A Y-type filter fitting

Abstract

This utility model relates to the technical field of water supply pipeline transportation systems, and more specifically, to a Y-type filter pipe fitting, including a Y-type pipe body, a filter element, and a fixing component. The Y-type pipe body includes a direct pipe and a branch pipe, which are connected. The filter element is installed inside the branch pipe and divides the direct pipe into an inlet section and an outlet section. The interior of the filter element is connected to both the inlet and outlet sections. A flexible filter cartridge is provided on the inner wall of the filter element. A partition is provided between the direct pipe and the branch pipe, and the partition has a water passage hole connecting the flexible filter cartridge and the inlet section. The fixing component includes an abutting convex ring and a filter cartridge connecting part provided on the abutting convex ring. The bottom surface of the abutting convex ring abuts against the partition, and the top surface of the abutting convex ring abuts against the bottom end face of the filter element. The filter cartridge connecting part forms an installation groove with the inner wall of the filter element, and the installation groove is interference-fitted with the flexible filter cartridge. The filter of this utility model is compatible with filter cartridges made of flexible filter screens of different materials and mesh sizes.

Description

Technical Field

[0001] This utility model relates to the technical field of water supply pipeline transportation systems, and more specifically, to a Y-type filter fitting. Background Technology

[0002] In pipeline transportation systems, Y-type filters serve as critical filtration devices, ensuring the safe operation of pipeline equipment by intercepting impurities in the medium. PVC materials are widely used in acid and alkali media transportation applications due to their corrosion resistance and lightweight properties. Traditional PVC Y-type filters typically employ injection-molded cylindrical filter screen assemblies. Axial fixation is achieved through a one-piece molded cylindrical boss cooperating with a limiting platform on the filter's inner wall, while circumferentially distributed reinforcing frames suppress filter screen deformation. While this structure achieves stable filtration, the filter screen specifications are limited by the mold design. Adjusting the filter mesh size or replacing the filter media requires re-molding, resulting in high production costs, long lead times, and difficulty in adapting to diverse operating conditions.

[0003] In recent years, flexible filter materials (such as metal wire mesh and nylon filter cloth) have gradually gained attention due to their advantages such as high customizability and low cost. We attempted to replace injection-molded filter screens by rolling and welding commercially available flexible filter cloths into a cylindrical structure, but significant defects were exposed in practical applications: flexible filter screens lack a rigid positioning structure and cannot form the boss features of injection-molded filter screens. This causes the filter cartridge to easily slide axially or shift circumferentially under the impact of fluid after installation. Especially when the medium pressure fluctuates or during backwashing, the filter screen is prone to detaching from the limiting platform, causing problems such as sealing failure and impurity bypass. Utility Model Content

[0004] The purpose of this utility model is to overcome the difficulty of compatibility between existing filters and flexible filter screens of different materials and mesh sizes, and to achieve reliable installation and fixation, by providing a Y-type filter fitting.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A Y-type filter fitting is provided, comprising a Y-shaped pipe body and a filter element. The Y-shaped pipe body includes a direct current pipe and a branch pipe, the direct current pipe communicating with the branch pipe. The filter element is installed inside the branch pipe and divides the direct current pipe into an inlet section and an outlet section. The interior of the filter element is connected to both the inlet section and the outlet section. A flexible filter cartridge is provided on the inner wall of the filter element. A fixing member is also included. A partition is provided between the direct current pipe and the branch pipe. The partition has a water passage hole communicating with the flexible filter cartridge and the inlet section. The fixing member includes an abutting protrusion ring and a filter cartridge connecting portion provided on the abutting protrusion ring. The bottom surface of the abutting protrusion ring abuts against the partition plate, and the top surface of the abutting protrusion ring abuts against the bottom end face of the filter element. The filter cartridge connecting portion forms an installation groove with the inner wall of the filter element, and the installation groove is interference-fitted with the flexible filter cartridge.

[0007] During the operation of the above scheme, after the medium flows in from the inlet section of the DC pipe, it enters the branch pipe through the water passage on the baffle and enters the filter element cavity from the bottom of the filter element. The fluid penetrates the mesh of the flexible filter cartridge (made of commercially available filter cloth rolled into a cylindrical shape and then formed into a stable cylinder by ultrasonic welding), while impurities are trapped in the flexible filter cartridge. The clean medium flows through the inner cavity of the flexible filter cartridge to the outlet section of the DC pipe and is finally discharged from the DC pipe. During the process of the fluid entering and exiting the filter element, it impacts the flexible filter cartridge. The bottom and top surfaces of the fixing member's abutting convex ring are tightly abutted against the plane of the baffle plate inside the DC pipe and the end face of the filter element, respectively, forming a rigid support reference (ensuring that it will not undergo axial displacement under the action of fluid thrust). The flexible filter cartridge is inserted into the mounting groove with an interference fit. The flexible filter cartridge undergoes elastic deformation, forming a radial clamping force with the outer wall of the filter cartridge connection and the inner wall of the filter element. At the same time, the radial clamping force can generate axial and circumferential frictional forces. The frictional force of mechanical hard contact counteracts the axial thrust generated by the fluid pressure, effectively preventing the flexible filter cartridge from undergoing axial displacement and circumferential rotational offset under the fluid thrust, thus achieving reliable installation of the non-injection molded filter screen.

[0008] Furthermore, the fixing member is annular and includes an intermediate connecting part. The two ends of the intermediate connecting part are respectively connected to the abutting protrusion ring and the filter cartridge connecting part. The outer wall of the intermediate connecting part abuts against the inner wall of the filter element. The filter cartridge connecting part should form an installation groove with the inner wall of the filter element to stably press the flexible filter cartridge. The fixing member should first form a tight fit with the inner wall of the filter element, and the outer wall of the intermediate connecting part should fit tightly with the inner wall of the filter element. The width of the installation groove can be small enough to allow for an interference fit with the flexible filter cartridge.

[0009] Furthermore, the outer diameter of the filter cartridge connecting part is smaller than the outer diameter of the intermediate connecting part, the filter cartridge connecting part is conical, and the outer diameter of the top end of the filter cartridge connecting part is smaller than the outer diameter of the bottom end; the mounting groove formed by the filter cartridge connecting part and the inner wall of the filter element has a specific taper, which abuts against the flexible filter cartridge from loose to tight, the whole fit is tight, and it is easy to disassemble. At the same time, the flexible filter cartridges made of flexible filter screens of different thicknesses can be adapted to the mounting groove.

[0010] Furthermore, the taper of the outer wall of the filter cartridge connection is between 7° and 10°. Through actual production testing, the taper of the mounting groove cannot be too large, otherwise the interference fit will fail, nor can it be too small, otherwise it will be inconvenient to install. The optimal taper of the mounting groove is formed when the taper of the outer wall of the filter cartridge connection is between 7° and 10°.

[0011] Furthermore, the filter element includes an installation head and a filter cartridge installation part. The installation head is threadedly connected to the branch pipe, and the flexible filter cartridge is installed in the filter cartridge installation part. The filter element adopts a threaded connection installation form, and the top end of the branch pipe is provided with an internal thread. During installation and disassembly, the installation head can be rotated, which is simple to operate.

[0012] Furthermore, the outer wall of the filter cartridge mounting part is provided with a number of limiting ribs and hollow parts. The hollow parts are formed by the circumferential and axial staggered arrangement of the limiting ribs. By adopting the form of limiting ribs, the filter cartridge mounting part of the filter element can both achieve radial limiting of the flexible filter cartridge and realize the connection between the filter element and the DC pipe.

[0013] Furthermore, the outer wall of the intermediate connecting part is provided with a plurality of axial ribs distributed circumferentially, and the limiting ribs are located between two adjacent axial ribs; the wall surface of the filter cartridge mounting part is composed of a plurality of interlaced limiting ribs, and the formation of the hollow part makes it difficult to fix the entire fastener circumferentially. On the intermediate connecting part, the axial ribs are used to lock the axially arranged limiting ribs through two adjacent axial ribs, thereby forming circumferential fixation.

[0014] Furthermore, a stepped portion is provided on the inner wall of the filter cartridge mounting part near the mounting head, and the stepped portion abuts against the flexible filter cartridge; the stepped portion abuts against the flexible filter cartridge at the end away from the fixing member, so as to prevent the flexible filter cartridge from axially sliding and shifting when the impact force is too large or the interference fit connection fails.

[0015] Furthermore, it also includes a first sealing ring and a second sealing ring. A sealing groove is provided at one end of the filter cartridge mounting part near the mounting head. The first sealing ring is installed in the sealing groove, and the second sealing ring is installed between the mounting head and the abutting end face of the branch pipe. There is a gap between the inner wall of the branch pipe and the outer wall of the filter cartridge mounting part. The first sealing ring and the second sealing ring are provided to prevent fluid from leaking from the opening of the branch pipe.

[0016] Furthermore, it also includes a socket connector, which is installed at the opening of the inlet section and the outlet section; the socket connector is used to connect the external pipeline to the opening of the inlet section and the outlet section and to provide an effective seal.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The fixing component includes an abutting protrusion ring on the bottom outer wall and a filter cartridge connecting part on the top; the bottom surface of the abutting protrusion ring abuts against the partition plate, and the top surface abuts against the end face of the bottom of the filter element; the filter cartridge connecting part forms an installation groove with the inner wall of the filter element, and the installation groove is interference-fitted with the flexible filter cartridge. In use, commercially available flexible filter screens can be directly made into flexible filter cartridges, and a rigid support reference is formed by the fixing component. Axial and circumferential limiting friction forces are formed in the installation groove, realizing reliable installation of non-injection molded filter screens.

[0019] 2. The outer wall of the filter cartridge mounting part is composed of several limiting ribs. At the same time, the interlaced limiting ribs can also form a hollow part, which can both achieve radial limiting of the flexible filter cartridge and realize the connection between the filter element and the DC tube. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the internal structure of a Y-type filter fitting;

[0021] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0022] Figure 3 This is a schematic diagram of the structure of a Y-type filter element;

[0023] Figure 4 A schematic diagram of the structure of a flexible filter cartridge for a Y-type filter fitting;

[0024] Figure 5 This is a schematic diagram of the internal structure of a fixing component for a Y-type filter pipe fitting;

[0025] Figure 6 This is a top view of a fixing component for a Y-type filter pipe fitting.

[0026] In the attached diagram: 100, filter element; 110, mounting head; 111, sealing groove; 120, filter cartridge mounting part; 121, limiting rib; 122, hollow part; 123, stepped part; 200, direct current pipe; 210, water inlet section; 220, water outlet section; 230, baffle plate; 231, water passage hole; 300, branch pipe; 400, flexible filter cartridge; 500, fixing part; 510, abutting protrusion ring; 520, filter cartridge connecting part; 530, mounting groove; 540, intermediate connecting part; 541, axial rib; 600, first sealing ring; 700, second sealing ring; 800, socket connector. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0028] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] Example 1

[0030] This embodiment is a first embodiment of a Y-type filter fitting, such as... Figures 1 to 2As shown, the device includes a Y-shaped pipe body and a filter element 100. The Y-shaped pipe body includes a direct current pipe 200 and a branch pipe 300, which are connected. The filter element 100 is installed inside the branch pipe 300 and divides the direct current pipe 200 into an inlet section 210 and an outlet section 220. The interior of the filter element 100 is connected to both the inlet section 210 and the outlet section 220. A flexible filter cartridge 400 is provided on the inner wall of the filter element 100. The device also includes a fixing member 500. A partition is provided between the direct current pipe 200 and the branch pipe 300. The plate 230 has a water passage hole 231 that connects the flexible filter cartridge 400 and the water inlet section 210. The fixing member 500 includes an abutting protrusion ring 510 and a filter cartridge connecting part 520 provided on the abutting protrusion ring 510. The bottom surface of the abutting protrusion ring 510 abuts against the partition plate 230, and the top surface of the abutting protrusion ring 510 abuts against the end face of the bottom of the filter element 100. The filter cartridge connecting part 520 and the inner wall of the filter element 100 form an installation groove 530, and the installation groove 530 is interference-fitted with the flexible filter cartridge 400.

[0031] Specifically, such as Figure 5 As shown, the fixing member 500 is annular and includes an intermediate connecting part 540. The two ends of the intermediate connecting part 540 are respectively connected to the abutting protrusion ring 510 and the filter cartridge connecting part 520. The outer wall of the intermediate connecting part 540 abuts against the inner wall of the filter element 100. The filter cartridge connecting part 520 is to form an installation groove 530 with the inner wall of the filter element 100 to stably press the flexible filter cartridge 400. The fixing member 500 must first form a tight fit with the inner wall of the filter element 100. The outer wall of the intermediate connecting part 540 is in tight fit with the inner wall of the filter element 100. The width of the installation groove 530 can be small enough to allow for an interference fit with the flexible filter cartridge 400.

[0032] Specifically, the outer diameter of the filter cartridge connecting part 520 is smaller than the outer diameter of the intermediate connecting part 540. The filter cartridge connecting part 520 is tapered, and the outer diameter of the top end of the filter cartridge connecting part 520 is smaller than the outer diameter of the bottom end. The mounting groove 530 formed by the filter cartridge connecting part 520 and the inner wall of the filter element 100 has a specific taper, which abuts against the flexible filter cartridge 400 from loose to tight. The overall fit is tight and easy to disassemble. At the same time, the flexible filter cartridge 400 made of flexible filter screens of different thicknesses can be adapted to the mounting groove 530.

[0033] Specifically, the taper of the outer wall of the filter cartridge connection 520 is between 7° and 10°. After actual production testing, the taper of the mounting groove 530 cannot be too large, otherwise the interference fit will fail, nor can it be too small, otherwise it will be inconvenient to install. The optimal taper of the mounting groove 530 is the range of 7° to 10° formed by the taper of the outer wall of the filter cartridge connection 520.

[0034] The working principle of a Y-type filter fitting in this embodiment is as follows:

[0035] As the fluid medium enters the filter element 100 through the water inlet section 210 of the DC pipe 200 and the water passage 231 on the partition 230, it impacts the flexible filter cartridge 400. The bottom and top surfaces of the abutting protrusion 510 of the fixing member 500 abut against the plane of the partition 230 inside the DC pipe 200 and the end face of the filter element 100, respectively, to form a fixed support. The intermediate connecting part 540 fits against the inner wall of the filter element 100. The flexible filter cartridge 400 with a certain wall thickness is inserted into the mounting groove 530 with an interference fit. The flexible filter cartridge 400 undergoes elastic deformation and forms a radial pressing force with the outer wall of the filter cartridge connecting part 520 and the inner wall of the filter element 100. The radial pressing force generates axial and circumferential frictional forces. The frictional forces counteract the axial and circumferential thrust generated by the fluid pressure, preventing the flexible filter cartridge 400 from undergoing axial displacement and circumferential rotation under the fluid thrust, thus realizing the reliable installation of the non-injection molded filter screen.

[0036] The beneficial effects of this embodiment are: the frictional force generated by the interference fit counteracts the axial and circumferential thrust generated by the fluid pressure, preventing the flexible filter cartridge 400 from displacing under the fluid thrust, effectively preventing the flexible filter cartridge 400 made of commercially available filter screen from detaching from the fixing part 500, thereby avoiding problems such as sealing failure and impurity bypass. It can be well compatible with commercially available filter screens of different sizes and mesh counts, ensuring the reliability of its installation.

[0037] Example 2

[0038] This embodiment is a second embodiment of a Y-type filter fitting, such as... Figures 1 to 6 As shown, the difference from Embodiment 1 is as follows:

[0039] Specifically, the filter element 100 includes an installation head 110 and a filter cartridge installation part 120. The installation head 110 is threadedly connected to the branch pipe 300, and the flexible filter cartridge 400 is installed in the filter cartridge installation part 120. The filter element 100 adopts a threaded connection installation form. The top end of the branch pipe 300 is provided with an internal thread. During installation and disassembly, the installation head 110 can be rotated, which is simple to operate.

[0040] Specifically, the outer wall of the filter cartridge mounting part 120 is provided with a number of limiting ribs 121 and a hollow part 122. The hollow part 122 is formed by the interlacing of the number of limiting ribs 121 in the circumferential and axial directions. By using the form of limiting ribs 121, the filter cartridge mounting part 120 of the filter element 100 can both achieve radial limiting of the flexible filter cartridge 400 and achieve communication between the filter element 100 and the DC pipe 200.

[0041] Specifically, the outer wall of the intermediate connecting part 540 is provided with a number of axial ribs 541 distributed circumferentially, and the limiting ribs 121 are located between two adjacent axial ribs 541; the wall of the filter cartridge mounting part 120 is composed of a number of interlaced limiting ribs 121, and the formation of the hollow part 122 makes it difficult to fix the entire fixing part 500 circumferentially. On the intermediate connecting part 540, the axial ribs 541 are fixed circumferentially by two adjacent axial ribs 541 locking the axially arranged limiting ribs 121.

[0042] Specifically, a step 123 is provided on the inner wall of the filter cartridge mounting part 120 near the mounting head 110, and the step 123 abuts against the flexible filter cartridge 400; the step 123 abuts against the flexible filter cartridge 400 at the end away from the fixing member 500 to prevent the flexible filter cartridge 400 from axially sliding and shifting when the impact force is too large or the interference fit connection fails.

[0043] The working principle of a Y-type filter fitting in this embodiment is as follows:

[0044] During installation, a fixing member 500 is first placed inside the branch pipe 300, so that the fixing member 500 abuts against the partition plate 230. Then, a flexible filter cartridge 400 is placed inside, so that the flexible filter cartridge 400 abuts against the filter cartridge connection part 520. Then, the filter element 100 is screwed into the branch pipe 300, and the mounting head 110 is threadedly connected to the branch pipe 300. The other end of the flexible filter cartridge 400 abuts against the step part 123 of the filter cartridge mounting part 120. The limiting rib 121 of the filter cartridge mounting part 120 is clamped between two axial ribs 541. The medium flows in from the water inlet section 210 of the direct pipe 200, enters the cavity of the filter element 100 through the water passage 231 of the partition plate 230, and after being filtered by the flexible filter cartridge 400, the clean medium flows into the water outlet section 220 through the perforated part 122.

[0045] The beneficial effects of this embodiment are: the interlaced ribs 121 form a hollowed-out portion 122, which can both form the wall surface of the filter cartridge mounting portion 120 to restrict the flexible filter cartridge 400 and realize the connection between the filter element 100 and the water outlet section 220.

[0046] Example 3

[0047] This embodiment is a third embodiment of a Y-type filter fitting, such as... Figure 1 and 3 As shown, the difference from Embodiment 1 is as follows:

[0048] Specifically, it also includes a first sealing ring 600 and a second sealing ring 700. A sealing groove 111 is provided at one end of the filter cartridge mounting part 120 near the mounting head 110. The first sealing ring 600 is installed in the sealing groove 111, and the second sealing ring 700 is installed between the mounting head 110 and the abutting end face of the branch pipe 300. There is a gap between the inner wall of the branch pipe 300 and the outer wall of the filter cartridge mounting part 120. The first sealing ring 600 and the second sealing ring 700 are provided to prevent fluid from leaking from the opening of the branch pipe 300.

[0049] Specifically, it also includes a socket connector 800, which is installed at the openings of the inlet section 210 and the outlet section 220. The socket connector 800 is used to connect the external pipeline to the openings of the inlet section 210 and the outlet section 220 and to provide an effective seal.

[0050] The working principle of a Y-type filter fitting in this embodiment is as follows:

[0051] When installing the filter element 100, first install the first seal in the sealing groove 111, then place the second seal on the end face of the branch pipe 300, and finally screw in the filter element 100; first place the sealing ring on the end face of the outlet section 220 and the inlet section 210, then connect them to the external pipe body, and finally install the socket connector 800 for fixation.

[0052] The beneficial effects of this embodiment are: the setting of the first sealing ring 600 and the second sealing ring 700 improves the sealing performance of the filter pipe and avoids media leakage.

[0053] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A Y-type filter fitting, comprising a Y-type pipe body and a filter element (100), wherein the Y-type pipe body includes a direct current pipe (200) and a branch pipe (300), the direct current pipe (200) and the branch pipe (300) are connected, the filter element (100) is installed inside the branch pipe (300) and divides the direct current pipe (200) into an inlet section (210) and an outlet section (220), the interior of the filter element (100) is connected to both the inlet section (210) and the outlet section (220), and the inner wall of the filter element (100) is provided with a flexible filter cartridge (400), characterized in that, It also includes a fixing component (500), a partition (230) is provided between the direct pipe (200) and the branch pipe (300), the partition (230) is provided with a water passage hole (231) connecting the flexible filter cartridge (400) and the water inlet section (210), the fixing component (500) includes an abutting protrusion ring (510) and a filter cartridge connecting part (520) provided on the abutting protrusion ring (510); the bottom surface of the abutting protrusion ring (510) abuts against the partition (230), the top surface of the abutting protrusion ring (510) abuts against the bottom end face of the filter element (100); the filter cartridge connecting part (520) and the inner wall of the filter element (100) form an installation groove (530), the installation groove (530) and the flexible filter cartridge (400) are interference fit connected.

2. The Y-type filter fitting according to claim 1, characterized in that, The fixing member (500) is annular and includes an intermediate connecting part (540). The two ends of the intermediate connecting part (540) are respectively connected to the abutting protrusion (510) and the filter cartridge connecting part (520). The outer wall of the intermediate connecting part (540) abuts against the inner wall of the filter element (100).

3. A Y-type filter fitting according to claim 2, characterized in that, The outer diameter of the filter cartridge connecting part (520) is smaller than the outer diameter of the intermediate connecting part (540). The filter cartridge connecting part (520) is tapered, and the outer diameter of the top end of the filter cartridge connecting part (520) is smaller than the outer diameter of the bottom end.

4. A Y-type filter fitting according to claim 3, characterized in that, The taper of the outer wall of the filter cartridge connection (520) is between 7° and 10°.

5. A Y-type filter fitting according to any one of claims 2-4, characterized in that, The filter element (100) includes a mounting head (110) and a filter cartridge mounting part (120). The mounting head (110) is threadedly connected to the branch pipe (300), and the flexible filter cartridge (400) is installed in the filter cartridge mounting part (120).

6. A Y-type filter fitting according to claim 5, characterized in that, The outer wall of the filter cartridge mounting part (120) is provided with a plurality of limiting ribs (121) and a hollow part (122), and the hollow part (122) is formed by the plurality of limiting ribs (121) being arranged alternately in the circumferential and axial directions.

7. A Y-type filter fitting according to claim 6, characterized in that, The outer wall of the intermediate connecting part (540) is provided with a plurality of axial ribs (541) distributed circumferentially, and the limiting rib (121) is located between two adjacent axial ribs (541).

8. A Y-type filter fitting according to claim 5, characterized in that, The filter cartridge mounting part (120) has a stepped part (123) on the inner wall of one end near the mounting head (110), and the stepped part (123) abuts against the flexible filter cartridge (400).

9. A Y-type filter fitting according to claim 5, characterized in that, It also includes a first sealing ring (600) and a second sealing ring (700). The mounting head (110) is provided with a sealing groove (111) at one end near the filter cartridge mounting part (120). The first sealing ring (600) is installed in the sealing groove (111), and the second sealing ring (700) is installed between the mounting head (110) and the abutting end face of the branch pipe (300).

10. A Y-type filter fitting according to claim 1, characterized in that, It also includes a socket connector (800), which is installed at the opening of the water inlet section (210) and the water outlet section (220).

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