Integrated filter disc device capable of quickly replacing filter membrane

Abstract

The invention relates to an integrated filter disc device capable of quickly replacing a filter membrane. The limiting rotary baffle is used for tightly fixing the filtering disc upper part and the filtering disc lower part, a porous net-shaped filtering disc is arranged in an inner space formed by the filtering disc upper part and the filtering disc lower part, and a replaceable filtering membrane is placed on the porous net-shaped filtering disc. Sealing rubber rings are embedded in the lower part of the upper part of the filtering disc and the upper part of the lower part of the filtering disc; a gasket is arranged in the lower portion of the filter disc, the porous net-shaped filter disc is arranged on the gasket to play a supporting role, and a corresponding sealing rubber ring above the lower portion of the filter disc is embedded below the gasket. The invention further discloses application of the integrated filter disc device capable of rapidly replacing the filter membrane in an original microorganism enrichment instrument. The original microorganism enrichment instrument comprises a peristaltic pump, a machine shell, a filtering disc device, a water pipe guiding device, a filtering bag, a printer, a liquid crystal screen, a main board, a controller, a preprocessing storage device, a liquid level sensor, a pressure sensor, an electromagnetic valve, a photoelectric sensor and a flow sensor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filter components, in particular to a filter disc device with integrated and quickly replaceable filter membrane. BACKGROUND

[0002] As a core bearing device supporting filter membrane, the rationality of the structural design of the filter membrane disc directly determines the stability and reliability of the filtration system, and plays an irreplaceable role in precise filtration scenarios such as environmental monitoring, industrial processes and laboratory analysis. A typical filter membrane disc is composed of a support skeleton made of high-strength engineering plastic or metal alloy and an elastic sealing element. The skeleton is designed with a honeycomb or radial reinforcing rib to ensure resistance to deformation under high pressure. The silicone or fluororubber sealing ring nested in the groove of the skeleton bears the fluid sealing responsibility of the membrane edge. This double-layer structure not only guarantees mechanical strength, but also must achieve zero-gap fitting of the filter membrane. Any micron-level warping or displacement will cause the filtered liquid to leak from the bypass, which may reduce the target particle retention efficiency or even cause experimental data distortion or production line pollution accidents. The screw fastening scheme commonly used in the prior art can provide stable mechanical pressure, but it has multiple hidden dangers. The operator needs to use a torque wrench to screw eight to twelve miniature stainless steel bolts into the skeleton screw hole one by one. This process not only consumes time and effort, but also causes radial shear force when the bolt is tightened, which easily produces star-shaped cracks on the surface of the polycarbonate filter membrane. These invisible micro-damages will expand into penetrating cracks under a working pressure of 0.3 MPa, resulting in a 23% increase in false negative rate in E. coli detection experiments. More troublesome is that the thread slipping phenomenon caused by repeated disassembly and assembly forces the entire filter membrane disc to be scrapped, significantly increasing laboratory consumable costs. Another clamping device seems to simplify the operation process, but it introduces new failure risks. When the system experiences hydraulic pulse impact, the wedge-shaped locking block of the V-shaped spring clamp produces millimeter-level displacement due to high-frequency vibration, causing the filter membrane edge to partially detach and form a wedge-shaped leakage channel. Electron microscope observation shows that such leakage causes the retention rate of 0.22 μm aperture filter membrane for Staphylococcus aureus to drop from 99.99% to 87.4%. In the online sterilization filtration scene in the pharmaceutical industry, uneven stress distribution of the clamp has caused sealing failure, resulting in visible foreign matter exceeding the standard in a batch of injection liquids, with direct economic losses of over one million. Especially when handling high-viscosity fluids such as fermentation liquid extracts, the elastic creep of the clamp support arm is induced by the viscous resistance of the membrane, and the initial clamping force of the clamp decays by 37% after 48 hours of continuous operation. At this time, a separation gap of up to 50 μm is generated between the center of the filter membrane and the skeleton, completely destroying the filtration integrity. These structural defects are essentially due to the fact that the traditional fixing method cannot meet the three requirements of "non-damage installation", "dynamic sealing maintenance" and "anti-vibration interference", forcing the operator to make a difficult trade-off between filtration efficiency and membrane loss.

[0003] Therefore, developing a filter fixing structure without tool intervention, eliminating stress concentration and having self-compensating sealing capability has become a key technical breakthrough direction to improve the reliability of the precision filtration system. Its value not only lies in simplifying the experimental operation process, but also extends to guaranteeing the sterile environment of vaccine production, the cooling water purification system of nuclear power plants and other major engineering fields with strict requirements for filtration stability, especially in water pathogenic microorganism enrichment instruments. SUMMARY

[0004] The purpose of the present application is to provide a filter disc device with integrated and quickly replaceable filter membranes, which solves the problems of complex operations such as screwing or using clamps by changing the fixing method that needs to borrow additional parts and tools; at the same time, a unique sealing structure is adopted between the filter membrane discs to ensure no leakage during filtration and improve the filtration effect.

[0005] The present application provides a filter disc device with integrated and quickly replaceable filter membranes, which is applied to a primary microorganism enrichment instrument, comprising:

[0006] A plurality of limit rotary stops (3) are used to tightly fix the upper part (1) and the lower part (2) of the filter disc, a porous mesh filter disc (7) is arranged 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:

[0007] The lower part of the filter disc upper part (1) and the upper part of the filter disc lower part (2) are both embedded with a sealing rubber ring (13);

[0008] A gasket (12) is arranged in the lower part of the filter disc (2), the porous mesh filter disc (7) is placed on the gasket (12) to support the porous mesh filter disc (7), and the lower part of the gasket (12) is embedded with the corresponding sealing rubber ring (13) in the upper part of the filter disc lower part (2).

[0009] Preferably, N rotary locking systems are arranged at the circumferential N equal division positions of the filter disc lower part (2), the rotary locking systems are used to install the limit rotary stops (3), one or more of the limit rotary stops (3) are twisted to make the limit rotary stops (3) firmly fix the porous mesh filter disc (7), so as to ensure the filtration effect; or the limit rotary stops (3) are twisted off, the filter disc upper part (1) is removed to replace the filter membrane (6).

[0010] Preferably, the N-torque locking system is a three-torque site, which includes a positioning rod (5) arranged inside the lower part (2) of the filter disc, a spring (10) arranged outside the lower side of the internal rod (5), and an upper part for mounting the limiting rotary stop (3) through a flexible mounting member; the spring (10) and the positioning rod (5) are fixed at the bottom of the lower part (2) of the filter disc through a disc head screw (8), wherein an additional gasket (9) is arranged between the disc head screw (8) and the spring (10); when the upper part (1) and the lower part (2) of the filter disc are mounted in a cover manner, the spring (10) is in a compressed state, but not in a maximum compressed state; the flexible mounting member is an E-shaped retainer ring (4), which is arranged above the structure of the lower part (2) of the filter disc.

[0011] Preferably, the filter disc device further comprises a plurality of positioning screws (11) arranged for connecting the filter disc with other equipment; the positioning screw (11) is a stepped shaft composite structure, which includes three functional segments, i.e., a threaded locking segment, a precise positioning segment, and a driving bearing segment; the positioning screw (11) is connected with other equipment through a three-way positioning mechanism and a flexible locking mechanism in sequence; the three-way positioning mechanism corresponds to stages including an initial positioning stage, a precise centering stage, and a working condition self-adapting stage; in the initial positioning stage, the filter disc device is suspended above a flange of the other equipment through a hoisting tool, and the positioning screw (11) is pre-inserted into hinge holes uniformly distributed around the filter disc device; at this time, the precise positioning segment is in a guided cooperation with the hole wall of the hinge hole, and the positioning screw (11) is manually rotated to realize a preliminary leveling of the filter disc device with a flatness error of ≤0.1 mm / m; in the precise centering stage, when the threaded segment of the positioning screw (11) contacts the threaded hole of the flange, a torque wrench is used to tighten in three stages, i.e., 30% target torque, 60% target torque, and 100% target torque; in this process, the precise positioning segment is radially constrained with the hinge hole to eliminate the transverse displacement caused by equipment vibration; the end surface of the flange and the supporting surface of the filter disc device generate a normal pressing force through the axial tension of the positioning screw (11); the conical screw head of the positioning screw (11) and the counterbore form angular positioning to inhibit the rotation of the filter disc device around the Z-axis; in the working condition self-adapting stage, the small gap of the precise positioning segment allows the filter disc device to expand due to heat to avoid thermal stress concentration, and simultaneously withstands vibration with a small amplitude;

[0012] The flexible locking mechanism includes: in the flange sealing groove area, the positioning screw (11) away from the sealing ring is set to bear the main positioning function, and the positioning screw (11) close to the sealing ring is set to reduce the pre-tightening force, thereby forming a functional synergy with the sealing element.

[0013] The second aspect of the present application provides the application of the filter disc device with integrated and quickly replaceable filter membrane in the original microorganism enrichment instrument, wherein the original microorganism enrichment instrument comprises:

[0014] The power and flow path control system is composed of a peristaltic pump (1'), a water pipe distributor (4') and a solenoid valve (12');

[0015] The microorganism enrichment core module is composed of the filter disc device (3') and the filter bag (5') of the first aspect;

[0016] The sensing and feedback system is composed of a liquid level sensor (10'), a pressure sensor (11'), a photoelectric sensor (13') and a flow sensor (14');

[0017] The control and output center is composed of a mainboard and a controller (8'), a liquid crystal screen (7') and a printer (6'); and

[0018] The auxiliary function module is composed of a pretreatment storage (9') and a machine shell (2').

[0019] Preferably, in the power and flow path control system, the peristaltic pump (1') is fixed on the shockproof support of the left inner wall of the machine shell (2'), the inlet of the peristaltic pump (1') is directly connected with the bottom outlet of the pretreatment storage (9'); the peristaltic pump (1') is connected with the PWM control port of the mainboard and the controller (8') through a stepping motor driver, and the outlet of the peristaltic pump (1') is connected with the central input port of the water pipe distributor (4') through a silica gel hose;

[0020] The water pipe distributor (4') is located on the upper platform in the middle of the machine shell (2'), and the filter disc device (3') is located directly below; the water pipe distributor (4') comprises an input port and three output ports, wherein the input port receives the output flow path of the peristaltic pump (1'), the three output ports are respectively a main output port, a bypass return port and a cleaning liquid interface, the main output port is vertically connected with the water inlet nozzle of the filter disc device (3'), the bypass return port returns to the pretreatment storage (9') through the solenoid valve (12'), and the cleaning liquid interface is connected with a disinfectant storage tank;

[0021] The solenoid valve (12') is integrated in the bypass outlet end of the water pipe distributor (4'), the valve body of the solenoid valve (12') is embedded in the aluminum alloy heat dissipation base of the water pipe distributor (4'), the solenoid valve (12') is connected with the relay module of the mainboard and the controller (8') through a coil driving wire, the pressure sensor (11') is installed before the solenoid valve (12'), and the pipeline after the solenoid valve (12') returns to the pretreatment storage (9');

[0022] The peristaltic pump (1') adopts a three-roller high-precision extrusion structure and a pulse conveying mode. The pump head pressure of the peristaltic pump (1') is adjustable in a range of 0.1-0.5 MPa. The PTFE coating is embedded in the hose channel to resist biofilm adhesion. The main body of the water pipe distributor (4') is a stainless steel three-dimensional flow channel block. The inner wall is electrolytically polished. The curvature radius of the flow channel turning part is ≥5D to suppress turbulence. The electromagnetic valve (12') is a normally closed diaphragm valve. The electromagnetic valve (12') has a conical valve seat for forming a Venturi effect when the electromagnetic valve (12') is opened, accelerating the bypass backflow to prevent particle deposition.

[0023] Preferably, in the microbial enrichment core module, the filter disc device (3') is located in the central operation area of the cabinet (2'), and is fixed to the stainless steel supporting platform at the bottom of the cabinet (2') through a quick-release buckle. The filter disc device (3') includes a water inlet nozzle, a filtrate outlet, and an electrical signal interface. The water inlet nozzle connects the main output flow path of the water pipe distributor (4'). The filtrate outlet is connected to the input port of the filter bag (5') through an L-shaped conduit. The electrical signal interface is used to connect the transmitting end of the photoelectric sensor (13'). The filter bag (5') is located below the right side of the filter disc device (3') and is inserted into a special constant-temperature card slot. The input port of the filter bag (5') connects the filtrate of the filter disc (3'). The output port of the filter bag (5') is connected to the waste liquid tank through the flow sensor (14');

[0024] The filter disc device (3') adopts a cam-claw mechanism with a knob lock to obtain or release the filter membrane clamping force. The filter bag (5') has a multi-layer composite membrane structure. The multi-layer composite membrane structure includes a three-dimensional wrinkle structure formed by a pre-filter layer, a main enrichment layer, and a support layer. The pre-filter layer is a 50μm nylon net used for intercepting large particles. The main enrichment layer is a 0.45μm mixed cellulose ester membrane used for retaining microorganisms. The support layer is a polypropylene non-woven fabric used for resisting hydraulic impact.

[0025] Preferably, in the sensing and feedback system, the liquid level sensor (10') is arranged on the inner wall top of the pretreatment reservoir (9'), the probe extends to a certain height from the tank, and the I2C bus is directly connected to the ADC acquisition module of the mainboard and controller (8'); the pressure sensor (11') is embedded in the sidewall of the water inlet channel of the filter disc device (3'), the sensing surface is flush with the flow channel, and the Wheatstone bridge output is connected to the differential amplification circuit of the mainboard and controller (8'); the photoelectric sensor (13') is connected across the transparent observation window of the filter disc device (3'), and the infrared emission / reception unit is connected to the optical detection interface of the mainboard and controller (8') respectively; the photoelectric sensor (13') has a dual-wavelength detection system of 850nm and 1300nm, the 850nm channel monitors bubbles, and the 1300nm channel identifies the turbidity change of the filter membrane; the flow sensor (14') is arranged in the middle of the straight pipe section of the outlet pipeline of the filter bag (5'), and the pulse output signal is connected to the counter port of the mainboard and controller (8').

[0026] The liquid level sensor (10') is a capacitive non-contact sensor, and the titanium alloy probe surface is coated with a Parylene C coating to resist protein adsorption; the pressure sensor (11') is formed by laser welding a MEMS piezoresistive chip with a 316L stainless steel diaphragm, which is used to trigger the automatic backwashing program when the pressure exceeds 0.4MPa due to filter membrane blockage; the flow sensor (14') adopts a turbine type metering structure.

[0027] Preferably, in the control and output hub, the mainboard and controller (8') are located in the sealed cabin at the rear of the casing (2'), and are attached to the aluminum alloy heat dissipation shell of the casing (2') through a heat-conducting silicone pad; the mainboard and controller (8') include an STM32H743 master control chip for processing sensor data, an FPGA logic unit for generating a peristaltic pump (1') control waveform, an RS485 bus for connecting a liquid crystal screen (7') and a printer (6'), and an isolated CAN interface for connecting an external pretreatment reservoir (9') temperature control module; the liquid crystal screen (7') is arranged in the center of the operation panel of the casing (2') inclined by 30°, and is connected to the graphics accelerator of the mainboard and controller (8') through an LVDS interface; the printer (6') is arranged in the special chute at the lower right side of the casing (2'), and is connected to the mainboard and controller (8') through a thermal printing interface.

[0028] Preferably, in the auxiliary function module, the pretreatment storage (9') is located in a pull-out compartment on the left side of the casing (2'). The inlet of the pretreatment storage (9') is connected to the sampling tube, the bottom outlet is connected to the peristaltic pump (1'), and the top air inlet is connected to the sterilization filter of the filter pack (5'). The pretreatment storage (9') is a borosilicate glass tank covered with a metal wire mesh explosion-proof cover, and is equipped with a magnetic stirring module and a Peltier temperature control system inside. The interior of the casing (2') includes multiple modular compartments, namely a left power compartment, a central enrichment compartment, a right control compartment, and a top flow path layer. The left power compartment is used to accommodate the peristaltic pump (1') and the pretreatment storage (9'). The central enrichment compartment is used to install the filter disc device (3') and the filter pack (5'). The right control compartment is used to integrate the motherboard and controller (8') and the power module. The top flow path layer is used to arrange the water pipe distributor (4') and the sensing and feedback system.

[0029] The integrated filter disc device with a quickly replaceable filter membrane of the present invention, and its application in the original microbial enrichment instrument, have the following beneficial effects:

[0030] With its reasonable design, simple structure, and convenient operation, it effectively improves the efficiency and ease of replacing filter membranes. Specifically:

[0031] (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.

[0032] (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;

[0033] (3) 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;

[0034] (4) 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;

[0035] (5) The number and position of the limit stop can be increased according to actual needs to meet different installation and fixing requirements.

[0036] (6) Unique “single-sided maintenance architecture”: all key components can be accessed by removing the right side panel, improving maintenance efficiency by 60%.

[0037] (7) With system-level cooperative mechanism, including: when starting the enrichment program, the liquid level sensor 10' detects that the sample amount of the pretreatment storage 9' reaches the standard → the peristaltic pump 1' extracts the sample at the preset flow rate → the water pipe distributor 4' guides the water flow into the filter disc device 3' → the pressure sensor 11' monitors the filter membrane permeability → the photoelectric sensor 13' confirms that there is no bubble interference → the microorganisms are intercepted on the membrane surface of the filter bag 5' → the flow sensor 14' measures the filtered volume → the mainboard and the controller 8' generate an enrichment report and send it to the printer 6'. The whole process is dynamically displayed on the liquid crystal screen 7', and any abnormality will trigger the electromagnetic valve 12' to switch to the cleaning mode. The quick-change design of the filter disc device 3' has a core value in this system: when replacing filter membranes of different pore sizes (such as 0.22 μm for viruses and 0.45 μm for bacteria), the operator can complete the sealed switching without tools, and the constant pressure characteristic of the cam mechanism ensures consistent clamping force for different batches of filter membranes. Experiments show that this design reduces the filter membrane breakage rate from 12% in the traditional fixed mode to 0.3%, and the standard deviation of the enrichment recovery rate is reduced to ±1.8% (n=30), significantly improving the reliability of pathogen detection. Through the deep integration of modular flow path and intelligent sensing, the whole machine realizes full-automatic closed-loop control from rising to microorganism enrichment, providing key technical support for water quality safety monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the specific embodiments or related art of the present application, the drawings needed to be used in the specific embodiments or related art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0039] Figure 1 is a schematic diagram of the three-dimensional structure of the filter disc of the present application;

[0040] Figure 2 is a front view of the filter disc of the present application;

[0041] Figure 3 is a top view of the filter disc of the present application;

[0042] Figure 4 is a schematic diagram of the structure of the screw locking system of the present application;

[0043] Figure 5 is a schematic diagram of the structure and position of the gasket and the sealing rubber ring of the present application;

[0044] Figure 6 is a schematic diagram of the limit rotary catch structure of the present application.

[0045] Figure 7 is a structural diagram of the waterborne pathogenic microorganism enrichment instrument of the present application. Figure 7(a) is a left view, figure 7(b) is a front view, figure 7(c) is a right view, figure 7(d) is an internal structure cross-sectional view, and figure 7(e) is a top view.

[0046] In the figure: 1 - upper part of filter disc; 2 - lower part of filter disc; 3 - limit rotary stop; 4 - E-shaped retainer; 5 - positioning rod; 6 - filter membrane;

[0047] 7 - porous mesh filter disc; 8 - disc head screw; 9 - gasket; 10 - spring; 11 - set screw; 12 - gasket; 13 - sealing rubber ring.

[0048] 1' - peristaltic pump; 2' - machine shell; 3' - filter disc device; 4' - water pipe distributor; 5' - filter bag; 6' - printer;

[0049] 7' - liquid crystal screen; 8' - mainboard and controller; 9' - pretreatment storage; 10' - liquid level sensor; 11' - pressure sensor; 12' - electromagnetic valve; 13' - photoelectric sensor; 14' - flow sensor. DETAILED DESCRIPTION

[0050] The technical solutions of the present application will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0051] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0052] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] Embodiment one

[0054] As Figures 1 to 6 shown, the embodiment provides a filter disc device with replaceable filter membrane, comprising:

[0055] The upper part 1 and the lower part 2 of the filter disc are tightly fixed by the plurality of limit rotary catches 3, and the internal space formed by the upper part 1 and the lower part 2 of the filter disc is provided with a porous mesh filter disc 7, and the replaceable filter membrane 6 is placed on the porous mesh filter disc 7.

[0056] The lower part of the upper part 1 of the filter disc and the upper part of the lower part 2 of the filter disc are both embedded with a sealing rubber ring 13.

[0057] In the embodiment:

[0058] The upper part 1 of the filter disc is made of high-precision 316L stainless steel and is formed by five-axis CNC machining, and the whole is in the shape of a disc-shaped dome structure, and the diameter tolerance is controlled within ±0.02mm. The bottom is designed with a trapezoidal sealing groove with a depth of 1.8±0.05mm, and the groove wall has an inclination angle of 45° to optimize the stress distribution, and a fluororubber (FKM) sealing rubber ring 13 with a Shore hardness of 75±5A is embedded in the groove, and the rubber ring cross-section is in the shape of a pentagon, with a top thickness of 2.0mm and a bottom width of 3.5mm, and the molecular level interface is combined by vacuum hot pressing process. The inner surface of the dome is electrolytically polished to Ra0.1μm, and 36 φ0.8mm flow guiding micro-holes are distributed in the central area, arranged in a radial manner, with an opening rate of 38% to ensure the uniformity of the flow field.

[0059] 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 bearing platform with a thickness of 3.0mm, and the platform surface is laser etched with concentric circle flow guiding lines with a depth of 0.15mm; the middle layer is a diameter-gradually-changing supporting wall with a wall thickness of 1.5mm and a 0.5° demolding taper; and the bottom layer integrates a flange base with a thickness of 4.0mm. The upper sealing groove adopts a bidirectional dovetail groove design, with a groove depth of 2.2mm, and a silicone rubber (VMQ) sealing ring (13) with a Shore hardness of 60±5A is embedded therein, which innovatively adopts a wave-shaped cross-section with a wave peak height of 0.8mm and a wave length of 2.0mm, and a compression resilience rate of >98%. Three groups of high-precision positioning holes are uniformly distributed on the edge of the base, and the positional error is ≤0.01mm.

[0060] The porous mesh filter disc 7 is integrally formed by selective laser melting (SLM) technology from medical-grade titanium alloy TC4 and has a honeycomb-like topological structure. The disc body is 1.2 mm thick, the surface is covered with a hexagonal micropore array of φ80-200 μm, the porosity is as high as 85±2%, and the edges of the through holes are micro-blasted to form a round corner of R0.05 mm. A ring-shaped titanium alloy reinforcing rib is welded at the bottom of the disc body, the rib is 0.8 mm high and 1.0 mm wide, and the compressive strength is increased to 280 MPa. The key innovation is the stepped locking structure of the edge: the upper layer is an L-shaped step with a width of 0.6 mm, and the lower layer is a V-shaped positioning groove with a depth of 0.4 mm, and the two structures cooperate to realize multi-dimensional positioning of the filter membrane.

[0061] The replaceable filter membrane 6 is designed differently according to the application scenarios: in the field of biological pharmaceuticals, a three-layer composite structure is adopted, the upper layer is a 50 μm thick polyether sulfone (PES) pre-filter layer, the middle layer is a 0.22 μm pore size nylon 66 nanofiber membrane, and the lower layer is a composite 120 gsm polyester non-woven fabric reinforced base; for industrial filtration, a 0.45 μm PTFE membrane is selected and combined with a 316L sintered metal mesh, with a thickness of 0.25±0.03 mm. The edges of all filter membranes are laser-cut to form a 0.3 mm thick sealing flange, and the flange surface is coated with silicone pressure-sensitive adhesive, which can achieve instantaneous adhesive sealing under a pressure of 0.15 MPa.

[0062] The dynamic cooperation between the components reflects the 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, and the silicone rubber sealing ring generates a radial compensation force of 0.8 MPa. The reinforcing rib of the porous mesh filter disc 7 forms a 0.05 mm gap with the lower bearing platform, which not only ensures the thermal expansion allowance but also avoids vibration displacement. The entire system has a sealing contact pressure fluctuation rate of <5% under the working conditions of -20℃ to 150℃, achieving a truly zero-leakage seal.

[0063] As a preferred embodiment, the inside of the lower part 2 of the filter disc is provided with a gasket 12, and the porous mesh filter disc 7 is placed on the gasket 12 to support the porous mesh filter disc 7, and the gasket 12 is embedded in the corresponding sealing rubber ring 13 on the upper part of the lower part 2 of the filter disc.

[0064] In this embodiment:

[0065] The gasket 12 is made of cold-rolled 316L stainless steel with multi-stage aging hardening treatment, forming a double-layer composite structure with a thickness of 1.5±0.02 mm. The upper layer is a laser-etched micro-bump array containing 1200 φ0.3 mm hemispherical protrusions per square centimeter, with a height of 0.15 mm, increasing the static friction coefficient with the porous mesh filter disc (7) to 0.85 through surface micro-texturing; the lower layer is designed with a dovetail groove with a depth of 0.8 mm, with a groove wall angle of 60° and a surface electrolytic polishing to Ra0.2 μm, precisely accommodating the sealing rubber ring (13). The gasket outer diameter tolerance is strictly controlled within IT6 level (±0.008 mm), and the edge is designed with an R0.1 mm blade, forming a line contact seal in cooperation with the lower part of the filter disc (2). The innovative thermal management design is reflected in the material selection: the core layer is a high-thermal-conductivity beryllium copper alloy (thermal conductivity 210 W / m·K), with 50 μm thick 316L stainless steel on both sides, stabilizing the thermal expansion coefficient at (20-150℃ interval), with a titanium alloy filter disc thermal deformation difference <0.003 mm / 100℃.

[0066] The sealing rubber ring 13 adopts a creative sandwich composite structure: the core layer is a fluororubber (FKM) with a Shore hardness of 80A, providing the main sealing function, the middle layer is a graphene-containing silicone rubber (VMQ) for thermal compensation, and the outer layer is covered with a 0.05 mm thick polytetrafluoroethylene (PTFE) film to reduce the friction coefficient. The cross section is an asymmetric trapezoid with an upper base width of 2.0 mm, a lower base width of 3.2 mm, and a height of 1.5 mm. The trapezoidal waist line is designed as an involute with a curvature radius of 0.5 mm, ensuring the generation of nonlinear sealing force during compression. The material formula is specially optimized: the fluororubber is added with 25% carbon fiber to improve the creep resistance, the silicone rubber is mixed with nano-silicon dioxide to enhance the resilience (compression permanent deformation <3%), and the PTFE layer is activated by plasma to realize molecular-level bonding. After installation, it presents a double-acting mechanism - in the vertical direction, it generates a contact stress of 1.2-1.8 MPa under the pressure of the gasket, and in the radial direction, it expands 0.15 mm due to the material's Poisson effect, completely filling the sealing groove with a micro-gap of 0.02 mm level.

[0067] It can realize dynamic sealing performance, and its working principle is: when the system is pressurized to 0.8 MPa, the gasket 12 deforms elastically, with a center sinking amount of 0.03 mm, evenly transmitting the load to the sealing rubber ring 13. At this time, the trapezoidal cross section of the rubber ring changes shape: the upper base expands by 18% to tightly fit the lower surface of the gasket, the lower base compresses by 25% to embed into the sealing groove of the lower part 2 of the filter disc, and the involute waist line expands into a continuous curvature surface, forming a triple dynamic sealing band. Under temperature cycling conditions (-20℃ to 121℃), the silicone rubber middle layer plays a thermal buffer role - when it contracts at low temperature, it releases the pre-stored elastic potential energy to compensate for the gap, and when it expands at high temperature, it quickly conducts heat through the graphene network, making the interface contact pressure fluctuation rate <5%. Through helium mass spectrometry leak detection verification, this structure has a leakage rate , surpassing the highest sealing level requirement of ISO 5208.

[0068] Surface treatment process further strengthens performance: the gasket 12 is formed with a 20 μm thick compound layer by low-temperature ion nitriding, the surface hardness reaches HV1200, and the friction pair life is increased to times; the sealing rubber ring 13 uses molecular-level grafting technology to build a fluorine-containing silane self-assembled monolayer (film thickness 8 nm) on the PTFE surface, so that the dynamic friction coefficient is reduced to 0.03. Extreme environment tests show that the system can resist the erosion of strong acid (40% HNO3), strong alkali (30% NaOH) and organic solvent (DMSO), with a volume change rate of <±1.5%, and a sealing force attenuation of <0.5% / h under 10Hz-200Hz mechanical vibration, providing unprecedented reliable sealing protection for the filtration system.

[0069] As a preferred embodiment, the vertical projections of the filter disc upper part 1 and the filter disc lower part 2 are both circular.

[0070] As 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.

[0071] As a preferred embodiment, the diameter of the porous mesh filter disc 7 is equal to the inner diameter of the filter disc lower part 2, and the porous mesh filter disc 7 is embedded in the filter disc lower part 2.

[0072] As a preferred embodiment, N screw locking systems are respectively arranged at the equal divisions along the circumference N of the filter disc lower part 2, the screw locking systems are used to install the limiting rotary stop 3, by screwing one or more of the limiting rotary stop 3, the limiting rotary stop 3 firmly fixes the porous mesh filter disc 7, thereby ensuring the filtration effect; or by unscrewing the limiting rotary stop 3, the filter disc upper part 1 is removed to replace the filter membrane 6.

[0073] As a preferred embodiment, the N screw locking systems are three screwing sites.

[0074] As a preferred embodiment, the screwing sites include a positioning rod 5 arranged inside the filter disc lower part 2, the outer lower side of the inner rod 5 is sleeved with a spring 10, and the upper part is used to install the limiting rotary stop 3 through a flexible mounting member; the spring 10 and the positioning rod 5 are fixed at the bottom of the filter disc lower part 2 by a pan head screw 8, wherein an additional gasket 9 is attached between the pan head screw 8 and the spring 10, thereby preventing component damage caused by collision and rigid friction between each other and further causing fixation failure; when the filter disc upper part 1 and the filter disc lower part 2 are cover-mounted, the spring 10 is in a compressed state, but not in a maximum compressed state.

[0075] As a preferred embodiment, the flexible mounting is an E-ring 4 disposed above the structure of the lower portion 2 of the filter disc.

[0076] In this embodiment, the technical details of the screw locking system include:

[0077] The positioning rod 5 is made of 17-4PH precipitation hardened stainless steel and is formed by five-axis linkage machining. The main body is a stepped shaft structure with a diameter of Φ6.0±0.005mm: the lower part is designed with a M4×0.7 precision thread section (thread tolerance 4g level), the middle part is a light shaft guide section (surface plated hard chromium thickness 15μm, hardness HRC62), and the top part is innovatively integrated with involute spline teeth (module 0.5, pressure angle 30°, number of teeth 24). A cooling oil channel with a depth of 18mm is provided inside the rod body, which is connected to the outside through a radial Φ1.2mm micro-hole at the bottom to realize circulating heat dissipation. The heat treatment process adopts three-stage aging: 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 tooth top is specially designed with an R0.1mm round corner, which forms a surface contact with the E-ring (4) to reduce the stress concentration coefficient to less than 1.1.

[0078] The spring 10 is made of Cr-Si alloy spring steel wire (grade SWOSC-V) and is vacuum melted and drawn. The wire diameter is Φ1.2±0.01mm, and it is coiled into a variable pitch spiral structure with an outer diameter of Φ8.0mm and an effective number of turns of 8.5: 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 have a transition section with a pitch gradually changing from 2.5mm to 3.0mm (stiffness coefficient 80N / mm). This non-linear stiffness design makes the load fluctuation rate within the working stroke <3%. The surface treatment adopts a nano composite coating technology: first, an electro-deposited 5μm thick epoxy resin bottom layer, then sputtering a 2μm diamond-like carbon film (DLC), and the friction coefficient is reduced to 0.05. The free length is 15.0mm, the pre-compression is 12.0mm, the working stroke range is 8.0-10.5mm, and the fatigue life verification reaches (DIN EN 13906 standard).

[0079] The limit rotary catch 3 is made of TC6 titanium alloy by metal injection molding (MIM), and the main body is a three-dimensional curved cam structure: the base thickness is 4.0 mm, and the working curved surface is composed of an Archimedes 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 cladded in the contact area, the surface is finely ground to Ra0.05μm, and then micro-texture treatment is performed to form a micro-pit array with a diameter of Φ80μm and a depth of 20μm, and the oil storage rate is increased by 40%. A magnetic encoder (resolution 0.1°) is integrated on the back, and the rotation angle is fed back in real time through a Hall sensor. The innovation is to set a counterweight cavity in the non-working area of the cam, fill tungsten-copper alloy to adjust the moment of inertia to , and ensure that the operating torque is stable at 0.8-1.2N·m.

[0080] The disc head screw 8 implements the DIN 7985 standard but makes strengthened improvements: the head diameter is Φ10mm, the 24-tooth star-shaped anti-skid pattern (tooth depth 0.4mm, tooth angle 90°) is innovatively designed, the rod part is M4×0.7 fine thread (screw length 6mm), and A286 high-temperature alloy is selected as the material and cold-forged into shape. The core improvement is in the thread root: an R-shaped stress release groove (radius R0.2mm) is adopted, and a transition area of 30° unloading angle is matched, so that the stress concentration coefficient is reduced from 2.3 to 1.4. Double solid solution (980℃×1h oil quenching+720℃×16h air cooling) is adopted for heat treatment, the hardness reaches HRC38, and 90% strength is maintained at 400℃ working condition.

[0081] The gasket 9 is a three-layer composite structure: the base layer is beryllium copper alloy (C17200) with a thickness of 0.3mm, the middle layer is 0.1mm polyimide insulating film (temperature resistance 400℃), and the surface is covered with 50μm expanded graphite layer. The outer diameter is Φ8.5mm, the inner hole is Φ4.3mm, and the wave-shaped cross-section (amplitude 0.15mm, wavelength 1.2mm) is innovatively designed, and the compression resilience rate is >95%. The surface is coated with a composite coating (thickness 3μm, friction coefficient 0.08) by magnetron sputtering deposition , and 12 radial micro-oil grooves (width 0.1mm, depth 50μm) are laser processed to form a self-lubricating micro-circulation system.

[0082] The E-shaped retainer 4 is made of high-elasticity cobalt-based alloy (MP35N) wire, and the cross-section is a special pentagon: the upper edge is 0.8mm wide, the lower edge is 0.6mm wide, the height is 1.2mm, and the inner ring is designed with a 30° lead-in taper angle. The asymmetric opening structure is innovatively adopted-the opening angle is 45°, but the left arm is 3.2mm long and the right arm is 2.8mm long, and a pre-tightening torque of 0.15N·m is generated after installation. The surface is electrolytically polished, ion-implanted with titanium nitride (thickness 2μm, hardness HV2000), and in the working contact area, Φ0.3mm silicon nitride ceramic beads (spacing 0.8mm) are embedded to reduce the wear rate to .

[0083] 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 down 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... After one cycle, the axial displacement decreases by <0.01mm, and the rotation angle drifts. This will enable breakthroughs in the field of mechanical locking and achieve reliable performance.

[0084] In a preferred embodiment, the filter disc device further includes a plurality of positioning screws 11 for connecting the filter disc to other devices.

[0085] 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.

[0086] 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.

[0087] I. Structural Design of Positioning Screw 11

[0088] The positioning screw adopts a stepped shaft composite structure, and the main body is divided into three functional sections:

[0089] 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.

[0090] 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 mm), surface roughness Ra≤0.8μm. This section forms an H7 / h6 clearance fit with the positioning hole of the filter disc. This enables precise radial positioning.

[0091] 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.

[0092] II. The manufacturing of positioning screw needs 7 key processes, and ISO 2768-mK level precision standard is implemented throughout the whole process:

[0093] 1. Material preparation: 42CrMo bar is treated by vacuum degassing, and the hardness is reduced to 180HB after spheroidizing annealing to improve the subsequent cutting performance.

[0094] 2. Precision turning: rough turning is completed on a Swiss type longitudinal turning lathe, and a 0.3mm finishing allowance is reserved. The positioning section is precisely turned at a linear speed of 120m / min using CBN tools, and the size fluctuation is controlled within ±0.005mm.

[0095] 3. Thread processing: the thread is cold formed by a numerical control thread rolling machine, and TiN coating (thickness 3μm) is applied to the tooth surface to reduce the friction coefficient. 100% GO / NOT GO gauge detection, thread pitch diameter error ≤0.01mm.

[0096] 4. Heat treatment strengthening: quenching and tempering treatment (850℃ quenching + 540℃ tempering) is carried out in a controlled atmosphere furnace, the surface hardness reaches HRC32-36, and the core maintains HRC28-32 toughness.

[0097] 5. Precision grinding: the precision positioning section is ground by a centerless grinding machine (Grit 120 white corundum grinding wheel) in three stages: coarse grinding removes 0.15mm, semi-fine grinding leaves 0.01mm, and final grinding uses 0.5μm feed to achieve mirror surface effect.

[0098] 6. Surface strengthening: QPQ salt bath composite treatment (580℃ nitriding + 380℃ oxidation) is carried out, forming a 15μm nitriding layer and a 2μm oxidation film, and the salt spray test reaches 720 hours.

[0099] 7. Full size detection: the three coordinate measuring machine (CMM) is used to verify the cylindricity of the positioning section (≤0.005mm) and the thread axis coaxiality (φ0.01mm) by laser scanning.

[0100] III. Connection working principle and dynamic characteristics

[0101] The positioning screw realizes the connection of the filter disc and other equipment, especially the "three-way positioning + flexible locking" function of the flange of other equipment, and its working process is as follows:

[0102] 1. Initial positioning stage: the filter disc is suspended above the equipment flange by hoisting tools, and the operator inserts the positioning screw (11) into the hinge hole (usually 4-8) uniformly distributed around the filter disc. At this time, the precision positioning section forms a guide fit with the hole wall, and manual rotation of the screw can realize the preliminary leveling of the filter disc with a flatness error of ≤0.1mm / m.

[0103] 2. Precise centering phase: when the screw thread segment contacts the flange screw hole, a torque wrench is used to tighten in three stages (30%→60%→100% target torque). During this process:

[0104] (1) The screw positioning segment forms a radial constraint with the filter disc hole, eliminating lateral displacement caused by equipment vibration (limiting X / Y degree of freedom);

[0105] (2) The flange end face and the filter disc support surface generate a normal compression force through the axial tension of the screw (calculate the preload according to the VDI 2230 standard);

[0106] (3) The conical screw head and the counterbore form an angular positioning, suppressing the rotation of the filter disc around the Z-axis (limiting the θz degree of freedom).

[0107] 3. Working condition adaptive phase:

[0108] During system operation, the positioning screw exhibits the following dynamic characteristics:

[0109] (1) Anti-fretting: the small gap in the precise fit segment allows the filter disc to expand due to heat (ΔL=α·L·ΔT), avoiding thermal stress concentration. The QPQ surface treatment layer can withstand 107 times of micro-amplitude vibration.

[0110] (2) Vibration damping: the screw preload (usually 50-70% of the material yield strength) causes micro-plastic deformation of the joint surface, forming a contact damping ratio of the energy dissipation mechanism.

[0111] (3) Overload protection: when the system pressure suddenly changes, the positioning segment gap releases the impact energy first, avoiding the stress at the thread root exceeding the S-N curve endurance limit.

[0112] 4. Sealing synergy mechanism: It is worth noting that the positioning screw 11 and the sealing element form a functional synergy:

[0113] (1) In the flange sealing groove area, the screw arrangement follows the "hard-soft zoning" principle - the screw away from the seal ring undertakes the main positioning function, and the screw close to the seal ring has a 20% lower preload, avoiding excessive compression of the O-ring leading to seal failure.

[0114] (2) Dynamic pressure testing shows that this design can reduce the standard deviation of the sealing surface contact pressure from 1.2 MPa to 0.4 MPa, and the leakage rate to Class.

[0115] Through precise structure and process control, the positioning screw 11 realizes the precise constraint of the filter disc in the space six degrees of freedom, and has the working condition self-adaptive ability. The technical core of this "rigid positioning + flexible connection" is: to exchange system level operation reliability with micron level manufacturing precision, to resolve the traditional contradiction between strength and precision through mechanical structure design.

[0116] The technical problem solved by the application is that the filter disc has a porous mesh filter disc 7 inside, a gasket 12 is placed inside the filter disc, the gasket 12 is embedded with a sealing rubber ring 13, and the structure of the lower part 2 of the filter disc is tightly fitted, the filter membrane 6 is placed above the filter disc, the sealing rubber ring 13 is embedded in the structure of the upper part 1 of the filter disc, three screwing points are arranged around the structure of the lower part of the filter disc, and the structure is that the internal positioning rod 5 is sleeved with the spring 10 and the limiting rotary stop 3, the spring 10 and the positioning rod are fixed at the bottom of the lower part 2 of the filter disc by the disc head screw 8 and the gasket, and the E-shaped check ring 4 is arranged above the structure of the lower part of the filter disc to install the limiting rotary stop. When in use, the upper and lower structures of the filter disc are embedded, the limiting rotary stop is pulled, the limiting rotary stop is fixed by screwing, the spring is deformed and extruded to compactly fix the filter disc. The filter disc is tightly fixed by the elastic sealing rubber ring, forming a closed and stable filtering space. At the same time, the setting of the sealing rubber ring on the lower surface of the gasket ensures the sealing between the upper and lower filter discs, preventing leakage during the filtering process. In addition, the filter membrane can be quickly replaced through simple screwing operation, improving the filtering efficiency and use convenience.

[0117] Working principle:

[0118] In specific implementation, first, ensure that the gasket 12 and the sealing rubber ring 13 are correctly placed on the lower part 2 of the filter disc, the surface embedded with the sealing rubber ring 13 is fitted with the top surface of the lower part 2 of the filter disc, the porous mesh filter disc 7 is placed on the gasket 12, the filter membrane 6 is placed on the filter disc 7, and the sealing rubber ring 13 on the upper part 1 of the filter disc is correctly placed. Then, the upper part 1 of the filter disc is aligned with the lower part 2 of the filter disc and embedded, at this time, the sealing rubber ring 13 of the upper part 1 of the filter disc is in close contact with the filter disc 7, the filter disc 7 tightly clamps the gasket 12, and the sealing rubber ring 13 of the gasket 12 is in close contact with the lower part 2 of the filter disc. Finally, the limiting rotary stop 3 is firmly fixed to the filter disc by pulling the screwing point, forming a closed and stable filtering space. During use, the filter membrane 6 can be replaced at any time as needed, only need to simply unscrew the limiting rotary stop 3, remove the upper part 1 of the filter disc, replace the new filter membrane 6, and then assemble according to the above steps.

[0119] Example two

[0120] As shown in Figure 7, the embodiment provides an application of the filter disc device with integrated filter membrane capable of being quickly replaced in example one in the original microorganism enrichment instrument, wherein the original microorganism enrichment instrument comprises:

[0121] Peristaltic pump 1', housing 2', filter disc device 3' of embodiment one, water pipe distributor 4', filter bag 5', printer 6', liquid crystal screen 7', mainboard and controller 8', pretreatment storage 9', liquid level sensor 10', pressure sensor 11', electromagnetic valve 12', photoelectric sensor 13' and flow sensor 14'.

[0122] The original microorganism enrichment instrument is a core equipment for precise detection of pathogenic microorganisms in water bodies. Its structural design integrates fluid dynamics, automation control and microorganism separation technology. Through the deep cooperation of the above 14 functional modules, the whole process automation from sample pretreatment to microorganism enrichment is realized. Based on the application of the filter disc device 3 of embodiment one in the system, the position layout, connection logic and structural characteristics of each component are systematically analyzed:

[0123] (1) Power and flow control system, including:

[0124] 1. Peristaltic pump 1':

[0125] (1) Position: fixed on the shockproof support of the left inner wall of the housing 2', the inlet is directly connected to the bottom outlet of the pretreatment storage 9'.

[0126] (2) Connection relationship: connected with the PWM control port of the mainboard 8' through the stepping motor driver, and the outlet is connected to the central input port of the water pipe distributor 4' through the silica gel hose.

[0127] (3) Structural characteristics: three-roller high-precision extrusion structure is adopted, the pump head pressure is adjustable in the range of 0.1-0.5 MPa, and PTFE coating is embedded in the hose channel to resist biofilm adhesion. Its pulse delivery mode can avoid sample shear damage, and at the same time provides a dynamic flow reference for the pressure sensor 11'.

[0128] 2. Water pipe distributor 4'

[0129] (1) Position: located on the upper platform in the middle of the housing 2', and the filter disc device 3' is directly below.

[0130] (2) Connection relationship: the input port connects the output flow path of the peristaltic pump 1', and the three output ports are connected respectively:

[0131] A. Main output port: vertically downward connected to the water inlet nozzle of the filter disc device 3';

[0132] B. Bypass return port: returned to the pretreatment storage 9' through the electromagnetic valve 12';

[0133] C. Cleaning liquid interface: connected with a disinfectant storage tank;

[0134] (3) Structure features: The main body is a 316L stainless steel three-dimensional flow channel block, the inner wall is electrolytically polished to Ra≤0.8 μm, and the flow channel turning part adopts a slow bending design with a curvature radius ≥5D to suppress turbulent flow. Its core value lies in realizing the dead zone-free switching of the "sample-washing-calibration" flow path.

[0135] 3. Solenoid valve 12'

[0136] (1) Position: Integrated in the bypass outlet end of the water pipe distributor 4', the valve body is embedded in the aluminum alloy heat dissipation base of the distributor.

[0137] (2) Connection relationship: The coil driving wire is connected to the relay module of the mainboard and controller 8', a pressure sensor 11' is installed before the valve, and the pipeline returns to the pretreatment storage 9' after the valve.

[0138] (3) Structure features: Normally closed diaphragm valve, response time <20 ms, pressure rating 1.0 MPa. The specially designed conical valve seat can form a Venturi effect when opened, accelerating the bypass backflow to prevent particle deposition.

[0139] (II) Microbial enrichment core module

[0140] 1. Filter disc device 3'

[0141] (1) Position: Central operation area of the machine shell 2', fixed to the stainless steel support platform through quick-release buckles.

[0142] (2) Connection relationship:

[0143] A. Water inlet nozzle: Accepts the main output flow path of the water pipe distributor 4';

[0144] B. Filtrate outlet: Connects to the input port of the filter bag 5' through an L-shaped conduit;

[0145] C. Electrical signal interface: Connects to the transmitting end of the photoelectric sensor 13';

[0146] (3) Structure features (fusion of embodiment one innovation):

[0147] A. Quick-change mechanism: Discard traditional bolt fixation, adopt cam-claw mechanism with knob locking. The operator can release the filter membrane clamping force by rotating clockwise 30°, and the replacement time is shortened from traditional 3 minutes to 15 seconds.

[0148] B. Sealing design: Double-lip fluororubber sealing ring is embedded in the skeleton ring groove. When the upper lip is pressed, radial expansion force is generated, compensating for the filter membrane thickness tolerance (±0.05 mm), ensuring that the leakage rate is <1 μL / min under 0.25 MPa.

[0149] C. Anti-vibration structure: the bottom surface of the support skeleton is provided with a damping silica gel pad to attenuate the pulse vibration transmitted by the peristaltic pump 1' and avoid micro-displacement of the filter membrane.

[0150] 2. Filter bag 5'

[0151] (1) Position: located below the right side of the filter disc device 3', inserted into the special constant temperature card slot.

[0152] (2) Connection relationship: the input port receives the filtrate of the filter disc 3', and the output port is connected to the waste liquid tank through the flow sensor 14'.

[0153] (3) Structural features: multi-layer composite membrane structure, including:

[0154] A. Pre-filter layer: 50 μm nylon net to intercept large particles;

[0155] B. Main enrichment layer: 0.45 μm mixed cellulose ester membrane to intercept microorganisms;

[0156] C. Support layer: polypropylene non-woven fabric to resist hydraulic impact;

[0157] D. Unique three-dimensional wrinkle design to increase effective filtration area by 2.3 times, and maintain >99% E. coli retention rate at a flow rate of 200 mL / min.

[0158] (Three) Sensing and feedback system

[0159] 1. Liquid level sensor 10'

[0160] (1) Position: top of the inner wall of the pretreatment storage 9', the probe extends to a height of 50 mm from the bottom of the tank.

[0161] (2) Connection relationship: directly connected to the ADC acquisition module of the mainboard and controller through the I2C bus.

[0162] (3) Structural features: capacitive non-contact sensing, titanium alloy probe surface coated with Parylene C coating to resist protein adsorption. Its intelligent algorithm can distinguish bubbles from real liquid surface, with an accuracy of ±0.5 mm.

[0163] 2. Pressure sensor 11'

[0164] (1) Position: embedded in the side wall of the water inlet channel of the filter disc device 3', the sensing surface is flush with the flow channel.

[0165] (2) Connection relationship: the output of the Wheatstone bridge is connected to the differential amplification circuit of the mainboard and controller.

[0166] (3) Structural features: MEMS piezoresistive chip and 316L stainless steel diaphragm laser welding, temperature compensation range 4-60℃. When the filter membrane is blocked and the pressure >0.4MPa, the automatic backwashing program is triggered.

[0167] 3. Photoelectric sensor (13)

[0168] (1) Position: across the transparent observation window on both sides of the filter disc device 3'.

[0169] (2) Connection relationship: infrared emission / reception unit is connected to the optical detection interface of the mainboard and controller.

[0170] (3) Structural features: dual-wavelength detection system (850nm / 1300nm), 850nm channel monitors bubbles, 1300nm channel identifies filter membrane turbidity changes. Its differential algorithm can eliminate environmental light interference, and the bubble detection limit reaches φ0.5mm.

[0171] 4. Flow sensor 14'

[0172] (1) Position: middle of the straight pipe section of the filter bag 5' outlet pipeline.

[0173] (2) Connection relationship: pulse output signal is connected to the counter port of the mainboard and controller 8'.

[0174] (3) Structural features: turbine type metering structure, sapphire bearing cooperates with tantalum alloy rotor, linear error <2% in 1-500mL / min flow range. 18 pulses are generated per milliliter of flow, providing a reference for enrichment quantity calculation.

[0175] (Four) Control and output hub

[0176] 1. Mainboard and controller 8'

[0177] (1) Position: sealed cabin at the rear of the housing 2', through the heat-conducting silicone pad to fit the aluminum alloy heat dissipation shell.

[0178] (2) Connection relationship: as the core of the system, it integrates:

[0179] A. STM32H743 main control chip: process sensor data;

[0180] B. FPGA logic unit: generate peristaltic pump 1' control waveform;

[0181] C. RS485 bus: connect LCD screen 7' and printer 6';

[0182] D. Isolated CAN interface: external pre-processing memory 9' temperature control module

[0183] (3) Structure features: Four-layer PCB design, power / signal layer isolation, and key signal path with serpentine layout to resist electromagnetic interference. The customized firmware implements a PID flow control algorithm with a response time of ≤10 ms.

[0184] 2. Liquid crystal screen 7'

[0185] (1) Position: Central of the operation panel with a 30° forward inclination.

[0186] (2) Connection relationship: LVDS interface connects the mainboard and the graphics accelerator of the controller 8'.

[0187] (3) Structure features: 7-inch IPS touch screen with a resolution of 1280x800 and an anti-glare AR coating on the surface. The unique "flow path visualization interface" renders the water flow path and sensor data in real time, with abnormal parameters automatically marked with red flashing.

[0188] 3. Printer 6'

[0189] (1) Position: Inside the dedicated slide chute on the right lower side of the machine shell 2'.

[0190] (2) Connection relationship: Connects the mainboard and the controller 8' through the thermal printing interface.

[0191] (3) Structure features: Embedded thermal transfer printer with a printing speed of 80 mm / s and support for automatic cutter. Can output rich reports with two-dimensional codes, including filter membrane batch number, flow curve, and pressure fluctuation data.

[0192] (Five) Auxiliary function modules

[0193] 1. Pretreatment storage 9'

[0194] (1) Position: Left side of the machine shell 2' with a pull-out cabin.

[0195] (2) Connection relationship: Inlet connects the sampling tube, bottom outlet connects the peristaltic pump 1', and top air inlet connects the sterilization filter.

[0196] (3) Structure features: 500mL borosilicate glass tank body with a metal mesh explosion-proof cover. Built-in magnetic stirring module (300-1500rpm) and Peltier temperature control system (4-40℃±0.5℃) to ensure sample uniformity.

[0197] 2. Machine shell 2'

[0198] (1) Structure features: IP54 protection level full-metal structure with internal modular cabin design:

[0199] A. Left power cabin: Contains the peristaltic pump 1' and the pretreatment storage 9';

[0200] B. Central enrichment cabin: filter disc device 3' and filter bag 5' are installed;

[0201] C. Right control cabin: integrated mainboard and controller 8' and power module;

[0202] D. Top flow path layer: water pipe distributor 4' and sensor cluster are arranged.

[0203] Innovative "single-sided maintenance architecture": all key components can be accessed by removing the right panel, improving maintenance efficiency by 60%.

[0204] (Six) System-level collaborative working mechanism

[0205] When the enrichment program is started, the liquid level sensor 10' detects that the sample volume of the pretreatment storage 9' meets the standard → the peristaltic pump 1' extracts the sample at the preset flow rate → the water pipe distributor 4' guides the water flow into the filter disc device 3' → the pressure sensor 11' monitors the permeability of the filter membrane → the photoelectric sensor 13' confirms that there is no bubble interference → the microorganisms are intercepted on the surface of the filter bag 5' membrane → the flow sensor 14' measures the filtered volume → the mainboard and controller 8' generate an enrichment report and send it to the printer 6'. The whole process is dynamically displayed on the LCD screen 7', and any abnormality will trigger the electromagnetic valve 12' to switch to the cleaning mode.

[0206] The quick-change design of the filter disc device 3' has a core value in this system: when replacing filter membranes of different pore sizes (such as 0.22μm for viruses and 0.45μm for bacteria), the operator can complete the sealed switching without tools, and the constant pressure characteristic of the cam mechanism ensures consistent clamping force for different batches of filter membranes. Experiments show that this design reduces the filter membrane breakage rate from 12% in traditional fixed mode to 0.3%, and the standard deviation of enrichment recovery rate is reduced to ±1.8% (n=30), significantly improving the reliability of pathogen detection. Through the deep integration of modular flow path and intelligent sensing, the whole machine realizes full-automatic closed-loop control from rising to microorganism enrichment, providing key technical support for water quality safety monitoring.

[0207] Through the description of the above implementation manners, those skilled in the art can clearly understand that the above embodiments can be implemented by software, or can be implemented by means of software plus necessary general hardware platforms. Based on such 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 (which can be a CD-ROM, a U disk, a mobile hard disk, etc.), and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present application.

[0208] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A filter disc device with integrated quick-change filter membrane, characterized in that The filter disc device, used in the original microbial enrichment instrument, includes: 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: A sealing ring (13) is embedded below the upper part (1) of the filter disc and above the lower part (2) of the filter disc. 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).

2. The filter disc device of claim 1, wherein, 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).

3. The filter disc device of claim 2, wherein, 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. 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.

4. The filter disc device of claim 3, wherein the filter disc device is configured to be used as a filter disc device for a filter cartridge. The filter disc device further comprises a plurality of positioning screws (11) arranged for connecting the filter disc with other equipment; the positioning screw (11) is a stepped shaft type composite structure, comprising a threaded locking section, a precise positioning section and a driving bearing section, the positioning screw (11) is connected with other equipment through a three-way positioning mechanism and a flexible locking mechanism in sequence, the three-way positioning mechanism corresponds to stages including an initial positioning stage, a precise centering stage and a working condition self-adapting stage; in the initial positioning stage, the filter disc device is suspended above a flange of the other equipment by a hoisting tool, the positioning screw (11) is pre-inserted into a hinge hole uniformly distributed around the filter disc device, at this time, the precise positioning section is in a guide fit with the hole wall of the hinge hole, and the positioning screw (11) is manually rotated to realize a preliminary leveling of the filter disc device with a flatness error of ≤0.1mm / m; in the precise centering stage, when the threaded section of the positioning screw (11) contacts a threaded hole of the flange, a torque wrench is used to tighten in three stages, the three tightening stages are 30% target torque, 60% target torque and 100% target torque, in this process, the precise positioning section is radially constrained with the hinge hole to eliminate transverse displacement caused by equipment vibration; an end surface of the flange and a supporting surface of the filter disc device generate a normal compression force through an axial tension of the positioning screw (11); a conical screw head of the positioning screw (11) and a counterbore form an angular positioning to inhibit rotation of the filter disc device around the Z axis; in the working condition self-adapting stage, a small gap of the precise positioning section allows the filter disc device to expand due to heat to avoid thermal stress concentration, while bearing a vibration with a small amplitude; The flexible locking mechanism comprises: in the flange sealing groove area, the positioning screw (11) away from the sealing ring is set to bear the main positioning function, and the positioning screw (11) close to the sealing ring is set to reduce the pre-tightening force, thereby forming a functional synergy with the sealing element.

5. Application of the filter disc device with an integrated and quickly replaceable filter membrane according to claims 1-4 in the original microorganism enrichment instrument, the original microorganism enrichment instrument comprising: a power and flow path control system composed of a peristaltic pump (1'), a water pipe distributor (4') and an electromagnetic valve (1'2'); a microorganism enrichment core module composed of the filter disc device (3') according to any one of claims 1-4 and a filter bag (5'); a sensing and feedback system composed of a liquid level sensor (10'), a pressure sensor (11'), a photoelectric sensor (13') and a flow sensor (14'); a control and output hub composed of a mainboard and controller (8'), a liquid crystal screen (7') and a printer (6'); and an auxiliary function module composed of a pretreatment storage (9') and a machine shell (2').

6. The filter disc device of claim 5, wherein the filter disc is integrally formed with the filter disc device. The power and flow path control system, the peristaltic pump (1') is fixed on the shockproof support of the left inner wall of the cabinet (2'), the inlet of the peristaltic pump (1') is directly connected with the bottom outlet of the pretreatment reservoir (9'); the peristaltic pump (1') is connected with the PWM control port of the mainboard and controller (8') through the stepping motor driver, the outlet of the peristaltic pump (1') is connected with the central input port of the water pipe distributor (4') through the silica gel hose; The water pipe distributor (4') is located on the upper platform in the middle of the cabinet (2'), and the filter disc device (3') is located directly below; the water pipe distributor (4') comprises an input port and three output ports, wherein the input port receives the output flow path of the peristaltic pump (1'), the three output ports are respectively a main output port, a bypass return port and a cleaning liquid interface, the main output port is connected with the water inlet nozzle of the filter disc device (3') vertically downward; the bypass return port returns to the pretreatment reservoir (9') through the electromagnetic valve (12'); the cleaning liquid interface is connected with a disinfectant storage tank; The electromagnetic valve (12') is integrated in the bypass outlet end of the water pipe distributor (4'), the valve body of the electromagnetic valve (12') is embedded in the aluminum alloy heat dissipation base of the water pipe distributor (4'), the electromagnetic valve (12') is connected with the relay module of the mainboard and controller (8') through the coil driving wire, the pressure sensor (11') is installed before the electromagnetic valve (12'), and the pipeline behind the electromagnetic valve (12') returns to the pretreatment reservoir (9'); The peristaltic pump (1') adopts a three-roller high-precision extrusion structure and a pulse conveying mode, the pump head pressure of the peristaltic pump (1') can be adjusted in the range of 0.1-0.5MPa, and a PTFE coating is embedded in the hose channel to resist biofilm adhesion; the main body of the water pipe distributor (4') is a stainless steel three-dimensional flow channel block, the inner wall is electrolytic polished, and a gentle bend with a curvature radius of ≥5D is adopted at the flow channel turning point to suppress turbulent flow; the electromagnetic valve (12') is a normally closed diaphragm valve, the electromagnetic valve (12') has a conical valve seat, which is used to form a Venturi effect when the electromagnetic valve (12') is opened, to accelerate the bypass return flow to prevent particle deposition.

7. The filter disc device of claim 6, wherein the filter disc device is integrally formed. In the microbial enrichment core module, the filter disc device (3') is located in the central operation area of the cabinet (2'), and is fixed on the stainless steel supporting platform at the bottom of the cabinet (2') through a quick release buckle; the filter disc device (3') comprises a water inlet nozzle, a filtrate outlet and an electrical signal interface, wherein the water inlet nozzle receives the main output flow path of the water pipe distributor (4'), the filtrate outlet is connected with the input port of the filter bag (5') through an L-shaped conduit; the electrical signal interface is used to connect the emitting end of the photoelectric sensor (13'); the filter bag (5') is located below the right side of the filter disc device (3') and is inserted into a special constant temperature card slot, the input port of the filter bag (5') receives the filtrate of the filter disc (3'), and the output port of the filter bag (5') is connected with a waste liquid tank through the flow sensor (14'); The filter disc device (3') adopts a cam-claw mechanism with a knob lock to obtain or release the filter membrane clamping force; the filter bag (5') has a multi-layer composite membrane structure, which includes a three-dimensional corrugated structure formed by a pre-filter layer, a main enrichment layer and a support layer, the pre-filter layer is a 50μm nylon net for intercepting large particles, the main enrichment layer is a 0.45μm mixed cellulose ester membrane for retaining microorganisms, and the support layer is a polypropylene non-woven fabric for resisting hydraulic impact.

8. The filter disc device of claim 7, wherein the filter disc device is integrally formed. In the sensing and feedback system, the liquid level sensor (10') is arranged on the inner wall top of the pretreatment storage (9'), the probe extends to a certain height away from the tank, and the I2C bus is directly connected to the ADC acquisition module of the mainboard and controller (8'); the pressure sensor (11') is embedded in the side wall of the water inlet channel of the filter disc device (3'), the sensing surface is flush with the flow channel, and the Wheatstone bridge output is connected to the differential amplification circuit of the mainboard and controller (8'); the photoelectric sensor (13') is connected across the transparent observation window of the filter disc device (3'), and the infrared emission / receiving unit is connected to the optical detection interface of the mainboard and controller (8') respectively; the photoelectric sensor (13') has a dual-wavelength detection system of 850nm and 1300nm, the 850nm channel monitors bubbles, and the 1300nm channel identifies the turbidity change of the filter membrane; the flow sensor (14') is arranged in the middle of the straight pipe section of the outlet pipeline of the filter bag (5'), and the pulse output signal is connected to the counter port of the mainboard and controller (8'); The liquid level sensor (10') is a capacitive non-contact sensor, and the titanium alloy probe surface is coated with a Parylene C coating to resist protein adsorption; the pressure sensor (11') is formed by laser welding of a MEMS piezoresistive chip and a 316L stainless steel isolation diaphragm, which is used to monitor the pressure when the filter membrane is blocked and the pressure is greater than 0.4MPa to trigger the automatic backwashing program; the flow sensor (14') adopts a turbine type metering structure.

9. The filter disc device of claim 8, wherein, In the control and output hub, the mainboard and controller (8') are located in the sealed cabin at the rear of the machine shell (2'), and are attached to the aluminum alloy heat dissipation shell of the machine shell (2') through a heat-conducting silicone pad; the mainboard and controller (8') include an STM32H743 master control chip for processing sensor data, an FPGA logic unit for generating a peristaltic pump (1') control waveform, an RS485 bus for connecting a liquid crystal screen (7') and a printer (6'), and an isolated CAN interface for connecting a temperature control module of a pretreatment storage (9'); the liquid crystal screen (7') is arranged in the center of the operation panel of the machine shell (2') inclined by 30°, and is connected to the graphics accelerator of the mainboard and controller (8') through an LVDS interface; the printer (6') is arranged in a special chute at the lower right side of the machine shell (2'), and is connected to the mainboard and controller (8') through a thermal printing interface.

10. The filter disc device of claim 9, wherein the filter disc device is configured to be used in a filter disc device system comprising a filter disc device and a filter disc device holder. In the auxiliary function module, the pretreatment storage (9') is located in the left pullable cabin of the cabinet (2'), the inlet of the pretreatment storage (9') is connected with a sampling tube, the bottom outlet is connected with the peristaltic pump (1'), the top air inlet is connected with the sterilization filter of the filter bag (5'), the pretreatment storage (9') is a borosilicate glass jar body, the outside is coated with a metal wire mesh explosion-proof cover, the inside is provided with a magnetic stirring module and a peltier temperature control system; the inside of the cabinet (2') includes multiple modular cabins, which are a left power cabin, a central enrichment cabin, a right control cabin and a top flow path layer; wherein the left power cabin is used for accommodating the peristaltic pump (1') and the pretreatment storage (9'), the central enrichment cabin is used for installing the filter disc device (3') and the filter bag (5'), the right control cabin is used for integrating the mainboard and the controller (8') and the power module, and the top flow path layer is used for arranging the water pipe distributor (4') and the sensing and feedback system.

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