Double-filter-element filtering mechanism

Abstract

The utility model discloses a double-filter-element filtering mechanism, and belongs to the field of liquid filtering. According to the technical scheme, the double-filter-element filtering mechanism comprises a filtering seat, a first filter element connector and a second filter element connector are detachably connected to the filtering seat, a water inlet and a water outlet are formed in the filtering seat, and the first filter element connector and the second filter element connector are detachably connected to the filtering seat. The first filter element interface comprises a first interface communicated with the water inlet and a second interface communicated with the water outlet, the second filter element interface comprises a third interface communicated with the water inlet and a fourth interface communicated with the water outlet, and further comprises a ball valve arranged among the first interface, the third interface and the water inlet; according to the utility model, the communication or simultaneous communication of the water inlet and different filter element interfaces is realized through the switching of the ball valve at three positions, the switching of the filter elements or the simultaneous work of the double filter elements can be completed without shutdown, the problems that the shutdown is still needed and the structure is complicated during the switching of the traditional double filter element system are solved, and the filter element system has the advantages of continuous filtration, convenience in operation and high reliability.

Description

Technical Field

[0001] This utility model belongs to the field of liquid filtration, specifically relating to a dual-filter mechanism. Background Technology

[0002] In industrial production, water treatment, and food and pharmaceutical fields, liquid filtration systems are core equipment for ensuring process stability and product quality. Traditional filtration devices generally use a single filter cartridge structure. The core problem with this is that filter cartridge replacement requires system shutdown, leading to production interruptions, significant economic losses, and efficiency bottlenecks. Specifically, when the filter cartridge becomes clogged or reaches the end of its service life, the system must be completely shut down to remove the old cartridge and install a new one. This process is not only time-consuming and labor-intensive, but frequent start-ups and shutdowns can also accelerate pipeline aging and increase maintenance costs.

[0003] To address the downtime issue of single-element filter systems, existing technologies have proposed a dual-element parallel structure, using valves to switch the filters alternately. However, this design still suffers from the following key drawbacks:

[0004] Downtime risks are not fundamentally eliminated: Most dual-filter systems only support a single-filter working mode. When switching filters, a short shutdown is still required to operate valves or disassemble parts, making true "seamless switching" impossible.

[0005] The switching mechanism is complex and inefficient: the existing solution relies on the combination of multiple independent valves (such as solenoid valves and gate valves) to control the water flow path. The large number of valves and the intertwined pipelines not only increase the risk of leakage, but also cause the switching time to be time-consuming due to the cumbersome operation steps, making it difficult to cope with high-frequency filtration scenarios.

[0006] Insufficient functional scalability: Traditional dual-filter systems cannot support the simultaneous operation of both filters (such as to meet high flow rate requirements), and lack the flexibility of independent filter maintenance. Replacing a single filter still requires a complete system shutdown.

[0007] Reliability risks: After valve switching, there is a lack of a stable limit and locking mechanism, which can easily cause the water flow path to deviate unexpectedly due to vibration or misoperation, leading to filter failure or abnormal system pressure.

[0008] The current industrial landscape urgently demands continuous and intelligent production, creating a need for a dual-filter mechanism that can completely eliminate the pain point of downtime for filter replacement and supports flexible switching between multiple modes. This mechanism must achieve rapid switching with simplified control logic while ensuring sealing and operational safety, thereby providing reliable protection for high-load, long-cycle industrial systems. Utility Model Content

[0009] This invention provides a dual-filter mechanism to solve at least one of the above-mentioned technical problems.

[0010] The technical solution adopted in this utility model is as follows:

[0011] A dual-filter mechanism includes a filter base with a first filter element interface and a second filter element interface detachably connected to it. The filter base has an inlet and a outlet. The first filter element interface includes a first interface communicating with the inlet and a second interface communicating with the outlet. The second filter element interface includes a third interface communicating with the inlet and a fourth interface communicating with the outlet. The mechanism also includes a ball valve disposed between the first interface, the third interface, and the inlet. The ball valve can be rotated to have a first position that connects the inlet, the first interface, and the third interface simultaneously, a second position that connects only the inlet and the first interface, and a third position that connects only the inlet and the third interface.

[0012] Furthermore, this application also proposes that a rotating shaft that penetrates the outer shell of the filter seat is fixedly connected to the center of the ball valve shaft, the rotating shaft is sealed and rotatably connected to the filter seat, and a rotating wrench is provided at one end of the rotating shaft located outside the filter seat.

[0013] Furthermore, this application also proposes that the wrench is connected to the rotating shaft via a bushing, the bottom of the bushing is provided with a limiting plate, the limiting plate is symmetrically provided with limiting slots, and the filter seat is detachably connected with a first limiting bolt and a second limiting bolt that cooperate with the limiting slots.

[0014] Furthermore, this application also proposes that a third limiting bolt is detachably connected to the filter seat, and a chain for fixing the wrench is connected to the first or second limiting bolt and the third limiting bolt.

[0015] Furthermore, this application also proposes that a first filter element is detachably connected to the first filter element interface. The first filter element includes a housing and a first connection port and a second connection port disposed at the end of the housing. The first connection port cooperates with the first interface, and the second connection port cooperates with the second interface. A filter element is disposed inside the housing, and the liquid to be filtered passes through the first interface, the first connection port, the filter element, the second connection port, and the second interface in sequence.

[0016] Furthermore, this application also proposes that a second filter element is detachably connected to the second filter element interface. The second filter element includes a housing and a second connection port disposed at the end of the housing. The second connection port cooperates with the third interface and the second connection port cooperates with the fourth interface. A filter element is disposed inside the housing. The liquid to be filtered passes through the third interface, the second connection port, the filter element, the second connection port, and the fourth interface in sequence.

[0017] Furthermore, this application also proposes that the inlet is provided with a first connecting flange and the outlet is provided with a second connecting flange.

[0018] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows:

[0019] 1. When the ball valve is in the first position, water flows into both the first and second filter elements simultaneously. The filtered liquid flows into the drain outlet through the second and fourth ports, respectively, enabling the dual filter elements to operate in parallel. When the first filter element needs to be replaced, rotate the ball valve to the third position to cut off the water supply to the first filter element. At this point, the water flows only through the second filter element, allowing the operator to remove and replace the first filter element. Similarly, rotating it to the second position allows the first filter element to be used alone. The rotation angle of the ball valve is fixed by a limiting mechanism to ensure that the flow channel accurately corresponds to the target operating mode after each switch.

[0020] Switching between three operating modes is achieved using a single three-way ball valve, reducing the number of valves and pipeline connection points. Existing technology requires closing the main inlet valve when switching filter cartridges, while this solution directly cuts off the water inlet path to the target filter cartridge using the ball valve, without interrupting the overall system operation. Furthermore, the mechanical limit design of the ball valve avoids the risk of circuit failure in the solenoid valve control system.

[0021] Through the above technical solution, this application can complete the filter element switching without interrupting the filtration operation, and the switching operation time is shortened from 2-5 minutes in the traditional solution to within 10 seconds.

[0022] 2. The rotating shaft passes through the filter housing and is rigidly connected to the ball valve. When the turn wrench is operated, the rotating shaft drives the ball valve to rotate around its axis, thereby changing the connection state between the water inlet and the filter element interface.

[0023] When the ball valve reaches the preset position, the limit latch engages with the corresponding bolt. The bolt head blocks the latch, restricting the shaft from continuing to rotate, thus achieving accurate positioning of the ball valve in three working positions.

[0024] By using a limit plate and bolts, mechanical locking is automatically triggered when the ball valve reaches each working position, eliminating human error. Furthermore, the complex multi-valve linkage structure in existing technologies is simplified into a single rotary shaft limit system, reducing leakage risk and shortening switching operation time.

[0025] 3. One end of the chain is fixed to the aligned limit bolt, and the other end is fixed to the third limit bolt, forming a triangular constraint structure spanning the wrench and the two limit bolts. This structure uses the rigid tension of the chain to counteract the torsional force caused by external vibration or misoperation, keeping the wrench stable. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model;

[0027] Figure 2 This is a front view of a specific embodiment of the present utility model;

[0028] Figure 3This is a cross-sectional view of the top view of the filter seat in this utility model;

[0029] Figure 4 This is a top view of the filter base in this utility model;

[0030] Figure 5 This is a top view of a specific embodiment of the present utility model.

[0031] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0032] In the attached diagram:

[0033] 1. Filter base; 2. Inlet; 21. First connecting flange; 3. Drain outlet; 31. Second connecting flange; 4. First filter element; 41. First interface; 42. Second interface; 5. Second filter element; 51. Third interface; 52. Fourth interface; 6. Ball valve; 60. Shaft; 61. Wrench; 62. Limiting plate; 621. Limiting bayonet; 63. First limiting bolt; 631. Second limiting bolt; 64. Chain. Detailed Implementation

[0034] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0036] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] Reference Figures 1-5 This application proposes a dual-filter mechanism, including a filter base 1, on which a first filter element interface and a second filter element interface are detachably connected, as well as an inlet 2 and a drain 3. The first filter element interface includes a first interface 41 connecting to the inlet 2 and a second interface 42 connecting to the drain 3. The second filter element interface includes a third interface 51 connecting to the inlet 2 and a fourth interface 52 connecting to the drain 3. A ball valve 6 is disposed between the first interface 41, the third interface 51, and the inlet 2, and can be switched to three working positions by rotation: a first position that simultaneously connects the inlet 2 to both filter element interfaces, a second position that only connects the inlet 2 to the first filter element interface, and a third position that only connects the inlet 2 to the second filter element interface.

[0040] The filter base 1 is the main structure that supports the filter element interface and fluid channels. It can be made of cast aluminum alloy or engineering plastic and has internally isolated fluid channels to support the filter element interface and distribute water flow paths. Detachable connection refers to the connection between the filter element interface and the filter element via threads, snaps, or flanges. A quick-release flange structure can be used for easy replacement and maintenance of the filter element. The ball valve 6 is a rotary valve with L-shaped or T-shaped flow channels. A three-way ball valve 6 made of stainless steel can be used, allowing for switching between different flow channel combinations by rotating 90 degrees, enabling single-valve control of multiple water flows. The first position refers to the state where the ball valve 6 flow channel simultaneously connects to inlet 2, first interface 41, and third interface 51. In this position, the two filter elements can work in parallel, suitable for high-flow-rate applications. The second position refers to the state where the ball valve 6 flow channel only connects to inlet 2 and first interface 41. In this position, only the first filter element is working, and the second filter element can be maintained or replaced. The third position refers to the state where the flow channel of ball valve 6 is only connected to the inlet 2 and the third interface 51. At this time, only the second filter element is in working condition, and the first filter element can be maintained or replaced.

[0041] Specifically, when ball valve 6 is in the first position, water from inlet 2 simultaneously enters both the first and second filter elements. The filtered liquid flows into drain 3 through second port 42 and fourth port 52, respectively, enabling the dual filter elements to operate in parallel. When the first filter element needs to be replaced, ball valve 6 is rotated to the third position to cut off the water supply to the first filter element. At this time, the water flows only through the second filter element, allowing the operator to remove and replace the first filter element. Similarly, rotating to the second position allows the first filter element to be used alone. The rotation angle of ball valve 6 is fixed by a limiting mechanism to ensure that the flow channel accurately corresponds to the target operating mode after each switch.

[0042] Compared to existing technologies, traditional dual-filter systems require at least two independent valves to control the water inlet of each filter cartridge. This solution, however, uses a single three-way ball valve 6 to switch between three operating modes, reducing the number of valves and piping connection points. Existing technologies require closing the main inlet valve when switching filter cartridges, while this solution directly cuts off the water inlet path of the target filter cartridge using ball valve 6, without interrupting the overall system operation. Furthermore, the mechanical limit design of ball valve 6 avoids the risk of circuit failure in the solenoid valve control system.

[0043] Through the above technical solution, this application can complete the filter element switching without interrupting the filtration operation, reducing the switching time from 2-5 minutes in the traditional method to within 10 seconds. After a single ball valve 6 replaces multiple independent valves, pipeline leakage points are reduced by more than 50%, and the system failure rate is significantly reduced. On food processing production lines, when online monitoring shows that the pressure differential of the first filter element exceeds the standard, the operator can directly rotate the ball valve 6 to switch to the second filter element operating state. The entire switching process does not require machine shutdown, ensuring continuous production requirements.

[0044] This application further proposes that a rotating shaft 60 is fixedly connected at the center of the ball valve 6, which penetrates the outer shell of the filter seat 1. The rotating shaft 60 is sealed and rotatably connected to the filter seat 1, and a rotating wrench 61 is provided at one end of the rotating shaft 60 located outside the filter seat 1.

[0045] The rotating shaft 60 refers to the transmission component connecting the ball valve 6 and external operating parts. It can be made of metal and fixed to the ball valve 6 shaft by welding or keyway, transmitting rotational torque to achieve position switching of the ball valve 6. This structure enables mechanical linkage between the ball valve 6 control and external operation, avoiding the complexity of traditional solenoid valves that rely on circuit control.

[0046] The sealing and rotating connection refers to the dynamic sealing structure between the rotating shaft 60 and the filter seat 1, which can be achieved using rubber sealing rings or PTFE bearings. This design ensures the free rotation of the rotating shaft 60 while preventing liquid leakage. This design solves the leakage risk caused by too many sealing points in traditional multi-valve switching systems.

[0047] The rotary wrench 61 is an operating component used to manually drive the rotating shaft 60 to rotate. It can be made of injection-molded plastic or metal casting and is fixed to the end of the rotating shaft 60 by threads or snap-fit. The surface of the wrench 61 can be provided with anti-slip texture to enhance the ease of operation, and its external design allows operation without disassembling the filter mechanism housing.

[0048] Specifically, the rotating shaft 60 passes through the outer shell of the filter housing 1 and is rigidly connected to the ball valve 6. When the rotary wrench 61 is operated, the rotating shaft 60 drives the ball valve 6 to rotate around its axis, thereby changing the connection state between the inlet 2 and the filter element interface. The sealing structure forms a pressure-adaptive sealing layer at the contact surface between the rotating shaft 60 and the outer shell, allowing the rotating shaft 60 to rotate with low resistance while withstanding liquid permeation under the system's operating pressure. The length and shape of the rotary wrench 61 can be adjusted according to the operating space requirements, for example, using an L-shaped handle to increase torque, or a folding design to adapt to confined installation environments.

[0049] Compared to existing technologies, traditional dual-filter systems rely on independent solenoid valves or manual valves to control the water flow path, requiring sequential operation between multiple valves, resulting in complex operation and numerous sealing points. This solution, however, directly links the movement of the ball valve 6 via a single rotating shaft 60, simplifying the switching action to a single rotary operation. This also reduces the number of sealing interfaces, significantly lowering the probability of leakage and maintenance costs.

[0050] Through the above technical solution, this application achieves intuitive and rapid switching operation of ball valve 6. Operators can switch the filter element's working mode without professional tools, and the system operation can be maintained without interruption during the switching process. The design of the combination between the rotating shaft 60 and the sealing structure effectively eliminates the leakage risks of traditional multi-valve systems, ensuring the operational stability of the filtration mechanism under long-term vibration conditions.

[0051] This application further proposes that the wrench 61 is connected to the rotating shaft 60 through a bushing, and the bottom of the bushing is provided with a limiting plate 62. The limiting plate 62 is symmetrically provided with limiting slots 621. The filter seat 1 is detachably connected to a first limiting bolt 63 and a second limiting bolt 631 that cooperate with the limiting slots 621.

[0052] Among them, the bushing refers to the sleeve component used to connect the wrench 61 and the rotating shaft 60, which can be implemented by a metal sleeve with internal threads. Its function is to transmit torque and maintain operational stability. The limiting plate 62 refers to the plate-like structure fixed to the bottom of the bushing, which can be implemented by a circular metal plate with symmetrical bayonets. The bayonets and bolts cooperate to achieve mechanical limiting. The limiting bayonets 621 refers to the groove structure set on the edge of the limiting plate 62, which can be implemented by an arc or rectangular notch, and is used to constrain the rotation angle of the rotating shaft 60. The first limiting bolt 63 and the second limiting bolt 631 are threaded fasteners fixed on the filter seat 1, which can be implemented by a metal bolt with external threads. By screwing into the corresponding threaded hole of the filter seat 1 and engaging with the limiting bayonets 621, the rotation position of the rotating shaft 60 is locked.

[0053] Specifically, when the operating wrench 61 switches the position of the ball valve 6, the rotating shaft 60 drives the bushing and the limiting plate 62 to rotate synchronously. The limiting latch 621 contacts the first limiting bolt 63 or the second limiting bolt 631 along the rotation trajectory. When the ball valve 6 reaches the preset position, the limiting latch 621 engages with the corresponding bolt, and the bolt head blocks the latch, restricting the rotating shaft 60 from continuing to rotate, thereby achieving accurate positioning of the ball valve 6 in three working positions. For example, when the ball valve 6 is switched to the first position, the limiting slot 621 engages with the first limiting bolt 63 and the second limiting bolt 631 simultaneously, and at this time the water inlet 2 is connected to both filter cartridge interfaces simultaneously. When it is necessary to switch to the second position, the first limiting bolt 63 needs to be removed and the wrench 61 needs to be turned until the slot adjacent to the second limiting bolt 631 engages with the second limiting bolt 631 to complete the positioning. Similarly, when it is necessary to switch to the third position, the second limiting bolt 631 needs to be removed and the wrench 61 needs to be turned until the slot adjacent to the first limiting bolt 63 engages with the first limiting bolt 63 to complete the positioning.

[0054] Compared to existing technologies, traditional switching mechanisms rely heavily on operator experience to judge valve positions, and the lack of physical limits leads to a higher risk of switching errors. This solution, however, uses a limit plate 62 and bolts to automatically trigger mechanical locking when the ball valve 6 reaches each working position, eliminating human error. Furthermore, the complex multi-valve linkage structure of existing technologies is simplified into a single rotating shaft 60 limit system, reducing leakage risk and shortening switching operation time.

[0055] Through the above technical solution, this application effectively solves the problem of position displacement caused by vibration or misoperation after the ball valve 6 is switched, ensuring the stability of the water flow path; at the same time, through the detachable bolt design, the position of the limit point can be adjusted according to the actual working conditions to adapt to the installation requirements of different filter element interfaces, and the bolts can be replaced individually after wear, reducing maintenance costs.

[0056] This application further proposes that a third limiting bolt is detachably connected to the filter seat 1, and a chain 64 for fixing the wrench 61 is connected to the first limiting bolt 63 or the second limiting bolt 631 and the third limiting bolt.

[0057] The third limiting bolt is a fastener located outside the filter seat 1 and spatially positioned with the first or second limiting bolt 631. It can be a threaded metal rod, screwed into a pre-drilled threaded hole in the filter seat 1 to form a fixed fulcrum. The chain 64 is a flexible connector formed by a series of metal rings, specifically made of stainless steel ring links. Both ends are connected to the limiting bolts and the wrench 61 via buckles, forming a physical constraint. The cooperation between the limiting bolts and the chain 64 restricts the wrench 61's freedom of movement outside its designated position.

[0058] Specifically, when the ball valve 6 is switched to the first, second, or third position, rotating the wrench 61 causes the shaft 60 to rotate to the corresponding angle. At this time, the limiting jaw 621 aligns with the first limiting bolt 63 or the second limiting bolt 631, achieving initial positioning. One end of the chain 64 is fixed to the aligned limiting bolt, and the other end is fixed to the third limiting bolt, forming a triangular constraint structure spanning the wrench 61 and the two limiting bolts. This structure uses the rigid tension of the chain 64 to counteract the torsional force caused by external vibration or misoperation, keeping the wrench 61 stable.

[0059] Compared to existing technologies, traditional dual-element filter mechanisms rely solely on single-point contact between the limiting bolt and the bayonet for positioning, lacking additional constraint mechanisms. This makes them prone to displacement when the equipment vibrates or is touched by humans. This solution adds a third limiting bolt and chain 64 to form a multi-point linkage locking structure, upgrading the original single linear constraint to a planar mechanical balance system, significantly improving the anti-interference capability of the operating components.

[0060] Through the above technical solution, this application effectively prevents the ball valve 6 from rotating unexpectedly due to external interference during operation, ensuring the stability of the water flow path switching state. The cooperation between the chain 64 and the multi-limit bolts eliminates the risk of mechanical loosening present in traditional single-point limiting, enabling operators to safely perform filter element switching or maintenance operations without interrupting the filtration process.

[0061] This application further proposes that a first filter element 4 is detachably connected to the first filter element interface. The first filter element 4 includes a housing and a first connection port and a second connection port disposed at the end of the housing. The first connection port cooperates with the first interface 41, and the second connection port cooperates with the second interface 42. A filter element is disposed inside the housing. The liquid to be filtered passes through the first interface 41, the first connection port, the filter element, the second connection port, and the second interface 42 in sequence.

[0062] The detachable connection refers to the separable fixing method between the first filter element 4 and the first filter element interface. This can be achieved through threaded connection, snap-locking, or quick-connect fitting, facilitating individual removal and replacement of the filter element. The outer shell refers to the rigid or semi-rigid container that encloses the filter element, and can be made of stainless steel, engineering plastics, or composite materials. It protects the internal filter element and forms a closed flow channel. The first and second connection ports refer to the fluid channel interfaces located at the ends of the outer shell. These can be flange structures with sealing rings or flange structures to ensure a sealed connection with the filter seat 1 interface. The filter element refers to the porous filter medium, which can be made of pleated filter paper, sintered ceramics, or activated carbon layers, used to intercept impurities or adsorb specific substances in the liquid.

[0063] Specifically, the first filter element 4 is sealed to the first interface 41 of the filter base 1 via a first connecting port at its end, while the second connecting port is connected to the second interface 42 of the filter base 1, forming a complete path for liquid to enter the first interface 41 from the inlet 2, flow through the filter element inside the housing for filtration, and then exit from the second interface 42. When the filter element needs to be replaced, it is only necessary to disconnect the connection between the first filter element 4 and the first filter element interface, disassemble it as a whole, replace it with a new filter element, and reinstall it, without interrupting the operation of the flow path where the second filter element interface is located.

[0064] Compared to existing technologies, current dual-filter systems still require disassembling and reassembling multiple pipe joints when replacing the filter element, which is complex and poses a risk of leakage. This solution, through a standardized interface design, simplifies filter element replacement to a single modular disassembly and assembly, significantly reducing operational complexity and maintenance time. Furthermore, the separate design of the filter element and interface in existing technologies can easily lead to seal failure, while the integrated structure of the filter element and housing in this solution ensures the integrity of the flow channel and avoids secondary contamination.

[0065] Through the above technical solution, this application achieves the technical effect of quick filter replacement without stopping the machine. The modular design simplifies the maintenance process and reduces the risk of seal failure caused by disassembly, ensuring that the filtration system can continue to operate stably during filter replacement.

[0066] This application further proposes that a second filter element 5 is detachably connected to the second filter element interface. The second filter element 5 includes a housing and a second connection port provided at the end of the housing. The second connection port cooperates with the third interface 51 and the second connection port cooperates with the fourth interface 52. A filter element is provided inside the housing. The liquid to be filtered passes through the third interface 51, the second connection port, the filter element, the second connection port, and the fourth interface 52 in sequence.

[0067] The second filter element interface refers to the port structure used to connect the second filter element 5. It can be installed detachably using a threaded connection or a snap-fit ​​structure, ensuring convenient filter element replacement. The outer shell refers to the container structure that houses the filter element. It can be made of pressure-resistant and corrosion-resistant engineering plastics or metal, and formed into a closed cavity through molding or welding processes. The second connection port refers to the fluid channel located at the end of the outer shell and matched with the filter seat 1 interface. It can achieve a sealed connection with the third interface 51 and the fourth interface 52 through a sealing ring or rubber gasket to prevent liquid leakage. The filter element refers to the filter medium installed inside the outer shell, which can be activated carbon, ceramic filter media, or polymer membrane materials, used to intercept impurity particles in the liquid.

[0068] Specifically, the second filter element 5 quickly connects to the third interface 51 and the fourth interface 52 on the filter base 1 via the second connection port, forming a complete filtration path from the inlet 2 to the outlet 3. The liquid to be filtered flows into the second filter element 5 through the third interface 51, sequentially enters the filter element through the second connection port to complete filtration, and is then discharged through the fourth interface 52 via another second connection port. The dual connection port layout at the end of the housing ensures unidirectional liquid flow, preventing a decrease in filtration efficiency due to backflow. The detachable connection between the second filter element 5 and the interface allows for individual disassembly, maintenance, or replacement without shutting down the system, while maintaining the normal operation of the first filter element 4.

[0069] Compared to existing technologies, traditional dual-filter systems typically employ a single connection port or asymmetrical interface design, requiring complete disassembly and interruption of water flow during filter replacement. This solution, through symmetrical dual connection ports, allows the second filter element 5 to be installed and removed independently while maintaining the operation of the other filter element. Existing technologies often rely on complex valve switching for filter interfaces, while this solution simplifies the connection structure through standardized interface design, reducing leakage risk and improving operational efficiency.

[0070] Through the above technical solution, this application achieves rapid replacement and independent maintenance of the second filter element 5, avoiding system downtime due to filter element blockage or failure. The integrated design of the dual connection ports and the housing ensures the stability of the liquid flow path and reduces sealing failure caused by interface misalignment. The symmetrical interface layout further supports the simultaneous operation of the two filter elements, meeting the needs of high-flow filtration, while retaining the selectivity of single-filter-element operation, improving system adaptability.

[0071] This application further proposes that the water inlet 2 of the dual-filter mechanism is provided with a first connecting flange 21 and the drain outlet 3 is provided with a second connecting flange 31.

[0072] The first connecting flange 21 refers to the annular disc-shaped connecting component installed at the end of the inlet 2. Specifically, it can be implemented using a metal flange with bolt holes and a sealing gasket. Tightening the bolts achieves a sealed connection between the inlet 2 and the external pipeline. The second connecting flange 31 refers to the same type of connecting structure installed at the end of the drain outlet 3. Its dimensions can be the same as the first connecting flange 21 or adjusted according to drainage flow requirements, for example, using a DN50 standard flange. The flange connection method provides a reliable sealing effect through evenly distributed bolt preload, while allowing for quick disassembly to connect to external pipelines or perform maintenance operations.

[0073] Specifically, when the filtration unit needs to connect to an external liquid supply system and downstream equipment, the first connecting flange 21 is connected to the inlet pipe flange via matching bolts to ensure no leakage of high-pressure water. The second connecting flange 31 at the drain outlet 3 is connected to the discharge pipe or storage container in the same manner, forming a complete filtration loop. When replacing the filter element or performing system maintenance, operators can loosen the flange bolts to disconnect the pipeline without damaging the original welded or threaded interfaces, significantly reducing maintenance complexity. The planar sealing structure of the flange connection can adapt to different pressure conditions, maintaining stable sealing performance within a working pressure range of 0.6-1.0 MPa.

[0074] Compared to existing technologies, traditional filter mechanisms often use threaded interfaces or direct welding to connect pipelines, which leads to difficulties in disassembly and easy wear of sealing surfaces. For example, threaded connections are prone to stripping after frequent disassembly and assembly, while welded interfaces require cutting equipment to separate the pipeline. The flange connection used in this solution not only improves disassembly and assembly efficiency but also extends the service life of the interface through a replaceable sealing gasket design, preventing the entire filter base 1 from being scrapped due to interface damage.

[0075] Through the above technical solution, this application effectively solves the problems of sealing reliability and maintenance convenience when connecting the filter mechanism to external pipelines. The flange connection method prevents liquid leakage under high pressure conditions, ensuring continuous operation of the filtration system; at the same time, the standardized interface design simplifies the equipment installation process. For example, when replacing the filter element, the operator only needs to remove the flange bolts to separate the pipeline, without special tools or complicated operating procedures, significantly shortening downtime for maintenance.

[0076] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0077] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0078] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A dual-filter mechanism, characterized in that, The filter includes a filter base (1), on which a first filter element interface and a second filter element interface are detachably connected. The filter base (1) is provided with an inlet (2) and a drain (3). The first filter element interface includes a first interface (41) connected to the inlet (2) and a second interface (42) connected to the drain (3). The second filter element interface includes a third interface (51) connected to the inlet (2) and a fourth interface (52) connected to the drain (3). The filter also includes a ball valve (6) disposed between the first interface (41), the third interface (51), and the inlet (2). The ball valve (6) rotates to have a first position that connects the inlet (2), the first interface (41), and the third interface (51) simultaneously, a second position that connects only the inlet (2) and the first interface (41), and a third position that connects only the inlet (2) and the third interface (51).

2. The dual-filter mechanism according to claim 1, characterized in that, The ball valve (6) has a fixed shaft (60) that passes through the outer shell of the filter seat (1). The shaft (60) is sealed and rotatably connected to the filter seat (1). A rotating wrench (61) is provided at one end of the shaft (60) located outside the filter seat (1).

3. The dual-filter mechanism according to claim 2, characterized in that, The wrench (61) is connected to the rotating shaft (60) through a bushing. The bottom of the bushing is provided with a limiting plate (62). The limiting plate (62) has symmetrically opened limiting slots (621). The filter seat (1) is detachably connected with a first limiting bolt (63) and a second limiting bolt (631) that cooperate with the limiting slots (621).

4. The dual-filter mechanism according to claim 3, characterized in that, The filter seat (1) is detachably connected to a third limiting bolt, and the first limiting bolt (63) or the second limiting bolt (631) is connected to the third limiting bolt by a chain (64) for fixing the wrench (61).

5. A dual-filter mechanism according to claim 3, characterized in that, The first filter element (4) is detachably connected to the first filter element interface. The first filter element (4) includes a housing and a first connection port and a second connection port provided at the end of the housing. The first connection port cooperates with the first interface (41), and the second connection port cooperates with the second interface (42). The housing is provided with a filter element. The liquid to be filtered passes through the first interface (41), the first connection port, the filter element, the second connection port, and the second interface (42) in sequence.

6. A dual-filter mechanism according to claim 5, characterized in that, The second filter element (5) is detachably connected to the second filter element interface. The second filter element (5) includes a housing and a second connection port provided at the end of the housing. The second connection port cooperates with the third interface (51) and the second connection port cooperates with the fourth interface (52). The housing is provided with a filter element. The liquid to be filtered passes through the third interface (51), the second connection port, the filter element, the second connection port, and the fourth interface (52) in sequence.

7. A dual-filter mechanism according to any one of claims 1-6, characterized in that, The inlet (2) is provided with a first connecting flange (21), and the outlet (3) is provided with a second connecting flange (31).

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