A filter water saver

Abstract

The utility model relates to filter water -saving technical field, concretely is a kind of filter water -saving device. Including lower shell and detachably connected upper shell in lower shell top, upper shell top is equipped with the protruding water inlet, and lower shell bottom is equipped with the protruding water outlet;Filter core cylinder and the bottom of lower shell inner ring are equipped with the stepped limiting platform abutment;Limiting platform and the cavity formed by filter core cylinder are equipped with water distribution plate. Compared with prior art, by setting water distribution plate with two ends wide, middle narrow helical small through-hole below filter cylinder, guide water flow evenly covers filter cylinder whole domain, improves filter material utilization and filtering effect;In addition, by setting the thread connection upper and lower shell with sawtooth-shaped cross section, while continuing the detachable shell advantage of filter, improve the sealing of shell, prevent the loose of connecting place caused by water flow gravity influence.

Description

Technical Field

[0001] This utility model relates to the field of water-saving filtration technology, specifically a water-saving filter. Background Technology

[0002] As people pay more and more attention to the health of water in their daily lives, in addition to focusing on drinking water, the demand for water that comes into contact with the skin is also gradually increasing. Especially during the shower, because hot water opens the pores on the skin, chlorine and other pollutants can be absorbed by the body through the skin and respiration, which can be harmful to human health. Therefore, people have increasingly higher demands for the functionality of shower filtration equipment.

[0003] To address this issue, Chinese utility model patent CN215365268U proposes a multifunctional shower filter. This filter aims to remove residual chlorine and various harmful substances from shower water through a separate outer shell and filter element, preventing the absorption of chlorine and other pollutants through the skin. It also allows for easy installation and replacement of the filter element. However, this dual-layer filter structure does not actively guide the water flow. Due to gravity, the water tends to concentrate in the central area of ​​the filter element, preventing the peripheral filter media of the outer shell and the vitamin C powder of the inner filter tube from fully participating in filtration, resulting in low filter media utilization. Furthermore, the gravity-induced water flow may cause the upper and lower shells of the filter to loosen, leading to water leakage from the joints. Utility Model Content

[0004] The problem this utility model aims to solve is to overcome the above-mentioned technical defects and provide a water-saving filter. By setting a water distribution plate with spiral-shaped small through holes that are wide at both ends and narrow in the middle below the filter cylinder, the water flow is guided to evenly cover the entire area of ​​the filter cylinder, thereby improving the utilization rate of the filter media and the filtration effect.

[0005] Another objective of this invention is to improve the sealing performance of the housing by using a sawtooth-shaped threaded connection between the upper and lower housings, thereby maintaining the basic advantage of the filter's detachable housing and preventing loosening at the connection due to the influence of water flow gravity.

[0006] To solve the above problems, the technical solution provided by this utility model is as follows: A water-saving filter includes a lower housing and an upper housing detachably connected above the lower housing. The upper housing has a raised inlet at the top and a raised outlet at the bottom of the lower housing. A filter cartridge abuts against a stepped limiting platform at the bottom of the inner ring of the lower housing. A water distribution plate is provided in the cavity formed by the limiting platform and the filter cartridge. The detachable housing facilitates filter cartridge replacement and maintenance; the raised inlet and outlet facilitate connection to pipes, resulting in a compact structure and reduced risk of leakage; the stepped limiting platform precisely positions the filter cartridge, preventing it from shaking or shifting within the housing, ensuring sealing and a stable filtration path; the water distribution plate ensures even water flow through the filter cartridge, preventing concentrated water flow that could lead to localized filter media saturation or non-filtration, thus improving filtration efficiency and filter media utilization.

[0007] Preferably, the bottom of the upper housing is provided with an external thread with a serrated cross-section. One side of the thread teeth is a horizontal plane, and the other side is an inclined plane. The horizontal plane bears the main weight, while the inclined plane provides support. The top of the lower housing is provided with an internal thread that matches the external thread. The horizontal plane bearing design can enhance the thread's compressive strength and prevent sealing leakage caused by the housing disengaging under pressure. The inclined plane guidance facilitates screwing in, reduces installation effort, improves sealing accuracy, and provides good support for the horizontal plane.

[0008] Preferably, the water distribution plate has several spiral-shaped circular through holes with a cross-section that is wider at both ends and narrower in the middle; a water-saving device is installed below the water distribution plate. The Venturi effect pore structure design, which is wider at both ends and narrower in the middle, can accelerate water flow and adsorb fine impurities through negative pressure, thereby enhancing the filtration effect; the spiral through holes can guide the water flow to rotate, further evenly distribute the water, and reduce eddies and dead zones; the water-saving device can adjust the water flow rate to achieve water-saving function and maintain stable water pressure.

[0009] Preferably, the upper housing has an upper limit protrusion that abuts against the filter element cover; the lower housing has a lower limit protrusion that abuts against the upper housing. The design of the limit protrusions can accurately position the filter element, prevent the filter element from moving up and down, ensure that the sealing surface is pressed tightly, and at the same time enhance the stability of the structure, prevent the connection between the filter element and the housing from loosening, and improve the pressure resistance to water flow.

[0010] Preferably, the upper housing has an outward flange that forms a smooth connection surface with the lower housing. The transition at the connection point between the housings is smooth, without protruding edges, which is aesthetically pleasing, prevents scratches, and enhances the user experience, making it especially suitable for detachable structures that require frequent operation.

[0011] Preferably, the filter cartridge cover and filter cartridge are detachably connected. This facilitates filter media replacement, allowing users to fill or replace different filter media themselves to meet varying water quality requirements. It also reduces costs, as only the filter media needs to be replaced, rather than the entire filter cartridge, making it economical and environmentally friendly.

[0012] Preferably, the upper limit protrusion forms an upper limit groove with the inner wall of the upper housing, and an upper sealing ring is provided in the upper limit groove; the lower limit protrusion forms a lower limit groove with the inner wall of the lower housing, and a lower sealing ring is provided in the lower limit groove. By rationally utilizing the groove formed by the limit protrusion and the inner wall of the housing for sealing, the filter cartridge can be limited without requiring additional structures, and the sealing performance of the water-saving filter can be improved. The double sealing structure ensures that there is no leakage at the inlet / outlet and the connection between the housing.

[0013] Preferably, the filter cartridge has several water outlet holes at the bottom; the top of the filter cartridge cover has a mesh structure; and the filter cartridge has several partition layers inside, with filter media laid layer by layer inside the filter cartridge. The mesh filter cartridge cover is used for preliminary filtration of large particulate impurities and to protect the lower filter media; the middle partition layers can accommodate various combinations of filter media to achieve multi-stage filtration; and the evenly distributed water outlet holes at the bottom can prevent concentrated water flow and extend the filter cartridge's lifespan.

[0014] Preferably, the inner ring of the inlet is threaded and connected to the inlet pipe via threads; the outer ring of the outlet is threaded and connected to the outlet pipe via threads. The standardized interface design is compatible with common water pipe fittings, making installation convenient; at the same time, the internal thread inlet and external thread outlet structure makes it easy to distinguish the inlet and outlet directions and prevent reverse installation.

[0015] Preferably, a sealing gasket is provided at the bottom of the threaded end of the water inlet. Since the user uses water at different times at different times, and the materials of the water inlet pipe and the shell have different coefficients of thermal expansion, the contraction and expansion of the two differ when the water temperature changes. This can easily lead to a larger gap in the threaded connection. The elasticity of the sealing gasket can dynamically adapt to this deformation, always maintaining a tight seal and preventing leakage caused by temperature fluctuations. At the same time, it complements the sealing ring structure, jointly achieving multiple seals and improving the overall reliability of the water-saving filter and the user experience.

[0016] The beneficial effects of this utility model are as follows: By setting a water distribution plate with spiral-shaped circular through holes at the bottom of the filter cartridge, the water flow is guided to be evenly dispersed, eliminating the filtration dead corners caused by gravity in the filter cartridge and improving the utilization rate of the filter media.

[0017] The sawtooth external thread on the upper shell supports gravity on the horizontal surface and provides support on the inclined surface, thereby enhancing the meshing strength. It works in conjunction with the lower limit protrusion to fix the position of the shell and prevent loosening caused by water flow impact or long-term use.

[0018] By installing a water-saving device below the water distribution plate, the water flow rate is reduced while pressure compensation is performed to maintain the water pressure of the filter water-saving device, thus avoiding the problem of sacrificing user experience for water saving.

[0019] The sealing rings in the upper and lower limit grooves and the inlet sealing gasket form a multi-seal structure, which blocks leakage from possible water flow through the shell joints and thread gaps, thus improving the usability and durability of the filter water saver.

[0020] With its detachable upper and lower housings and detachable filter cover and cartridge, filter replacement or media replenishment can be completed without special tools, simplifying the operation process.

[0021] The inlet and outlet threads are compatible with most inlet and outlet pipe specifications on the market, allowing for installation without modifying existing pipes, making it suitable for various scenarios such as homes, hotels, and apartments. Attached Figure Description

[0022] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is a structural diagram of the upper shell of this utility model; Figure 3 This is a structural diagram of the lower shell of this utility model; Figure 4 This is a structural diagram of the filter element of this utility model; In the diagram: 1. Upper shell; 11. Inlet; 12. External thread; 13. Upper limit protrusion; 131. Upper limit groove; 14. External flange; 2. Lower shell; 21. Outlet; 22. Internal thread; 23. Lower limit protrusion; 231. Lower limit groove; 24. Limiting platform; 25. Cavity; 3. Filter cartridge; 31. Filter cover; 32. Filter media; 33. Filter port; 4. Water distribution plate; 5. Water saver; 6. Upper sealing ring; 7. Lower sealing ring; 8. Sealing gasket. Detailed Implementation

[0023] like Figure 1 As shown, a water-saving filter includes a lower housing 2 and an upper housing 1 detachably connected above the lower housing 2. The upper and lower housings are connected by threads. The top of the upper housing 1 and the center of the bottom of the lower housing have protruding inlet and outlet ports. A filter cartridge 3 is housed inside the housing, with a filter cartridge cover 31 on top. The cartridge is filled with layered filter media 32, with separators between different media. The filter cartridge 3 abuts against a stepped limiting platform 24 located at the bottom of the inner ring of the lower housing 2. A water distribution plate 4 is located within the cavity 25 formed by the limiting platform 24 and the filter cartridge 3. The water distribution plate 4 has several spiral-shaped circular through holes with a cross-section that is wider at both ends and narrower in the middle. A water-saving device 5 is located below the water distribution plate 4. This design ensures more even water flow distribution on the water distribution plate 4 at the bottom of the filter cartridge 3, preventing excessive local water flow impact that could cause filter cartridge displacement or deformation.

[0024] The diameter of the water distribution plate 4 perfectly matches the inner diameter of the bottom of the filter cartridge 3, and its edge engages with the stepped limiting platform 24 of the lower housing 2, forming a gapless cover. After the water flows out from the filter port 33 at the bottom of the filter cartridge 3, it cannot bypass the gap between the water distribution plate 4 and the housing of the filter cartridge 3. It must flow down to the water saver 5 through the spiral-shaped small through holes on the water distribution plate 4. This physical interception method forces the water flow to abandon the natural path of concentrating in the middle and instead enter the pre-set dispersion through holes of the water distribution plate 4, laying the foundation for subsequent uniform flow distribution.

[0025] Because the concentrated gravity of water flow is essentially a straight-line downward inertia, even if water is forced into the through-hole, if the through-hole is straight, the water will still flow downward in a straight line, only covering the corresponding area directly below the bottom of the filter cartridge 3, and unable to diffuse to the surrounding area. However, the spiral through-hole of the water distribution plate 4 breaks this inertia through path twisting. The spiral water flow from the through-hole located directly below the center of the filter cartridge 3 will diffuse to the surrounding area; the spiral water flow from the through-hole located directly below the edge of the filter cartridge 3 will further cover the edge area. Through spiral guidance and centrifugal diffusion, the originally concentrated water flow is broken down into multiple small rotating flows, initially achieving dispersion from point to surface.

[0026] If guided solely by a spiral, the water flow at the edge of the filter cartridge might not be sufficient to completely cover the outermost filter media due to insufficient centrifugal force. The design of the water distribution plate 4, with its wide-at-both-ends and narrow-in-the-middle through-hole cross-section, enhances diffusion kinetic energy through water flow acceleration, ensuring full coverage. When water enters the through-holes, it first flows in through the wide opening and then contracts through the narrow opening. According to the "Venturi effect" in fluid mechanics, flow velocity is inversely proportional to cross-sectional area. The flow velocity increases significantly at the narrow opening, and the accelerated spiral water flow possesses stronger diffusion kinetic energy. Even the high-speed rotating water flow from the through-holes near the edge of the filter cartridge can disperse outwards, covering the outermost filter media area. Meanwhile, the high-speed rotating water flow from the central through-holes diffuses evenly to the periphery under centrifugal force, filling the transition area between the center and the edge. Ultimately, the water flow from all the through-holes forms a uniformly covered flow field around the entire circumference, completely eliminating dead zones around the filter cartridge.

[0027] According to the national standard GB / T23447-2018, the standard water flow rate for showerheads is 7.5-9 L / min. However, in actual showering, a flow rate exceeding 6 L / min is sufficient to meet the needs of coverage area and showering sensation; any excess flow is wasted. Water-saving devices (existing technology) precisely control the water flow rate to the rated value through a built-in flow channel design and pressure compensation structure, achieving efficient water saving. The water-saving device 5 is installed below the water distribution plate 4, working in synergy with the plate to first evenly distribute the water flow and then restrict it. The water distribution plate 4 first evenly disperses the water flow, ensuring that the filter media participates in filtration across the entire area. If water saving is done first and then evenly distributed, the water distribution plate 4 may not be able to form an effective swirling diffusion due to insufficient flow, affecting the elimination of dead zones in the filtration process. The water saver 5 limits the flow after the water distribution plate 4, which can prevent the concentrated water flow that is not evenly distributed from directly impacting the water saver 5, prevent the diaphragm or spring from aging prematurely due to excessive local water flow, extend the service life of the water saver, and at the same time ensure that the water after even filtration flows out stably without wasting the filtered clean water.

[0028] like Figure 2 As shown, the top of the upper housing 1 has an integrally formed protruding water inlet 11. The inner ring of the water inlet has threads, and a sealing gasket 8 is provided at the bottom of the threads. As part of the upper housing 1, the water inlet 11 does not have gaps between multiple parts, and its structural strength is higher than that of a detachable type. It will not loosen due to water pressure impact, and there are no independently detachable parts, avoiding the risk of parts loss. Since the water inlet pipe is mostly made of metal and the upper housing 1 is made of plastic, when the water inlet 11 and the water inlet pipe are connected by threads, there are two weak points that are prone to leakage: the gap between the thread teeth and the end face fit gap. The tiny gap between the thread teeth may cause water to seep out along the thread gap. After the water inlet pipe is screwed into the bottom of the internal thread, its end face cannot completely fit with the bottom plane of the internal thread of the water inlet. Water will seep into the thread gap through this end face gap, aggravating the leakage. The sealing gasket can precisely fill the end face gap: when the water inlet pipe is tightened, the sealing gasket is compressed and deformed by the end face of the water inlet pipe and the bottom plane of the water inlet, forming a continuous elastic sealing ring, which completely blocks the path of water from the end face gap into the thread gap.

[0029] The elasticity of the sealing gasket 8 can dynamically compensate for gaps caused by thermal expansion and contraction between different materials: when the temperature rises, the sealing gasket 8 is further compressed to prevent metal from squeezing the plastic; when the temperature drops, the sealing gasket 8 rebounds to fill the expanded end face gap, maintaining sealing pressure at all times and ensuring stable sealing performance under different water temperatures. Simultaneously, it avoids direct contact between the metal and plastic end faces, prevents metal from abrading the plastic surface, extends the service life of the inlet, blocks metal-plastic electrical contact in humid environments, prevents corrosion of the metal inlet pipe end face, ensures smooth long-term disassembly and assembly, and prevents corrosion products from contaminating the water quality.

[0030] The outer ring at the bottom of the upper housing 1 has an external thread with a sawtooth cross-section, and the inner ring at the top of the lower housing 2 has an internal thread that mates with the external thread. The upper housing 1 and the lower housing 2 are detachably connected via the external and internal threads. One side of the thread tooth surface is a horizontal plane, and the other side is an inclined plane. Because the horizontal plane is perpendicular to the thread axis, it provides a large contact area to withstand pressure along the thread axis, which allows the connection to withstand higher system water pressure without thread stripping or damage.

[0031] Traditional V-shaped threads, when subjected to axial force, generate a radial component force that radially separates the two parts. This force causes deformation of the housing, especially plastic housings, thereby disrupting the compression state of the seal and leading to leakage. In contrast, the horizontal plane of a sawtooth thread directly transmits the axial force, generating almost no radial component force. This ensures that the housing does not expand under pressure, perfectly maintaining the effective compression of the seal, and greatly improving sealing reliability and product lifespan.

[0032] Meanwhile, the horizontal surface provides a large contact plane to resist reverse rotation. To loosen the threads, it is necessary to overcome the enormous static friction and mechanical gravity interlocking. Under water flow impact and vibration environments, this connection structure is less likely to loosen on its own, ensuring the stability of the product during long-term use. The inclined surface not only provides effective support for the horizontal surface but also acts as a guiding slope, easily converting rotational motion into linear motion, allowing the threads to engage smoothly, and making installation quick and effortless.

[0033] The upper housing 1 has an upper limit protrusion 13 at the top of its inner ring, which abuts against the filter cover 31. The upper limit protrusion 13 and the inner wall of the upper housing 1 form an upper limit groove 131, and an upper sealing ring 6 is provided in the upper limit groove 131. The upper limit protrusion 13 is an annular protrusion, integrally formed with the inner wall of the upper housing 1. Its bottom surface directly abuts against the top surface of the filter cover 31, forming a downward limiting pressure to counteract the upward pushing force of the water flow impact on the filter assembly, ensuring that the filter assembly is always clamped and fixed with the stepped limiting platform 24 (bottom support) in the lower housing 2, with no axial movement space.

[0034] If there is a gap between the upper limit protrusion 13 and the filter cover 31, unfiltered water will bypass the mesh structure of the filter cover and flow directly through the gap between the outer wall of the filter cartridge and the inner wall of the housing, and then flow directly from the water distribution plate to the outlet, causing filtration failure. The upper sealing ring 6 is embedded in the upper limit groove 131, and the groove width matches the diameter of the sealing ring to ensure that the sealing ring does not fall off. When the filter cover 31 abuts against the upper limit protrusion 13, the top surface of the filter cover will squeeze the sealing ring, causing the sealing ring to undergo radial deformation and tightly fit the gap between the inner wall of the upper limit protrusion and the outer ring of the filter cover, forming an annular sealing band, completely blocking the short-circuit channel of unfiltered water. The upper limit protrusion 13 and the upper sealing ring 6 are not isolated structures, but form a synergistic double seal with the stepped limiting platform of the lower housing and the lower sealing ring. Meanwhile, the upper sealing ring 6 is embedded in the upper limit groove 131, so the sealing ring will not fall off when the upper housing is disassembled, avoiding the loss of small parts by the user. At the same time, there is no need to reposition the sealing ring during the next assembly; it can be directly aligned with the filter cover to achieve a seal.

[0035] The upper housing 1 has an outward flange 14, forming a smooth connection surface with the lower housing 2. This eliminates the sharp edges at the housing connection, fundamentally preventing the risk of users scratching their hands during disassembly and assembly. The smooth transition without unevenness makes the connection between the upper and lower housings more regular, giving the product a high degree of unity and integrity in appearance. This simple and smooth design looks more high-end and professional, significantly improving the product's visual quality and market appeal.

[0036] like Figure 3 As shown, the top of the lower housing 2 is provided with an internal thread 22 that matches the external thread 12, precisely matching the sawtooth external thread of the upper housing. This ensures a tight meshing between the upper and lower housings, maximizing the thread load-bearing capacity and anti-loosening effect, and counteracting loosening caused by water flow impact and temperature changes. It also ensures smooth screwing, allowing for disassembly and assembly without special tools, making it convenient for users to replace the filter element.

[0037] The lower housing 2 has a lower limit protrusion 23 that abuts against the upper housing 1. The lower limit protrusion 23 and the inner wall of the lower housing 2 form a lower limit groove 231, and a lower sealing ring 7 is provided in the lower limit groove 231. The lower limit protrusion 23 abuts against the upper housing, which can precisely control the screwing depth of the upper and lower housings, avoiding excessive screwing and squeezing of the internal filter element and water distribution plate, and protecting the core components from damage. The lower sealing ring 7 in the lower limit groove 231 fills the gap of the housing joint through compression deformation, forming a double seal with the upper sealing ring of the upper housing, completely blocking water leakage from the housing connection, which is suitable for the high humidity environment of the bathroom; the lower limit protrusion 23 can also assist in positioning, preventing misalignment when the upper and lower housings are screwed together, and improving assembly efficiency.

[0038] The lower housing 2 has a threaded outer ring around the protruding water outlet 31 at the bottom, which connects to the water outlet pipe via threads. It is compatible with the internal threads of most water outlet pipes on the market, eliminating the need for adapters and simplifying installation through direct connection.

[0039] like Figure 4 As shown, the filter cartridge cover 31 is detachably connected to the top of the filter cartridge 3. The top of the filter cartridge cover 31 has a mesh structure. The filter cartridge 3 has several partition layers inside, and the filter media 32 is laid layer by layer inside the filter cartridge 3. The bottom of the filter cartridge 3 has several filter ports 33. The partition layers divide the filter cartridge into independent chambers, and the filter media can be laid layer by layer according to the logic of coarse filtration-fine filtration-deep purification. Each type of filter media focuses on treating one type of pollutant, avoiding functional interference caused by mixing different filter media. For example, activated carbon powder can clog the gaps of KDF-55 filter media, significantly improving the removal rate of residual chlorine, heavy metals, and suspended solids. The layered design ensures that the water flow must penetrate the filter media layer by layer without detours, ensuring that each layer of filter media fully participates in filtration. This avoids the problem of the upper layer of traditional mixed filter media becoming saturated first and the lower layer not being activated, extending the effective service life of the entire filter cartridge. Furthermore, the thickness of each filter layer can be adjusted according to different water quality requirements. For example, the thickness of the scale-inhibiting resin layer can be increased in hard water areas, and the thickness of the vitamin C slow-release layer can be increased for users with sensitive skin. There is no need to redesign the filter cartridge structure, which can adapt to the personalized filtration needs of different regions and different groups of people.

[0040] The filter outlets correspond to the internal partition layers of the filter cartridge, allowing the filtered clean water to be quickly discharged to the water distribution plate 4, preventing water pressure loss due to water accumulation at the bottom of the filter cartridge and ensuring stable water pressure from the top spray head. Furthermore, the evenly distributed filter outlets allow the outflowing clean water to first form a circular dispersion flow before entering the spiral through-holes of the water distribution plate, further enhancing the uniformity of the water flow. This also helps the water distribution plate eliminate dead corners in the subsequent flow channels, forming a dual guarantee of uniform flow inside the filter cartridge combined with uniform flow from the external water distribution plate.

[0041] The filter cartridge cover features a combination of a circular cover and a mesh top surface to prevent filter media leakage. The cover's edge has elastic buckles that detachably connect to the annular groove on the inner ring of the filter cartridge top. Pressing the buckles allows for easy removal and replenishment of filter media. The buckles and groove precisely engage, forming a stepped contact surface. When closed, the upper sealing ring 6 ensures a seamless connection between the filter cartridge cover 31 and the top of the filter cartridge 3, preventing unfiltered water from flowing directly around the filter media, avoiding short-circuiting the filtration process, and preventing filter media leakage from the seams under water flow impact.

[0042] The filter media consists of one or more of the following: stainless steel mesh, polypropylene cotton, calcium sulfite, activated carbon, KDF-55, ceramic balls, resin, tourmaline, alkaline balls, antibacterial balls, negative ion balls, medical balls, vitamin C, magnetic balls, mineral balls, and far-infrared mineralization balls. These multifunctional filter media cover functions such as impurity removal, chlorine removal, antibacterial, mineralization, and skin care. They can be flexibly selected, and the separation layer can prevent the filter media from mixing and interfering with each other, so as to give full play to the purification effect of each filter media and adapt to different water qualities and users' personalized needs.

Claims

1. A water-saving filter, characterized in that: Includes a lower housing (2) and an upper housing (1) detachably connected above the lower housing (2); The upper shell (1) has a protruding water inlet (11) at the top, and the lower shell (2) has a protruding water outlet (21) at the bottom. The filter cartridge (3) abuts against the stepped limiting platform (24) provided at the bottom of the inner ring of the lower housing (2); A water distribution plate (4) is provided in the cavity (25) formed by the limiting platform (24) and the filter cartridge (3).

2. The water-saving filter according to claim 1, characterized in that: The bottom of the upper shell (1) is provided with an external thread (12) with a sawtooth cross section. One side of the thread tooth is a horizontal plane and the other side is an inclined plane. The horizontal plane bears the main gravity and the inclined plane forms a support. The top of the lower shell (2) is provided with an internal thread (22) that is adapted to the external thread (12).

3. A water-saving filter according to claim 1, characterized in that: The water distribution plate (4) is provided with several spiral circular through holes with a cross-section that is wide at both ends and narrow in the middle; a water saver (5) is provided below the water distribution plate (4).

4. A water-saving filter according to claim 1 or 2, characterized in that: The upper housing (1) has an upper limit protrusion (13) inside, which abuts against the filter cover (31); the lower housing (2) has a lower limit protrusion (23) inside, which abuts against the upper housing (1).

5. A water-saving filter according to claim 1, characterized in that: The upper housing (1) is provided with an outer flange (14), which forms a smooth connection surface with the lower housing (2).

6. A water-saving filter according to claim 4, characterized in that: The filter element cover (31) is detachably connected to the filter element cylinder (3).

7. A water-saving filter according to claim 4, characterized in that: The upper limit protrusion (13) forms an upper limit groove (131) with the inner wall of the upper housing (1), and an upper sealing ring (6) is provided in the upper limit groove (131); the lower limit protrusion (23) forms a lower limit groove (231) with the inner wall of the lower housing (2), and a lower sealing ring (7) is provided in the lower limit groove (231).

8. A water-saving filter according to claim 6, characterized in that: The bottom of the filter cartridge (3) is provided with several filter ports (33); the top of the filter cover (31) is a mesh structure; the inside of the filter cartridge (3) is provided with several partition layers, and the filter material (32) is laid layer by layer inside the filter cartridge (3).

9. A water-saving filter according to claim 1, characterized in that: The inner ring of the inlet (11) is threaded and is connected to the inlet pipe by the thread; the outer ring of the outlet (21) is threaded and is connected to the outlet pipe by the thread.

10. A water-saving filter according to claim 9, characterized in that: The inlet (11) is provided with a sealing gasket (8) at the threaded bottom end.

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