A replaceable filter cartridge structure

Abstract

The utility model provides a replaceable filter core structure, including inlet pipe, the bottom of one side of inlet pipe is provided with blowoff branch pipe, and is installed with the valve on the blowoff branch pipe, the bottom end inside inlet pipe is installed with the primary filter subassembly, and the bottom of inlet pipe is connected with the filter tube through first connecting sleeve. Compared with prior art, the utility model has the beneficial effects as follows: the application is through the unique thread connection cooperation multiple sealing design, such as the first sealing cavity and first sealing rubber ring between first connecting sleeve and inlet pipe, the second sealing cavity and second sealing rubber ring between second connecting sleeve and filter tube, and the adaptive design of the compression ring of mounting sleeve and second sealing cavity, forms multilayer sealing protection system, when facing water flow pressure change and equipment vibration, still can keep close fitting, effectively avoids sealing part displacement, deformation, eliminates the risk of water leakage, greatly guarantees equipment operation safety and stability, reduces water resource waste and equipment failure hidden danger.

Description

Technical Field

[0001] This utility model relates to a replaceable filter element structure and belongs to the field of filtration equipment. Background Technology

[0002] Against the backdrop of increasingly urgent global demands for water resource protection and recycling, water treatment technology serves as the core support for ensuring water quality safety and achieving sustainable water resource utilization. The performance of its key equipment—filtration devices—directly affects the operational efficiency and application value of the entire water treatment system. With the continuous increase in water quality standards from various fields such as industrial production and residential life, the development of refined and efficient filtration equipment has become an inevitable trend.

[0003] Existing replaceable filter cartridge filtration equipment typically uses a simple threaded connection to connect the filter cartridge to the main body of the equipment. However, such structures usually rely solely on a single plane seal or a common rubber ring seal. In actual use, due to changes in water pressure and equipment vibration, the sealing components are prone to displacement and deformation, leading to gaps at the connection and causing leakage. Many traditional filtration devices do not have a pre-filtration device, allowing large particles of impurities such as silt, rust, and suspended solids in the raw water to directly enter the main filter cartridge, adhere to its surface, and quickly clog the filtration channels, significantly reducing filtration efficiency. The main filter cartridge bears the entire filtration work, resulting in an excessive load, accelerated wear, and a significantly shortened service life, requiring frequent replacement and increasing maintenance costs and operational difficulty. In addition, some filtration equipment with a pre-filtration structure lacks an automatic cleaning mechanism, allowing impurities to accumulate on the filter screen during use, making it extremely easy to clog. Users can only periodically disassemble the equipment for manual cleaning, which is time-consuming and labor-intensive. Therefore, designing a replaceable filter cartridge structure is essential. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a replaceable filter structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a replaceable filter element structure, including a water inlet pipe, a sewage branch pipe provided at the bottom of one side of the water inlet pipe, and a valve installed on the sewage branch pipe, a pre-filter assembly installed at the bottom of the inside of the water inlet pipe, and a filter pipe connected to the bottom of the water inlet pipe through a first connecting sleeve, a filter element provided inside the filter pipe, and a second connecting sleeve threaded to the bottom of the filter pipe, an outlet pipe penetrating through the center of the second connecting sleeve, and an installation sleeve provided between the outlet pipe and the inner sidewall of the second connecting sleeve.

[0006] Furthermore, the bottom of the water inlet pipe is provided with a first protruding flange, and the outer diameter of the first flange matches the outer diameter of the first connecting sleeve. The bottom of the first flange is provided with a first threaded sleeve, and the inner sidewall of the first connecting sleeve is provided with an internal thread that matches the external thread on the surface of the first threaded sleeve. The inner diameter of the first threaded sleeve matches the outer diameter of the filter pipe.

[0007] Furthermore, the first connecting sleeve and the filter tube are integrally molded, and the top of the first connecting sleeve is flush with the top of the filter tube. An annular first sealing cavity is formed between the first connecting sleeve and the filter tube, and a first sealing ring is bonded to the bottom of the first sealing cavity. The shape of the first sealing cavity matches the first threaded sleeve.

[0008] Furthermore, the bottom of the filter tube is integrally connected with an outwardly protruding second flange, and the bottom of the second flange is integrally connected with a second threaded sleeve. The inner surface of the second connecting sleeve is provided with an internal thread that matches the external thread on the surface of the second threaded sleeve. A second sealing cavity is formed between the second connecting sleeve and the water outlet pipe, and a second sealing rubber ring is bonded to the bottom of the second sealing cavity.

[0009] Furthermore, the mounting sleeve includes an integrally formed pressure ring, a sleeve, and an inner ring, and the inner diameter of the sleeve matches the outer diameter of the water outlet pipe. An inner ring is provided at the center of the inner wall of the sleeve, and a pressure ring is integrally connected to the bottom end of the sleeve. A filter element is provided at the top of the inner ring, and the filter element is bonded to the inner wall of the sleeve. The shape of the pressure ring matches the second sealing cavity, and a third sealing rubber ring is bonded to the upper surface of the pressure ring. The inner wall of the second threaded sleeve fits against the outer wall of the sleeve, and the bottom of the second threaded sleeve abuts against the third sealing rubber ring.

[0010] Furthermore, the primary filtration assembly includes a cleaning structure and a filter cartridge. The cleaning structure includes a cleaning frame, a rotating rod, and a spiral impeller. A filter screen is provided at the top of the filter cartridge, and a through hole is provided at the center of the filter screen. A rotating rod passes through the through hole and is rotatably connected to the through hole. A cleaning frame is installed on the rotating rod at the top of the filter screen, and a spiral impeller is installed on the rotating rod below the filter screen.

[0011] Furthermore, the cleaning rack is designed in a "U" shape, with the filter screen flush with the sewage branch pipe, the bottom of the horizontal bar of the cleaning rack fitting with the top of the filter screen, and both vertical bars of the cleaning rack fitting with the inner wall of the water inlet pipe.

[0012] Furthermore, the primary filter assembly also includes symmetrically arranged card holders at the bottom of both sides of the filter cartridge, and a notch is provided at the center of the bottom of the card holder. A sliding groove is provided at the top of the card holder, and an opening is designed at the position of the sliding groove on the side of the card holder away from the filter cartridge. A limit block is installed in the sliding groove by means of a return spring, and the limit block is designed in an inverted "L" shape. The horizontal part of the limit block extends out of the opening under the action of the return spring, and a lever block extending into the notch is integrally connected to the bottom of the vertical part of the limit block. Card slots matching the shape of the card holder are provided on both sides of the bottom of the first stop, and a limit groove matching the shape of the end of the limit block extending out of the opening is provided on the side of the card slot away from the center of the first stop.

[0013] The beneficial effects of this utility model are:

[0014] 1. Unlike the simple sealing methods of existing equipment using a single plane or ordinary rubber rings, this application uses a unique threaded connection combined with a multi-layer sealing design, such as a first sealing cavity and a first sealing ring between the first connecting sleeve and the water inlet pipe, a second sealing cavity and a second sealing ring between the second connecting sleeve and the filter pipe, and a matching design between the pressure ring of the mounting sleeve and the second sealing cavity, forming a multi-layer sealing protection system. Even when facing changes in water flow pressure and equipment vibration, it can still maintain a tight fit, effectively preventing the displacement and deformation of sealing components, eliminating the risk of water leakage, greatly ensuring the safety and stability of equipment operation, and reducing water waste and potential equipment failure.

[0015] 2. The pre-filtration component is set up to pre-filter the raw water, effectively intercepting large particles of impurities such as silt and rust, reducing the filtration burden on the main filter element. The filter screen in the pre-filtration component, together with the automatic cleaning structure, uses a spiral impeller driven by the water flow to rotate the rotating rod and cleaning frame, continuously cleaning impurities on the surface of the filter screen, preventing clogging, maintaining a high-efficiency pre-filtration effect, allowing the filter element to operate in a more relaxed working environment, with stable filtration efficiency, significantly extended service life, reduced replacement frequency, reduced maintenance costs and operational complexity, and ensuring continuous and stable operation of the equipment.

[0016] 3. The overall structure adopts a modular design. The inlet pipe, filter pipe, and second connecting sleeve are all connected by threads, making disassembly and assembly convenient. No complicated tools or cumbersome operations are required when replacing the filter element, reducing maintenance difficulty and time costs. The pre-filter component is quickly installed and fixed to the inlet pipe through structures such as clamps and limit blocks, making disassembly and cleaning convenient. The automatic cleaning structure reduces the frequency of manual cleaning, significantly improving maintenance convenience and equipment lifespan. Attached Figure Description

[0017] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0018] Figure 1This is a structural diagram of a replaceable filter element structure according to the present invention;

[0019] Figure 2 This is a cross-sectional structural diagram of a replaceable filter element structure according to the present invention;

[0020] Figure 3 This is a cross-sectional view of a replaceable filter element structure according to the present invention.

[0021] Figure 4 This is a schematic diagram of a pre-filter assembly with a replaceable filter element structure according to the present invention.

[0022] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle.

[0023] In the diagram: 1. Inlet pipe; 101. First retaining edge; 102. First threaded sleeve; 2. Drainage branch pipe; 3. Valve; 4. First connecting sleeve; 401. First sealing cavity; 402. First sealing ring; 5. Filter pipe; 501. Second retaining edge; 502. Second threaded sleeve; 6. Second connecting sleeve; 601. Second sealing cavity; 602. Second sealing ring; 7. Outlet pipe; 8. Filter element; 9. Mounting sleeve; 901. Pressure ring; 902. Sleeve 903. Inner ring; 904. Third sealing ring; 10. Primary filter assembly; 11. Slot; 1101. Limiting slot; 12. Cleaning structure; 1201. Cleaning frame; 1202. Rotating rod; 1203. Spiral impeller; 13. Filter cartridge; 1301. Filter screen; 1302. Through hole; 14. Slot; 1401. Notched groove; 1402. Sliding groove; 1403. Opening; 15. Limiting block; 1501. Pushing block; 16. Return spring. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] Please see Figures 1 to 5This utility model provides a technical solution: a replaceable filter element structure, including an inlet pipe 1, a drain branch pipe 2 at the bottom of one side of the inlet pipe 1, and a valve 3 installed on the drain branch pipe 2. A primary filter element 10 is installed at the bottom of the inlet pipe 1, and a filter pipe 5 is connected to the bottom of the inlet pipe 1 through a first connecting sleeve 4. A filter element 8 is installed inside the filter pipe 5, and a second connecting sleeve 6 is threaded to the bottom of the filter pipe 5. An outlet pipe 7 is installed through the center of the second connecting sleeve 6, and an installation sleeve 9 is installed between the outlet pipe 7 and the inner side wall of the second connecting sleeve 6. The drain branch pipe 2 and the valve 3 are provided at the bottom of one side of the inlet pipe 1, which realizes the convenient discharge of impurities during the filtration process. Large particles of impurities intercepted by the primary filter element 10 can be discharged without disassembling the equipment, reducing the burden of manual cleaning and improving the continuous working capacity of the filtration system. All components are connected by threads. When it is necessary to replace the filter element 8 or to repair the filter pipe 5, primary filter element 10, etc., the disassembly and assembly process is simple and does not require professional tools, which reduces the maintenance difficulty and time cost and improves the equipment maintenance efficiency.

[0026] For example, the bottom of the water inlet pipe 1 is provided with an outwardly protruding first retaining edge 101, and the outer diameter of the first retaining edge 101 matches the outer diameter of the first connecting sleeve 4. The bottom of the first retaining edge 101 is provided with a first threaded sleeve 102, and the inner side wall of the first connecting sleeve 4 is provided with an internal thread that matches the external thread on the surface of the first threaded sleeve 102. The inner diameter of the first threaded sleeve 102 matches the outer diameter of the filter pipe 5, and the outer diameter of the first retaining edge 101 matches the outer diameter of the first connecting sleeve 4, forming an annular matching surface to ensure the coaxiality of the water inlet pipe 1 and the filter pipe 5, and to avoid sealing failure due to eccentricity. The threaded engagement between the first threaded sleeve 102 and the first connecting sleeve 4 provides radial and axial dual constraints, making the connection more stable and effectively resisting loosening caused by water flow impact and vibration.

[0027] For example, the first connecting sleeve 4 and the filter tube 5 are integrally molded, and the top of the first connecting sleeve 4 and the filter tube 5 are flush. An annular first sealing cavity 401 is formed between the first connecting sleeve 4 and the filter tube 5, and a first sealing ring 402 is bonded to the bottom of the first sealing cavity 401. The shape of the first sealing cavity 401 matches the first threaded sleeve 102. The matching design of the annular first sealing cavity 401 and the first threaded sleeve 102 forms an embedded sealing structure. When the water inlet pipe 1 and the filter tube 5 are tightened by the threads, the first sealing ring 402 is uniformly compressed in the sealing cavity, avoiding the local leakage problem caused by the bias pressure that is easy to occur in traditional planar seals. This design can maintain a continuous and stable sealing effect when subjected to dynamic water pressure changes.

[0028] Please see Figure 3The bottom of the filter tube 5 is integrally connected to an outwardly protruding second flange 501, and the bottom of the second flange 501 is integrally connected to a second threaded sleeve 502. The inner surface of the second connecting sleeve 6 is provided with an internal thread that matches the external thread of the second threaded sleeve 502. A second sealing cavity 601 is formed between the second connecting sleeve 6 and the water outlet tube 7. A second sealing ring 602 is bonded to the bottom of the second sealing cavity 601. The bottom of the filter tube 5 is threadedly engaged with the second connecting sleeve 6 through the second flange 501, the second threaded sleeve 502, and the second sealing sleeve 6. Combined with the design of the second sealing cavity 601 and the second sealing ring 602, a double sealing guarantee is formed. The thread matching between the second threaded sleeve 502 and the second connecting sleeve 6 makes the disassembly and installation of components such as the water outlet tube 7 and the mounting sleeve 9 simple and easy. The filter element 8 can be replaced and the equipment can be repaired without the need for special tools.

[0029] Please see Figure 2 and Figure 3 The mounting sleeve 9 includes an integrally formed pressure ring 901, a sleeve 902, and an inner ring 903. The inner diameter of the sleeve 902 matches the outer diameter of the outlet pipe 7. The inner ring 903 is located at the center of the inner wall of the sleeve 902, and the pressure ring 901 is integrally connected to the bottom end of the sleeve 902. A filter element 8 is located at the top of the inner ring 903 and is bonded to the inner wall of the sleeve 902. The shape of the pressure ring 901 matches the second sealing cavity 601, and a third sealing ring 904 is bonded to the upper surface of the pressure ring 901. The inner wall of the second threaded sleeve 502 fits against the outer wall of the sleeve 902, and the second threaded sleeve 502... The bottom of sleeve 502 is pressed against the third sealing ring 904. The mounting sleeve 9, through the matching design of the pressure ring 901 and the second sealing cavity 601, together with the second sealing ring 602 and the third sealing ring 904 on the upper surface of the pressure ring 901, forms a triple protection of double planar seal and one annular seal. When the second threaded sleeve 502 is tightened, the third sealing ring 904 is deformed under pressure to fill the gap, and works in synergy with the second sealing ring 602 to effectively resist the impact of water flow pressure and equipment vibration. Compared with the traditional single sealing structure, it greatly improves the sealing reliability of the water outlet pipe 7 connection and eliminates the risk of leakage.

[0030] Please see Figure 3 and Figure 4The primary filtration assembly 10 includes a cleaning structure 12 and a filter cartridge 13. The cleaning structure 12 includes a cleaning frame 1201, a rotating rod 1202, and a spiral impeller 1203. A filter screen 1301 is provided on the top of the filter cartridge 13, and a through hole 1302 is provided in the center of the filter screen 1301. The rotating rod 1202 passes through the through hole 1302 and is rotatably connected to the through hole 1302. The cleaning frame 1201 is installed on the rotating rod 1202 at the top of the filter screen 1301, and the filter screen 1301 is located below... A spiral impeller 1203 is installed on the square rotating rod 1202. The primary filter assembly 10 drives the rotating rod 1202 to rotate under the impact of water flow through the spiral impeller 1203, which in turn drives the cleaning frame 1201 to continuously clean the surface of the filter screen 1301. This automatic cleaning mechanism can remove the intercepted mud, sand, rust and other impurities in a timely manner, avoid the filter screen 1301 from clogging, and ensure the continuous and efficient operation of the primary filtration process. At the same time, the filter screen 1301 intercepts large particulate pollutants, which can reduce the filtration burden of the filter element 8 and extend its service life.

[0031] Please see Figure 2 and Figure 4 The cleaning rack 1201 has a U-shaped design, and the filter screen 1301 is flush with the drain branch pipe 2. The bottom of the horizontal bar of the cleaning rack 1201 is attached to the top of the filter screen 1301, and the two vertical bars of the cleaning rack 1201 are attached to the inner wall of the water inlet pipe 1. The bottom of the horizontal bar is attached to the top of the filter screen 1301. When rotating, it can thoroughly remove impurities on the filter screen 1301. The two vertical bars are attached to the inner wall of the water inlet pipe 1, which scrapes off the impurities attached to the inner wall of the water inlet pipe 1 while cleaning the filter screen 1301, preventing secondary pollution. The design of the filter screen 1301 being flush with the drain branch pipe 2, combined with the centrifugal force generated by the rotation of the cleaning rack 1201, makes it easier for the removed impurities to enter the drain branch pipe 2, improving the sewage discharge effect.

[0032] Please see Figure 4 and Figure 5The primary filter assembly 10 also includes symmetrically arranged brackets 14 at the bottom of both sides of the filter cartridge 13. A notch 1401 is provided at the center of the bottom of the bracket 14, and a sliding groove 1402 is provided at the top of the bracket 14. An opening 1403 is designed on the side of the bracket 14 away from the filter cartridge 13 corresponding to the position of the sliding groove 1402. A limiting block 15 is installed in the sliding groove 1402 via a return spring 16. The limiting block 15 is designed in an inverted "L" shape. The horizontal part of the limiting block 15 extends out of the opening 1403 under the action of the return spring 16, and the bottom of the vertical part of the limiting block 15 is integrally connected to a part that extends into the notch 1401. The push block 1501 has two slots 11 on both sides of the bottom of the first stop 101 that match the shape of the card seat 14. The side of the slot 11 away from the center of the first stop 101 has a limiting groove 1101 that matches the shape of the end of the limiting block 15 that protrudes from the opening 1403. During installation, the card seat 14 is aligned with the slot 11 and inserted. Under the action of the return spring 16, the limiting block 15 automatically engages with the limiting groove 1101, forming a firm connection. No additional tools are required. During disassembly, simply press the push block 1501 of the limiting block 15 inward to disengage it from the limiting groove 1101, and the primary filter component 10 can be easily removed.

[0033] Detailed implementation method: In use, the water to be filtered flows in from the inlet pipe 1 and first passes through the pre-filtration component 10. The water flow impacts the spiral impeller 1203, which drives the rotating rod 1202 to rotate. The cleaning frame 1201 rotates synchronously, continuously cleaning the filter screen 1301. The impurities intercepted are discharged through the drain branch pipe 2, which is flush with the filter screen 1301, under the action of centrifugal force, thus avoiding clogging of the filter screen 1301. The water that has passed through the pre-filtration enters the filter pipe 5 and completes deep filtration under the action of the filter element 8. The filter element 8 is installed in the mounting sleeve 9 and is limited by the inner ring 903. The sleeve 902 fits with the water outlet pipe 7, and the pressure ring 901 cooperates with the second sealing cavity 601. When the second threaded sleeve 502 is tightened with the second connecting sleeve 6, the second sealing ring 602 and the third sealing ring 904 are compressed to form a triple seal, ensuring that the filtered water flows stably through the water outlet pipe 7. The water inlet pipe 1 is threadedly tightened with the first connecting sleeve 4 through the first threaded sleeve 102. The first sealing ring 402 is compressed in the first sealing cavity 401 to ensure the sealing of the water inlet pipe 1 and the filter pipe 5. The card seat 14 of the primary filter assembly 10 and the card slot 11 of the water inlet pipe 1 can be quickly disassembled and assembled through the limiting block 15 and the return spring 16, which is convenient for maintenance.

[0034] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A replaceable filter element structure, comprising an inlet pipe (1), characterized in that: A sewage branch pipe (2) is provided at the bottom of one side of the water inlet pipe (1), and a valve (3) is installed on the sewage branch pipe (2). A primary filter assembly (10) is installed at the bottom inside the water inlet pipe (1), and a filter pipe (5) is connected to the bottom of the water inlet pipe (1) through a first connecting sleeve (4). A filter element (8) is provided inside the filter pipe (5), and a second connecting sleeve (6) is threaded to the bottom of the filter pipe (5). A water outlet pipe (7) is provided through the center of the second connecting sleeve (6), and an installation sleeve (9) is provided between the water outlet pipe (7) and the inner wall of the second connecting sleeve (6). The primary filter assembly (10) includes a cleaning structure (12) and a filter cartridge (13). The cleaning structure (12) includes a cleaning frame (1201), a rotating rod (1202), and a spiral impeller (1203). A filter screen (1301) is provided on the top of the filter cartridge (13), and a through hole (1302) is provided at the center of the filter screen (1301). The rotating rod (1202) passes through the through hole (1302), and the rotating rod (1202) is rotatably connected to the through hole (1302). The cleaning frame (1201) is installed on the rotating rod (1202) at the top of the filter screen (1301), and a spiral impeller (1203) is installed on the rotating rod (1202) below the filter screen (1301).

2. The replaceable filter element structure according to claim 1, characterized in that: The bottom of the water inlet pipe (1) is provided with an outwardly protruding first flange (101), and the outer diameter of the first flange (101) matches the outer diameter of the first connecting sleeve (4). The bottom of the first flange (101) is provided with a first threaded sleeve (102), and the inner sidewall of the first connecting sleeve (4) is provided with an internal thread that matches the external thread on the surface of the first threaded sleeve (102). The inner diameter of the first threaded sleeve (102) matches the outer diameter of the filter pipe (5).

3. The replaceable filter element structure according to claim 1, characterized in that: The first connecting sleeve (4) and the filter tube (5) are integrally molded, and the top of the first connecting sleeve (4) and the filter tube (5) are flush. An annular first sealing cavity (401) is formed between the first connecting sleeve (4) and the filter tube (5), and a first sealing ring (402) is bonded to the bottom of the first sealing cavity (401). The shape of the first sealing cavity (401) matches the first threaded sleeve (102).

4. The replaceable filter element structure according to claim 1, characterized in that: The bottom of the filter tube (5) is integrally connected with an outwardly protruding second flange (501), and the bottom of the second flange (501) is integrally connected with a second threaded sleeve (502). The inner surface of the second connecting sleeve (6) is provided with an internal thread that matches the external thread of the second threaded sleeve (502). A second sealing cavity (601) is formed between the second connecting sleeve (6) and the water outlet pipe (7). A second sealing ring (602) is bonded to the bottom of the second sealing cavity (601).

5. The replaceable filter element structure according to claim 4, characterized in that: The installation sleeve (9) includes an integrally formed pressing ring (901), a sleeve (902) and an inner ring (903). The inner diameter of the sleeve (902) matches the outer diameter of the water outlet pipe (7). An inner ring (903) is provided at the central position of the inner wall of the sleeve (902), and the bottom end of the sleeve (902) is integrally connected to the pressing ring (901). A filter element (8) is provided at the top of the inner ring (903), and the filter element (8) is adhesively bonded to the inner wall of the sleeve (902). The shape of the pressing ring (901) matches the second sealing cavity (601), and a third sealing rubber ring (904) is adhesively bonded to the upper surface of the pressing ring (901). The inner wall of the second threaded sleeve (502) fits against the outer wall of the sleeve (902), and the bottom of the second threaded sleeve (502) abuts against the third sealing rubber ring (904).

6. The replaceable filter element structure according to claim 1, characterized in that: The cleaning frame (1201) is designed in a "U" shape, and the filter screen (1301) is flush with the sewage branch pipe (2). The bottom of the crossbar of the cleaning frame (1201) fits against the top of the filter screen (1301), and both vertical bars of the cleaning frame (1201) fit against the inner side wall of the water inlet pipe (1).

7. The replaceable filter element structure according to claim 2, characterized in that: The primary filtration component (10) further includes card seats (14) symmetrically arranged at the two bottom sides of the filter cylinder (13). A notch (1401) is provided at the central position of the inner bottom end of the card seat (14). A sliding groove (1402) is formed at the top end inside the card seat (14), and an opening (1403) is designed at the position corresponding to the sliding groove (1402) on the side of the card seat (14) away from the filter cylinder (13). A limiting block (15) is installed in the sliding groove (1402) through a return spring (16), and the limiting block (15) is designed in an inverted "L" shape. The horizontal part of the limiting block (15) extends out of the opening (1403) under the action of the return spring (16), and the bottom end of the vertical part of the limiting block (15) is integrally connected to a dialing block (1501) extending into the notch (1401). Slots (11) matching the shape of the card seat (14) are formed on both sides of the bottom of the first retaining edge (101), and limiting slots (1101) matching the shape of the end of the limiting block (15) extending out of the opening (1403) are formed on the side of the slot (11) inside away from the center of the first retaining edge (101).

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