Foldable outdoor water purifying filter core with wear resistance and pressure resistance

Abstract

The application relates to the technical field of water purification equipment, and discloses a wear-resistant and pressure-resistant folding outdoor water purification filter core which comprises upper and lower end covers, a flow guide outer cover assembly, a folding filter membrane assembly and a self-adaptive throttling central pipe assembly which are coaxially and limitingly sleeved from outside to inside. The flow guide outer cover assembly is provided with a tangential water inlet chute and spiral guide ribs, raw water forms a cyclone, sand is removed by centrifugal force and discharged from the lower end, and sand particles are prevented from wearing the filter membrane. The folding filter membrane assembly is tightly embedded with a rigid wave support net which is conformal inside and outside, can resist water pressure extrusion and prevent the filter membrane from generating dead folds. The self-adaptive throttling central pipe assembly is provided with inner and outer pipes and a force receiving push piece. When instantaneous high pressure impact occurs, the water flow torque drives the inner pipe to overcome the spring resistance and self-rotate, the water passing holes of the inner and outer pipes are staggered, the through flow area is instantaneously reduced, and protective back pressure is generated. The application realizes pure physical cyclone wear resistance and water pressure self-adaptive dynamic protection, and prolongs the service life and safety of the filter core under outdoor harsh water quality.

Description

Technical Field

[0001] This invention relates to the field of water purification equipment technology, and in particular to a wear-resistant and pressure-resistant pleated outdoor water purification filter cartridge. Background Technology

[0002] With the increasing frequency of outdoor adventures, wilderness rescues, and emergency survival activities, portable outdoor water purification devices have become important tools for ensuring drinking water safety. Among them, pleated water filter cartridges are widely used in the market because they can provide a large surface area within a limited volume, thus ensuring sufficient water purification flow.

[0003] Outdoor natural water sources are typically extremely complex and harsh, often containing large amounts of hard particles such as silt and sand. In conventional pleated filter cartridges, the raw water often directly impacts and penetrates the core filtration area during operation. This results in sharp sand particles in the water directly rubbing and cutting against the fragile microfiltration or ultrafiltration membrane surface. Long-term purely mechanical wear severely damages the pore structure of the membrane, causing premature failure and shortening the filter cartridge's lifespan in harsh environments.

[0004] Existing filter structures also reveal significant limitations when dealing with changes in water pressure. When subjected to continuous external radial water pressure, the pleated membrane, due to insufficient rigidity and lack of a proper two-way physical framework, is prone to inward collapse and deformation at its crests and troughs, causing adjacent pleated membrane surfaces to tightly adhere together, forming dead folds. This phenomenon not only obstructs water flow channels but also drastically reduces the effective filtration area of ​​the filter, making water intake extremely difficult. More critically, when users operate a manual booster pump with excessive force, or when the filter is connected to a water supply line with instantaneous high-pressure water flow, the existing fixed central framework structure cannot dynamically throttle and depressurize the water flow. This forces the fragile membrane to bear the entire instantaneous, enormous impact force alone, easily leading to localized rupture or tearing. Once the membrane structurally ruptures, outdoor raw water containing a large number of pathogens will directly mix into the purified water supply, posing a significant health risk to the user.

[0005] Therefore, there is an urgent need in this field for a new type of outdoor water purification filter structure that can effectively separate sediment to prevent physical wear, provide strong structural support to prevent filter membrane from being squeezed and folded, and have adaptive interception and pressure resistance protection capabilities when facing instantaneous high pressure impact. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a wear-resistant and pressure-resistant pleated outdoor water purification filter element. This solves the problem that when the existing outdoor water purification filter element is used in harsh environments, the filter membrane is easily cut and worn by the mud and sand carried in the raw water, and is easily squeezed and pleated or even torn by overpressure when subjected to high water pressure or instantaneous water flow impact.

[0007] This invention is achieved through the following technical solution: A wear-resistant and pressure-resistant pleated outdoor water purifier cartridge includes an upper end cap, a lower end cap, and an adaptive throttling central tube assembly. The adaptive throttling central tube assembly has an axially extending central water flow channel inside. A water passage hole communicating with the external environment and the central water flow channel is formed on the tube wall of the adaptive throttling central tube assembly. A pleated filter membrane assembly is coaxially sleeved on the outer periphery of the adaptive throttling central tube assembly. A flow guide outer cover assembly is coaxially sleeved on the outer periphery of the pleated filter membrane assembly. An inlet channel for external raw water is formed on the wall of the flow guide outer cover assembly. The upper and lower ends of the pleated filter membrane assembly are respectively sealed to the upper and lower end caps. The adaptive throttling central tube assembly and the flow guide outer cover assembly are respectively constrained and assembled between the upper and lower end caps. A purified water outlet communicating with the central water flow channel is formed on either the upper or lower end cap. The adaptive throttling central tube assembly is used to adaptively adjust the total effective cross-sectional area of ​​the water passage hole according to the force of the flowing water.

[0008] Preferably, an annular flow guiding cavity is formed between the inner wall of the flow guiding outer cover assembly and the outer side of the folded filter membrane assembly. The flow guiding outer cover assembly includes an outer cover cylinder. The water inlet channel is a plurality of tangential water inlet grooves arranged in a circumferential array on the cylinder wall of the outer cover cylinder. The channel axis of the tangential water inlet grooves forms an acute angle with the tangential direction of the cross-section of the outer cover cylinder. A spiral fluid guiding rib protrudes inward and is integrally formed on the inner wall of the outer cover cylinder. The spiral fluid guiding rib is located in the annular flow guiding cavity and extends spirally from top to bottom.

[0009] Preferably, the lower end cover is recessed in the area directly below the annular guide cavity to form a sand collection groove. The bottom of the sand collection groove is provided with a sand discharge hole that penetrates the lower end cover in the circumferential direction, and a one-way duckbill valve is installed in the sand discharge hole.

[0010] Preferably, the folded filter membrane assembly includes a folded filter membrane body that is continuously folded along the circumference to form an alternating wave crest and trough structure. The outer water-facing surface of the folded filter membrane body is tightly fitted with an outer rigid wave support net, and the inner backwater surface of the folded filter membrane body is tightly fitted with an inner rigid wave support net.

[0011] Preferably, the peak and trough undulations of the outer rigid wave support net and the inner rigid wave support net are consistent with the folding angle of the folded filter membrane body, and the outer rigid wave support net, the folded filter membrane body and the inner rigid wave support net form a geometrically conformal nested structure in the radial direction.

[0012] Preferably, the adaptive throttling center tube assembly includes an external support tube, an internal sliding tube is coaxially rotatably sleeved in the inner cavity of the external support tube, an array of outer tube water passage holes are formed on the tube wall of the external support tube, and an array of inner tube water passage holes are formed on the tube wall of the internal sliding tube, the outer tube water passage holes and the inner tube water passage holes together constitute the water passage hole.

[0013] Preferably, a water flow force-bearing plate is obliquely fixed in the central water flow channel of the internal sliding tube, and an anti-torsion helical spring is provided between the outer wall of the internal sliding tube and the inner wall of the external support tube.

[0014] Preferably, the water flow force-bearing lever has a water-facing inclined surface facing the central water flow channel. The anti-torsion helical spring applies a circumferential preload to the inner sliding tube to maintain the inner sliding tube in a first circumferential position. In the first circumferential position, the water passage hole of the outer tube and the water passage hole of the inner tube are directly opposite each other. The inner sliding tube and the outer support tube have circumferential rotational freedom, so that the inner sliding tube can rotate relative to the outer support tube to a second circumferential position after counteracting the circumferential preload. In the second circumferential position, the water passage hole of the inner tube and the water passage hole of the outer tube are circumferentially offset.

[0015] Preferably, both the outer tube water passage and the inner tube water passage are elongated slots extending axially along the outer support tube and the inner sliding tube. In the second circumferential position, the radial overlap and connection area of ​​the inner tube water passage and the outer tube water passage is smaller than the overlap and connection area in the first circumferential position.

[0016] Preferably, the bottom surface of the upper end cover and the top surface of the lower end cover are respectively recessed to form a top sealing groove and a bottom sealing groove. The top ends of the folded filter membrane body, the outer rigid wave support net and the inner rigid wave support net are jointly fitted and fixed in the top sealing groove, and the bottom ends of the three are jointly fitted and fixed in the bottom sealing groove.

[0017] The beneficial effects of this invention are: This invention utilizes a flow-guiding outer casing assembly with tangential inlet grooves and spiral fluid-guiding ribs, combined with a sand-collecting ring groove at the bottom and a one-way duckbill valve. This forces the raw water entering the filter cartridge to form a high-speed downward swirling centrifugal flow, pre-separating and automatically discharging hard sand particles entrained in the water before they contact the filter membrane. This design effectively avoids direct cutting and physical wear of the fragile internal filter membrane by sharp sand particles, significantly extending the service life of the filter cartridge in harsh outdoor water source environments with silt and sand.

[0018] Meanwhile, an outer rigid wave support net and an inner rigid wave support net are tightly bonded to the inner and outer sides of the pleated filter membrane body, respectively, and the three form a geometrically conformal nested structure with consistent wave peaks and troughs along the radial direction. This bidirectional rigid skeleton support can effectively disperse the force when subjected to strong radial pressure from the water flow, avoiding the phenomenon of the pleated filter membrane being squeezed and bonded together under high pressure, thus maintaining the maximum effective filtration area and ensuring a continuous and efficient water purification flow.

[0019] In addition, this application incorporates an adaptive throttling center tube assembly comprising an external support tube and an internal sliding tube, with a water flow force-bearing flap and an anti-torsion helical spring internally fitted. When subjected to a sudden high-pressure water flow impact, the high-speed water flow impacts the flap, causing the internal sliding tube to rotate against the spring resistance, resulting in misalignment of the water passage holes in the inner and outer tubes and an instantaneous reduction in the effective flow area. This mechanism generates dynamic back pressure inside the filter screen through a purely passive mechanical induction method, offsetting the external destructive impact force and effectively preventing the filter membrane from tearing due to instantaneous overpressure. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a filter element provided in an embodiment of the present invention; Figure 2 This is an internal cross-sectional view of the flow guide outer cover assembly provided in an embodiment of the present invention; Figure 3 This is an internal cross-sectional view of the adaptive throttling center tube assembly provided in an embodiment of the present invention; Figure 4 This is a schematic sectional view of the end of the adaptive throttling center tube assembly provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of a folded filter membrane assembly provided in an embodiment of the present invention.

[0021] The components include: 1. Upper end cap; 2. Lower end cap; 3. Adaptive throttling center tube assembly; 4. Water passage hole; 5. Folded filter membrane assembly; 6. Flow guide outer cover assembly; 7. Clean water outlet; 8. Outer cover cylinder; 9. Tangential water inlet inclined groove; 10. Spiral fluid guide rib; 11. Sand collection ring groove; 12. Sand discharge hole; 13. One-way duckbill valve; 14. Folded filter membrane body; 15. Outer rigid wave support net; 16. Inner rigid wave support net; 17. External support pipe; 18. Internal sliding pipe; 19. Outer pipe water passage hole; 20. Inner pipe water passage hole; 21. Water flow force deflector; 22. Anti-torsion helical spring. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] In the description of the invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", 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 the invention 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 the invention.

[0024] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Please see the appendix Figure 1 -Appendix Figure 5This invention provides a wear-resistant and pressure-resistant pleated outdoor water filter cartridge, including an upper end cap 1, a lower end cap 2, and an adaptive throttling central tube assembly 3. The adaptive throttling central tube assembly 3 has an axially extending central water flow channel formed inside. A water passage hole 4 connecting the outside to the central water flow channel is provided on the tube wall of the adaptive throttling central tube assembly 3. A pleated filter membrane assembly 5 is coaxially sleeved on the outer periphery of the adaptive throttling central tube assembly 3, and a flow guide outer cover assembly 6 is coaxially sleeved on the outer periphery of the pleated filter membrane assembly 5. The outer casing assembly 6 has an inlet channel for external raw water to enter. The upper and lower ends of the folded filter membrane assembly 5 are sealed to the upper end cover 1 and the lower end cover 2, respectively. The adaptive throttling central tube assembly 3 and the outer casing assembly 6 are respectively limited and assembled between the upper end cover 1 and the lower end cover 2. The upper end cover 1 or the lower end cover 2 has a clean water outlet 7 that communicates with the central water flow channel. The adaptive throttling central tube assembly 3 is used to adaptively adjust the total effective cross-sectional area of ​​the water passage 4 according to the force of the flowing water.

[0026] Specifically, the outdoor raw water first comes into contact with the flow guide cover assembly 6, which provides initial physical protection for the internal core components and guides the water flow into the filter in an orderly manner. The raw water flows smoothly through the inlet channel, ensuring that the filter element has sufficient initial inlet flow. Then, the water flows to the pleated filter membrane assembly 5, which performs core particle interception and deep purification treatment, transforming the raw water into clean water. During this filtration process, the upper end cover 1 and the lower end cover 2 work together to seal the ends, effectively preventing the raw water from bypassing the filter without side filtration, forcing the water flow to completely penetrate the filter structure. The purified water then passes through… Water flows smoothly inward through holes 4. These holes not only act as bridges connecting the cross sections but also dynamically control the water flow rate. The water then enters the adaptive throttling central pipe assembly 3. This assembly, while serving as the overall support frame, can sensitively detect the force of the flowing water and adaptively change the cross-sectional area of ​​the water passage. In this way, it can adjust the water flow resistance and form back pressure when encountering instantaneous high pressure, achieving dynamic pressure resistance and protecting the filter membrane from tearing. The collected purified water flows axially under the smooth guidance of the central water flow channel and is finally discharged outward through the purified water outlet 7, making it convenient for users to collect and drink directly.

[0027] An annular flow guiding cavity is formed between the inner wall of the flow guiding outer cover assembly 6 and the outer side of the folded filter membrane assembly 5. The flow guiding outer cover assembly 6 includes an outer cover cylinder 8. The water inlet channel is a plurality of tangential water inlet grooves 9 arranged in a circumferential array on the cylinder wall of the outer cover cylinder 8. The channel axis of the tangential water inlet groove 9 forms an acute angle with the tangential direction of the cross section of the outer cover cylinder 8. A spiral fluid guiding rib 10 protrudes inward and is integrally formed on the inner wall of the outer cover cylinder 8. The spiral fluid guiding rib 10 is located in the annular flow guiding cavity and extends spirally from top to bottom.

[0028] Specifically, when the water flows into the outer structure, the outer casing 8 can stably carry the fluid and restrict its movement within a specific range to maintain the stability of the fluid environment. At this time, the raw water is forced to enter along the tangential inlet channel 9. The tangential inlet channel 9 forcibly changes the original incident direction of the straight water flow and gives the water flow initial circumferential rotational kinetic energy, causing the water flow to produce a high-speed swirling effect. Subsequently, the high-speed rotating water flow enters the annular guide cavity. This cavity provides sufficient buffering and separation space for the continuous rotation of the water flow and the physical sedimentation of sand particles. In this space, the spiral fluid guide ribs 10 continuously guide the rotating water flow downward, further enhancing the centrifugal force of the fluid, thereby accelerating the hard particles entrained in the water to be thrown out to the outside and quickly settle downward, achieving the sand removal and anti-wear effect of separating sand and water by relying on pure physical guidance and avoiding sand particles cutting and damaging the internal filter membrane.

[0029] The area directly below the annular guide cavity of the lower end cover 2 is recessed to form a sand collection groove 11. The bottom of the sand collection groove 11 is provided with a sand discharge hole 12 that penetrates the lower end cover 2 along the circumferential direction. A one-way duckbill valve 13 is installed in the sand discharge hole 12.

[0030] Specifically, during the water flow rotation and sand removal process, the separated hard sand particles, under the combined action of gravity and the downward thrust of the fluid, will fall into the sand collection ring groove 11. The sand collection ring groove 11 plays the role of collecting and storing the settled impurities, effectively preventing the hard sand particles from floating back to the surface and mixing into the main water channel under the agitation of the water flow. Subsequently, the continuously accumulating impurities and sand particles, along with some of the water they carry, will move outward through the sand discharge hole 12. The sand discharge hole 12 provides a dedicated and smooth channel for the final discharge of impurities. Under the continuous squeezing of water pressure and gravity, the sand particles will push outward through the one-way duckbill valve 13 and be discharged out of the system. While playing the role of one-way sewage discharge and pressure relief, the one-way duckbill valve 13 can automatically close to block the external environment and prevent external dirty water from flowing back into the filter element, thereby ensuring the purity of the filtration environment inside the entire filter element and the stability of the system pressure.

[0031] The folded filter membrane assembly 5 includes a folded filter membrane body 14 that is continuously folded along the circumference and has an alternating structure of crests and troughs. An outer rigid wave support net 15 is tightly attached to the outer water-facing surface of the folded filter membrane body 14, and an inner rigid wave support net 16 is tightly attached to the inner backwater surface of the folded filter membrane body 14.

[0032] Specifically, when the water flows to the core filtration zone, the folded filter membrane body 14 increases the fluid contact area through its alternating folds, undertaking the deep purification filtration function of intercepting tiny impurities. The outer rigid wave support net 15 directly resists the strong external water flow impact pressure on the water-facing side, effectively preventing the filter membrane from being compressed and deformed inward. The inner rigid wave support net 16 provides a stable internal skeleton support on the back water side, preventing the filter membrane from rupturing under back pressure or abnormal water flow. The three work together to ensure the safety and stability of the filtration process.

[0033] The peaks and troughs of the outer rigid wave support net 15 and the inner rigid wave support net 16 are consistent with the folding angle of the folded filter membrane body 14. The outer rigid wave support net 15, the folded filter membrane body 14 and the inner rigid wave support net 16 form a geometrically conformal nested structure along the radial direction.

[0034] Specifically, during the process of withstanding the impact of severe water flow, the overall geometric conformal nested structure ensures that the fluid extrusion pressure is transmitted extremely evenly between the layers, eliminating the hidden danger of local stress concentration and effectively avoiding the phenomenon of dead folds that cause the folded filter membrane body 14 to be squeezed and stuck together under strong pressure. Thus, it always maintains the maximum and unobstructed effective water flow filtration area, ensuring a continuous and stable water purification output efficiency.

[0035] The adaptive throttling center tube assembly 3 includes an external support tube 17, an internal sliding tube 18 is coaxially rotatably sleeved in the inner cavity of the external support tube 17, an array of external tube water passage holes 19 are opened on the tube wall of the external support tube 17, and an array of internal tube water passage holes 20 are opened on the tube wall of the internal sliding tube 18. The external tube water passage holes 19 and the internal tube water passage holes 20 together constitute a water passage hole 4.

[0036] Specifically, when the purified water flows inward, the external support pipe 17 acts as a sturdy static skeleton to bear the radial pressure of the overall structure and maintain the structural integrity of the central water channel. The internal sliding pipe 18 acts as a movable throttling valve core to dynamically control the internal water flow. At the same time, the water passage holes 19 of the outer pipe and 20 of the inner pipe together provide the necessary fluid path for purified water to penetrate and flow into the central water channel. The relative opening and closing states of the two directly determine the water inlet resistance and flow rate of the entire filter element.

[0037] A water flow force-bearing plate 21 is fixedly installed at an inclination in the central water flow channel of the internal sliding tube 18, and an anti-torsion helical spring 22 is installed between the outer wall of the internal sliding tube 18 and the inner wall of the external support tube 17.

[0038] Specifically, the water flow gathered in the central water channel continues to flow forward. The water flow force deflector 21 can keenly detect the kinetic energy changes of the flowing water and efficiently convert the linear impact thrust of the fluid into mechanical rotational torque. The anti-torsion helical spring 22 plays the role of elastic energy storage and damping support, maintaining the stability of the system shape when the water flow is stable, and releasing the accumulated elastic potential energy after the high pressure impact ends to drive the internal structure to automatically recover, realizing the pure mechanical passive sensing of water pressure by the filter element.

[0039] The water flow force-bearing lever 21 has a water-facing inclined surface facing the central water flow channel. The anti-torsion helical spring 22 applies a circumferential preload to the inner sliding tube 18 to maintain the inner sliding tube 18 in the first circumferential position. In the first circumferential position, the outer tube water passage hole 19 and the inner tube water passage hole 20 are directly opposite each other. The inner sliding tube 18 and the outer support tube 17 have circumferential rotational freedom, so that the inner sliding tube 18 can rotate relative to the outer support tube 17 to the second circumferential position after the circumferential preload is counteracted. In the second circumferential position, the inner tube water passage hole 20 and the outer tube water passage hole 19 are arranged circumferentially offset.

[0040] Specifically, with the continuous impact of the water flow, the inclined surface facing the water improves the efficiency of converting the fluid impact force into torque by utilizing the inclined surface guiding characteristics, making the force sensing more sensitive. At the same time, the circumferential preload can resist the fluctuation of the normal water flow to maintain the first circumferential posture, ensuring that the maximum water inflow is maintained under safe water pressure. When encountering destructive instantaneous high pressure, the internal components can overcome the preload and rotate smoothly to the second circumferential posture by relying on the circumferential rotational degree of freedom, quickly realizing the staggered interception of the water passage holes, instantly reducing the flow area and forming a protective back pressure, effectively resisting the damage of instantaneous high pressure to the fragile filter membrane.

[0041] Both the outer pipe water passage 19 and the inner pipe water passage 20 are elongated slots extending along the axial direction of the outer support pipe 17 and the inner sliding pipe 18. In the second circumferential position, the radial overlap and connection area of ​​the inner pipe water passage 20 and the outer pipe water passage 19 is smaller than the overlap and connection area in the first circumferential position.

[0042] Specifically, at the moment of channel misalignment and throttling, the design of the elongated slot plays a core interception role. It can generate an overlapping connection area change rate at an extremely small rotation angle. This shape allows the water passage to quickly reduce the flow cross section when misalignment occurs, improving the filter element's throttling response agility and the accuracy of water flow control when facing sudden high pressure.

[0043] The bottom surface of the upper end cover 1 and the top surface of the lower end cover 2 are respectively recessed to form a top sealing groove and a bottom sealing groove. The top ends of the folded filter membrane body 14, the outer rigid wave support net 15 and the inner rigid wave support net 16 are fitted together and fixed in the top sealing groove, and the bottom ends of the three are fitted together and fixed in the bottom sealing groove.

[0044] Specifically, during the overall operation cycle of the filter cartridge, the top and bottom sealing grooves provide a deep space for fitting and tightly covering the ends of the filter media structure. This acts as a seal to prevent raw water from bypassing the side filter membrane and directly seeping into the central purified water path through the gaps at both ends. This eliminates any form of unfiltered water leakage and ultimately ensures the absolute purity and drinking safety of the water output from the filter cartridge.

[0045] Working principle: When the external raw water containing hard sand particles and impurities is pumped into the filter element under pressure, the water flow first contacts the outermost guide cover assembly 6 and is forced to enter the interior along the tangential water inlet groove 9 on the wall of the outer cover cylinder 8. At this time, the water flow changes the direction of linear motion to form a high-speed rotating vortex. Subsequently, under the continuous guidance of the spiral fluid guide ribs 10, the water flow generates a strong downward centrifugal vortex. During this process, the larger hard sand particles in the water are thrown towards the inner wall of the outer cover cylinder 8 under the action of centrifugal force and fall into the sand collection ring groove 11 located above the lower end cover 2. Finally, the sand particles are pushed open by gravity and water pressure and discharged from the filter element through the sand discharge hole 12. This completes the pure mechanical sand removal and anti-wear before the water flow contacts the filter membrane. Subsequently, the relatively clean water flow after the sand particles are stripped away by the swirling flow continues to flow radially inward and impact the pleated filter membrane assembly 5. At this time, the water flow first penetrates the outer rigid wave support net 15, then penetrates the pleated filter membrane body 14 for core particle interception and filtration, and finally passes through the inner rigid wave support net 16. During this filtration process, since the outer rigid wave support net 15 and the inner rigid wave support net 16 are tightly nested on both sides of the pleated filter membrane body 14, and the upper and lower ends of the overall structure are firmly sealed and limited between the upper end cover 1 and the lower end cover 2, the rigid skeleton of the wave net can effectively resist the strong radial extrusion force of the water flow, ensuring that the gaps of the pleated filter membrane body 14 are open and no squeezed dead folds occur. The filtered water continues to flow inward and is ready to enter the adaptive throttling central pipe assembly 3. Under the initial normal water pressure, the outer pipe water passage hole 19 on the outer support pipe 17 and the inner pipe water passage hole 20 on the inner sliding pipe 18 are in a state of direct overlap, thus forming a water passage hole 4 with the maximum cross-sectional area. The purified water smoothly penetrates the water passage hole 4 and flows into the central water flow channel of the inner sliding pipe 18. During the use of the filter element, if it is suddenly impacted by an external instantaneous high-pressure water flow, the water flow velocity in the central water flow channel will increase sharply. At this time, the high-speed water flow will violently impact the water flow force-bearing plate 21 set inside the internal sliding tube 18. The fluid impact force on the water flow force-bearing plate 21 is converted into torque. This torque will overcome the resistance of the anti-torsion helical spring 22, thereby causing the internal sliding tube 18 to rotate circumferentially at a small angle relative to the external support tube 17. At this time, the water passage hole 20 of the inner tube and the water passage hole 19 of the outer tube are circumferentially misaligned, thereby instantly reducing the total effective cross-sectional area of ​​the water passage hole 4. This increases the resistance of the water flow into the adaptive throttling central tube assembly 3 and forms an outward back pressure on the inside of the folded filter membrane assembly 5, thereby offsetting the excessive external destructive instantaneous water pressure and achieving dynamic pressure protection. When the instantaneous water pressure weakens and returns to stability, the anti-torsion helical spring 22 releases the accumulated deformation elastic force, causing the internal sliding tube 18 to rotate in the opposite direction and reset, so that the water passage 4 returns to the maximum normal flow state; finally, the purified water collected inside the adaptive throttling central tube assembly 3 flows along the axial direction and is eventually safely discharged through the purified water outlet 7, waiting for the user to collect and drink.

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A wear-resistant and pressure-resistant pleated outdoor water purification filter element, characterized in that, The device includes an upper end cap (1), a lower end cap (2), and an adaptive throttling central pipe assembly (3). The adaptive throttling central pipe assembly (3) has an axially extending central water flow channel inside. A water passage hole (4) connecting the external environment to the central water flow channel is provided on the pipe wall of the adaptive throttling central pipe assembly (3). A folded filter membrane assembly (5) is coaxially fitted on the outer periphery of the adaptive throttling central pipe assembly (3). A flow guide outer cover assembly (6) is coaxially fitted on the outer periphery of the folded filter membrane assembly (5). An external raw water inlet is provided on the wall of the flow guide outer cover assembly (6). The water inlet channel is provided, and the upper and lower ends of the folded filter membrane assembly (5) are respectively sealed and connected to the upper end cover (1) and the lower end cover (2). The adaptive throttling center tube assembly (3) and the flow guide outer cover assembly (6) are respectively limited and assembled between the upper end cover (1) and the lower end cover (2). The upper end cover (1) or the lower end cover (2) is provided with a clean water outlet (7) that communicates with the central water flow channel. The adaptive throttling center tube assembly (3) is used to adaptively adjust the total effective cross-sectional area of ​​the water passage hole (4) according to the force of the flowing water.

2. The wear-resistant and pressure-resistant pleated outdoor water purification filter element according to claim 1, characterized in that, The inner wall of the flow guide outer cover assembly (6) and the outer side of the folded filter membrane assembly (5) form an annular flow guide cavity. The flow guide outer cover assembly (6) includes an outer cover cylinder (8). The water inlet channel is a plurality of tangential water inlet grooves (9) arranged in a circumferential array on the cylinder wall of the outer cover cylinder (8). The channel axis of the tangential water inlet groove (9) forms an acute angle with the tangential direction of the cross section of the outer cover cylinder (8). A spiral fluid guide rib (10) protrudes inward and is integrally formed on the inner wall of the outer cover cylinder (8). The spiral fluid guide rib (10) is located in the annular flow guide cavity and extends spirally from top to bottom.

3. The wear-resistant and pressure-resistant pleated outdoor water purification filter element according to claim 2, characterized in that, The lower end cover (2) is recessed in the area directly below the annular guide cavity to form a sand collection groove (11). The bottom of the sand collection groove (11) is provided with a sand discharge hole (12) that penetrates the lower end cover (2) in the circumferential direction. A one-way duckbill valve (13) is installed in the sand discharge hole (12).

4. The wear-resistant and pressure-resistant pleated outdoor water filter element according to claim 1, characterized in that, The folded filter membrane assembly (5) includes a folded filter membrane body (14) that is continuously folded along the circumference and has an alternating structure of crests and troughs. The outer water-facing surface of the folded filter membrane body (14) is tightly fitted with an outer rigid wave support net (15), and the inner backwater surface of the folded filter membrane body (14) is tightly fitted with an inner rigid wave support net (16).

5. The wear-resistant and pressure-resistant pleated outdoor water purification filter element according to claim 4, characterized in that, The peak and trough undulations of the outer rigid wave support net (15) and the inner rigid wave support net (16) are consistent with the folding angle of the folded filter membrane body (14). The outer rigid wave support net (15), the folded filter membrane body (14) and the inner rigid wave support net (16) form a geometrically conformal nested structure along the radial direction.

6. The wear-resistant and pressure-resistant pleated outdoor water purification filter element according to claim 1, characterized in that, The adaptive throttling center tube assembly (3) includes an external support tube (17), an internal sliding tube (18) is coaxially rotatably sleeved in the inner cavity of the external support tube (17), an array of external tube water passage holes (19) are opened on the tube wall of the external support tube (17), an array of internal tube water passage holes (20) are opened on the tube wall of the internal sliding tube (18), and the external tube water passage holes (19) and the internal tube water passage holes (20) together constitute the water passage hole (4).

7. The wear-resistant and pressure-resistant pleated outdoor water purification filter element according to claim 6, characterized in that, A water flow force-bearing plate (21) is fixedly installed at an inclination in the central water flow channel of the internal sliding tube (18), and an anti-torsion helical spring (22) is installed between the outer wall of the internal sliding tube (18) and the inner wall of the external support tube (17).

8. The wear-resistant and pressure-resistant pleated outdoor water purification filter element according to claim 7, characterized in that, The water flow force-bearing lever (21) has a water-facing inclined surface facing the central water flow channel. The anti-torsion helical spring (22) applies a circumferential preload to the inner sliding tube (18) to maintain the inner sliding tube (18) in a first circumferential position. In the first circumferential position, the outer tube water passage (19) and the inner tube water passage (20) are directly opposite each other. The inner sliding tube (18) and the outer support tube (17) have circumferential rotational freedom, so that the inner sliding tube (18) can rotate relative to the outer support tube (17) to a second circumferential position after offsetting the circumferential preload. In the second circumferential position, the inner tube water passage (20) and the outer tube water passage (19) are arranged circumferentially offset.

9. A wear-resistant and pressure-resistant pleated outdoor water purification filter element according to claim 8, characterized in that, The outer tube water passage hole (19) and the inner tube water passage hole (20) are both elongated slots extending along the axial direction of the outer support tube (17) and the inner sliding tube (18). In the second circumferential position, the radial overlap and connection area of ​​the inner tube water passage hole (20) and the outer tube water passage hole (19) is smaller than the overlap and connection area in the first circumferential position.

10. A wear-resistant and pressure-resistant pleated outdoor water purification filter element according to claim 4, characterized in that, The bottom surface of the upper end cover (1) and the top surface of the lower end cover (2) are respectively recessed to form a top sealing groove and a bottom sealing groove. The top ends of the folded filter membrane body (14), the outer rigid wave support net (15) and the inner rigid wave support net (16) are fitted together and fixed in the top sealing groove, and the bottom ends of the three are fitted together and fixed in the bottom sealing groove.

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