time, the precision positioning section forms a guiding fit with the hole wall of the reamed hole. The positioning screws (11) are manually rotated to make the filter disc device flat. Preliminary leveling with a surface error ≤0.1mm / m; In the precision alignment stage, when the threaded section of the positioning screw (11) contacts the threaded hole of the flange, a torque wrench is used to tighten it in three stages, namely 30% target torque, 60% target torque and 100% target torque. During this process, the precision positioning section and the reamed hole form a radial constraint to eliminate the lateral displacement caused by equipment vibration; The end face of the flange and the support surface of the filter disc device generate a normal clamping force through the axial tension of the positioning screw (11); The tapered screw head of the positioning screw (11) and the countersunk hole form an angular positioning to suppress the rotation of the filter disc device around the Z-axis; In the working condition adaptive stage, the small gap of the precision positioning section allows the filter disc device to expand under heat to avoid thermal stress concentration, while also withstanding micro-amplitude vibration; The flexible locking mechanism includes: in the flange sealing groove area, the positioning screw (11) away from the sealing ring is set to undertake the main positioning function, and the positioning screw (11) close to the sealing ring is set to reduce the preload, thereby forming a functional synergy with the sealing element.

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