Floor drain core

Abstract

The invention discloses a floor drain core, belongs to the technical field of floor drains, and solves the problem that an existing floor drain core is relatively low in stability after being used for a long time. According to the floor drain core of the improved structure, an inner magnet is arranged on a guide rod, the floor drain core further comprises at least two outer magnets distributed in the circumferential direction of the inner magnet, a plurality of first guide grooves extending in the radial direction of the guide rod are formed in a supporting part, and the floor drain core further comprises an annular adjusting piece rotationally connected with the supporting part; the guide rod is sleeved with the adjusting piece, second arc-shaped guide grooves corresponding to the first guide grooves one to one are formed in the adjusting piece, the second guide grooves are diverged from the center of the adjusting piece to the periphery of the adjusting piece, the vertical projection of the second guide grooves and the corresponding first guide grooves are arranged in a crossed mode, and the outer magnets are directly or indirectly embedded into the first guide grooves and the second guide grooves. When the adjusting piece is rotated in the circumferential direction, all the outer magnets can be synchronously driven to slide along the first guide grooves at equal intervals, and the magnetic force between the outer magnets can be adjusted. The floor drain core with the improved structure can ensure the stability of long-term use.

Description

Technical Field

[0001] This invention belongs to the field of floor drain technology and relates to a floor drain core. Background Technology

[0002] Floor drains are a key component of modern building drainage systems, with their core functions being drainage and odor prevention. Magnetic sealing floor drains are widely used due to their rapid response and excellent sealing effect. These drains typically utilize the magnetic attraction between magnetic components to seal the outlet when there is no drainage, preventing odor backflow.

[0003] For example, Chinese patent literature discloses an under-sink air purifier (application publication number: CN106759809A). This magnetic levitation drain core includes a cylindrical body, a cylindrical inner shell connected to the cylindrical body, and a sealing element. The lower end of the cylindrical body is connected to a bracket. The sealing element includes a rod and a sealing part. The rod passes through the bracket. A reset mechanism is provided between the sealing element and the bracket. The sealing element can abut against the lower end of the inner shell and seal under the action of the reset mechanism. This magnetic levitation drain core has the characteristics of good reliability in use.

[0004] However, the magnetic sealing force of this type of magnetic floor drain relies entirely on the inherent magnetic strength of the magnet during long-term use. In actual use, the drain core is constantly exposed to complex media such as hot water, detergents, and sewage, and may be subjected to high temperatures and humidity. These factors can irreversibly cause problems such as magnetic attenuation and surface corrosion of the magnet. The weakening of the magnetic force directly leads to incomplete repositioning of the sealing element, reduced sealing effect, or even failure to close properly, rendering the odor-proof function of some floor drains ineffective. Therefore, the long-term stability and reliability of existing magnetic floor drain products cannot be guaranteed.

[0005] To address the issue of magnetic force attenuation, conventional technical approaches in this field primarily focus on improving the durability of the magnet itself. This includes methods such as coating the magnet surface to isolate it from corrosive media, or using rare-earth magnets like neodymium iron boron (NdFeB) which offer stronger magnetic force and higher stability. However, these methods are all "passive defense" measures, offering limited improvement and increasing manufacturing costs. Most importantly, they cannot compensate for or repair magnetic force attenuation that has already occurred during use. Once the magnetic force weakens below a critical point, the entire drain core fails, forcing users to replace the entire core (most drains on the market now feature a replaceable core design), which undoubtedly increases usage costs and wastes resources. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a drain core. The technical problem this invention aims to solve is how to ensure long-term stability and reliability.

[0007] The objective of this invention can be achieved through the following technical solution: A drain core includes a shell and a sealing element that can move up and down. The shell includes a cylindrical main body with a water outlet and a support portion located below the main body. The sealing element includes a guide rod passing through the support portion. An inner magnet is provided on the guide rod. The drain core also includes at least two outer magnets distributed circumferentially along the inner magnet. The sealing element abuts against the water outlet under the magnetic force of the outer magnets and the inner magnet. The support portion is provided with a plurality of guide grooves extending radially along the guide rod. The drain core also includes an annular adjusting element rotatably connected to the support portion. The adjusting element is sleeved outside the guide rod and is provided with arc-shaped guide grooves corresponding to the guide grooves. The guide grooves radiate from the center of the adjusting element to the outer periphery of the adjusting element and intersect with the corresponding guide grooves in the vertical projection. The outer magnets are directly or indirectly embedded in the guide grooves and guide grooves. When the adjusting element is rotated circumferentially, it can synchronously drive all the outer magnets to slide equidistantly along the guide grooves.

[0008] This invention adds an annular adjusting component that can rotate circumferentially relative to the support. This adjusting component has an arc-shaped guide groove II, into which the outer magnet extends directly or indirectly. Since guide groove I and its corresponding guide hole or guide groove II are intersected, and the outer magnet is directly or indirectly embedded in guide groove I, the intersection of guide groove I and guide groove II or guide hole positions the outer magnet. When the user rotates the adjusting component, the wall of guide groove II pushes the outer magnet, and in conjunction with the wall of guide groove I, decomposes a radial force, forcing the outer magnet to slide along guide groove I. Since the relative position of the housing containing guide groove I is fixed, the distance to the inner magnet can be changed smoothly and linearly. That is, all outer magnets can move closer to or further away from the guide rod (i.e., the inner magnet) along the extension direction of guide groove I, sliding synchronously and equidistantly. Therefore, the relative distance between the outer and inner magnets is changed, allowing for adjustable magnetic force between them. When long-term use causes magnetic force to weaken, users simply need to remove the drain core from the drain and gently rotate the adjusting component to bring the outer magnet slightly closer to the inner magnet. This restores or even enhances the initial sealing magnetic force, fundamentally solving the problem of irreparable magnetic force. Furthermore, because the magnetic force is adjustable, users can adapt the drain core's magnetic force during installation to meet different opening force requirements. This avoids situations where the factory-set opening force is insufficient due to low wastewater volume or internal pipe pressure, or where high sealing requirements necessitate a strong magnetic reset force, resulting in an unsatisfactory sealing effect. This allows for more precise adaptation to different needs, ensuring stability and reliability over long-term use.

[0009] In the aforementioned drain core, the support part has a bowl-shaped, downward-facing hydrophobic cover and a cylindrical guide tube protruding downward from the center of the bottom of the hydrophobic cover. The support part forms a guide groove between the guide tube and the hydrophobic cover.

[0010] The hydrophobic cover acts as a protective shield, guiding sewage to drain quickly and isolating it from the external magnet to some extent. This prevents magnetic contaminants from adhering to the surface of the external magnet and also isolates it from corrosion by complex media such as hot water, detergents, and sewage, ensuring the stability and reliability of the external magnet during long-term use. In the aforementioned drain core, the adjusting component is located inside the hydrophobic cover and has a toggle block protruding from the lower surface of the hydrophobic cover.

[0011] The adjusting element is also located inside the drain cover, which provides some protection for it, preventing dirt from adhering to the element and affecting its rotation. This ensures smooth operation and the stability and reliability of the subsequent drain core. The protruding toggle block on the lower surface of the drain cover provides a clear point of force application, facilitating manual adjustment.

[0012] In the aforementioned drain core, the adjusting component is disc-shaped and includes a plate-shaped base plate and a cylindrical protrusion protruding downward from the outer edge of the base plate. The base plate is provided with the second guide groove, which is spirally diverging. The protrusion is located inside the lower end of the drain cover, and there is a rotation gap between the outer wall of the protrusion and the inner wall of the drain cover.

[0013] The base plate provides a certain degree of obstruction, and the protrusion and the hydrophobic cover have a slight rotational gap. This gap should not be too large; a slight gap is sufficient. This structure ensures smooth rotation of the adjusting component while effectively preventing sewage or dirt from entering the long, straight guide groove, thus avoiding the outer magnet from getting stuck due to dirt accumulation. This prevents issues with smooth operation and ensures the stability and reliability of the subsequent drain core. The spirally diverging guide groove allows for linear changes in magnetic force adjustment with less rotational resistance, resulting in smoother rotation.

[0014] In the aforementioned drain core, the adjusting component is sleeved outside the guide cylinder, and a limiting nut is also provided on the inner side of the adjusting component. The limiting nut is threadedly connected to the lower end of the guide cylinder and abuts against the lower surface of the substrate.

[0015] The limiting nut can be used to support the adjusting component and prevent it from falling off. Of course, the limiting nut should not be tightened too much, which would cause the base plate to stick to the hydrophobic cover. An appropriate gap should be left to provide the necessary rotation clearance for the adjusting component. At the same time, the threaded adjustment can facilitate disassembly and installation. After long-term use, the limiting nut can be unscrewed to clean the dirt that has accumulated on the external magnet over the years, so as to further improve the stability and reliability of the subsequent drain core.

[0016] In the aforementioned drain core, the outer magnet is fixedly connected to a positioning seat, and the outer magnet is indirectly embedded in guide groove one and guide groove two through the positioning seat. The positioning seat completely covers the outer magnet, and a downward protruding post is formed on the positioning seat. The outer magnet is located above the substrate, the protruding post is embedded in guide groove two, and the upper part of the positioning seat is embedded in guide groove one.

[0017] The positioning base can change the position of the outer magnet when the adjusting component is rotated, thereby achieving precise adjustment of the magnetic force and ensuring the stability and reliability of the drain core during long-term use. Furthermore, the positioning base completely encloses the outer magnet, isolating it from sewage and preventing dirt from adhering to the magnet and affecting its magnetism, thus further ensuring the stability and reliability of the drain core. This positioning base can be made of plastic, featuring a simple structure and easy injection molding, providing effective protection without significantly increasing manufacturing costs.

[0018] In the aforementioned drain core, the adjusting component is located inside the drainage cover. The adjusting component is in the shape of a stepped column and includes a large diameter section at the top and a small diameter section at the bottom. The large diameter section has a second guide groove on its upper surface, and the second guide groove is spirally diverging. The external magnet is embedded in both the second guide groove and the first guide groove. The bottom surface of the small diameter section has an operating hole with a non-circular cross-section.

[0019] The larger diameter section provides ample adjustment stroke, while the non-circular operating hole on the smaller diameter section allows for easy tool insertion and screwing, thus rotating the entire adjustment component and changing the size of the external magnet to ensure the stability and reliability of the subsequent drain core. An internal hexagonal or flathead hole can be used here to apply torque with a standard tool (such as an Allen wrench), achieving more precise and effortless adjustment. The operating hole can be either blind or through. The spirally diverging guide groove allows for linear magnetic force adjustment with less rotational resistance, resulting in smoother rotation.

[0020] In the aforementioned drain core, a disc-shaped limiting member is provided below the large-diameter section and abuts against the lower surface of the large-diameter section. The limiting member has a limiting plate, a connecting cylinder protruding downward from the outer edge of the limiting plate, and an inner cylinder protruding downward from the inner edge of the limiting plate. The connecting cylinder is located inside the drainage cover and is threadedly connected to the drainage cover. The inner cylinder is sleeved outside the small-diameter section and has a rotational gap of two with the small-diameter section.

[0021] The limiting component, connected to the hydrophobic cover via a threaded connection, reliably isolates and secures the entire upper mechanism. Its limiting plate effectively blocks contaminants, preventing sewage or dirt from easily entering and contacting the external magnet above it, while also preventing interference with the sliding adjustment of the external magnet, thus ensuring structural stability. The existence of a second rotational clearance between the inner cylinder and the small-diameter section (which should not be excessive) ensures smooth rotation of the adjusting component while also providing anti-fouling and auxiliary centering guidance, collectively enhancing long-term operational reliability.

[0022] In the aforementioned drain core, the inner wall of the drainage cover has several guide plate groups that protrude downwards and correspond one-to-one with the outer magnets. The guide plate group includes a narrow plate in the middle and two wide plates located on both sides of the narrow plate and arranged parallel to the narrow plate. The bottom surface of the narrow plate is higher than the bottom surface of the two wide plates. The narrow plate, the two wide plates, the drainage cover, and the guide cylinder form the aforementioned guide groove.

[0023] The structured design of the guide plate assembly to form the guide groove not only achieves its function but also makes the hydrophobic cover more stable, enhancing its support and protection for the internal magnetic and adjusting components. This integrated design ensures functional reliability while also optimizing the product's structural strength and manufacturability.

[0024] In the aforementioned drain core, the inner magnet is a vertically elongated strip, and the magnetic poles of the outer magnet are radially distributed along the guide rod, with the inner magnetic poles of the outer magnet being different from the lower magnetic poles of the inner magnet.

[0025] This invention abandons the traditional layout of vertically opposed magnets (i.e., both magnets have their poles vertically distributed), and instead employs a combination of a "vertical inner magnet" and a "radial outer magnet" in conjunction with a "circumferentially rotatable adjusting component." This unique layout brings a key technical effect: even if the position of the outer magnet is changed, the effective working stroke of the seal remains constant and is unaffected by magnetic force adjustment. The principle is that the point of magnetic force application of the outer magnet to the inner magnet is always limited within the length range of the inner magnet in the vertical direction. Regardless of how the outer magnet moves radially to adjust the magnetic force, the highest sealing position (i.e., the position where it contacts the outlet) that the seal can rise to under magnetic force, and the lowest opening position that it can descend to under the impact of water flow, are both fixed physical strokes determined by the length of the inner magnet. Adjusting the magnetic force only changes the force required to reach the sealing position, without changing the position itself. In contrast, if a traditional top-and-bottom magnet layout is used, adjusting the vertical distance between the two magnets to change the magnetic force will inevitably change the balance position of the seal, resulting in inconsistent reset heights, which may cause new problems such as poor sealing or difficulty in opening.

[0026] Compared with existing technologies, the advantages of local leakage cores are:

[0027] A circumferentially rotating ring adjustment component has been added. When the magnetic force weakens due to long-term use, the user only needs to remove the drain core from the drain and simply rotate the adjustment component to bring the outer magnet slightly closer to the inner magnet, which can restore or even enhance the initial sealing magnetic force, fundamentally solving the problem of irreparable magnetic force.

[0028] Furthermore, through the synergistic effect of the two major features of "magnetic adjustment" and "magnetic pole layout", not only is the magnetic force adjustable and compensable, but the stability of the system's working state after adjustment is also ensured, thereby fundamentally improving the long-term stability and reliability of the drain core and its adaptability to complex application scenarios. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the drain core in Example 1.

[0030] Figure 2 This is a three-dimensional structural diagram of the drain core from another perspective in Embodiment 1.

[0031] Figure 3 This is a cross-sectional view of the drain core in Example 1.

[0032] Figure 4 yes Figure 3 Sectional view along direction A.

[0033] Figure 5 This is a three-dimensional structural diagram of the shell in Embodiment 1.

[0034] Figure 6 This is a three-dimensional structural diagram of the housing after the external magnet is installed in Embodiment 1.

[0035] Figure 7 This is a three-dimensional structural diagram of the adjusting component in Embodiment 1.

[0036] Figure 8 This is a three-dimensional structural diagram of the drain core installed in the drain body in Embodiment 1.

[0037] Figure 9 This is a three-dimensional structural diagram of the drain core in Example 2.

[0038] Figure 10 This is a cross-sectional view of the drain core in Example 2.

[0039] Figure 11 yes Figure 10 Sectional view along direction B.

[0040] Figure 12 This is a three-dimensional structural diagram of the adjusting component in Embodiment 2.

[0041] In the diagram, 1. Drain core; 10. Shell; 11. Main body; 12. Support; 121. Drain cover; 122. Guide cylinder; 123. Guide groove one; 124. Guide plate assembly; 1241. Narrow plate; 1242. Wide plate; 2. Sealing element; 21. Guide rod; 3. Inner magnet; 4. Outer magnet; 5. Adjusting element; 52. Guide groove two; 53. Actuating block; 54. Base plate; 55. Protrusion; 56. Large diameter section; 57. Small diameter section; 571. Operating hole; 58. Auxiliary groove; 61. Rotation clearance one; 62. Rotation clearance two; 63. Positioning seat; 631. Protruding column; 7. Drain body; 8. Limiting nut; 9. Limiting element; 91. Limiting plate; 92. Connecting cylinder; 93. Inner cylinder. Detailed Implementation

[0042] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0043] Example 1

[0044] A drain core 1, as shown in the figure Figure 1-3 The device includes a housing 10 and a vertically movable sealing element 2. The housing 10 includes a cylindrical body 11 with an outlet and a support portion 12 located below the body 11. The sealing element 2 includes a guide rod 21 passing through the support portion 12, and an inner magnet 3 is provided on the guide rod 21. The inner magnet 3 is a vertically elongated strip. Figure 3 , 4 As shown, the support portion 12 is provided with three outer magnets 4 distributed circumferentially along the inner magnet 3. Each outer magnet 4 is fixedly connected to a positioning seat 63. In this embodiment, the positioning seat 63 encloses the outer magnet 4 to form a fixed connection between the two. In addition, the positioning seat 63 has a downwardly protruding post 631. In this solution, the positioning seat 63 is made of plastic material, has a simple structure, and is easy to injection mold.

[0045] like Figure 3 , 5 As shown in Figure 6, the support portion 12 has a bowl-shaped hydrophobic cover 121 with its opening facing downwards and a cylindrical guide tube 122 protruding downwards from the center of the bottom of the hydrophobic cover 121. Furthermore, the inner wall of the hydrophobic cover 121 has several guide plate assemblies 124 protruding downwards. The guide plate assembly 124 includes a narrow plate 1241 located in the middle and two wide plates 1242 located on both sides of the narrow plate 1241 and arranged parallel to the narrow plate 1241. The bottom surface of the narrow plate 1241 is higher than the bottom surface of the two wide plates 1242. A long straight guide groove 123 extending radially along the guide tube 122 is formed between the narrow plate 1241, the two wide plates 1242, the hydrophobic cover 121, and the guide tube 122. That is, the guide groove 123 is formed between the guide tube 122 and the hydrophobic cover 121. The external magnet 4 is indirectly embedded in the guide groove 123 through the positioning seat 63.

[0046] In this embodiment, the magnetic poles of the outer magnet 4 are radially distributed along the guide rod 21, and the inner magnetic poles of the outer magnet 4 are different from the lower magnetic poles of the inner magnet 3. The sealing member 2 abuts against the water outlet under the magnetic force of the outer magnet 4 and the inner magnet 3.

[0047] like Figure 3 , 7 As shown, the local leakage core 1 also includes an annular adjusting member 5. The adjusting member 5 is disposed inside the hydrophobic cover 121. The adjusting member 5 is disc-shaped and includes a plate-shaped base plate 54 and a cylindrical protrusion 55 protruding downward from the outer edge of the base plate 54. A second guide groove 52 is provided on the base plate 54. The second guide groove 52 is spirally diverging around the guide rod 21 and intersects with the corresponding first guide groove 123 in the vertical projection. The protrusion 55 is located inside the lower end of the hydrophobic cover 121, and there is a rotation gap 61 between the outer wall of the protrusion 55 and the inner wall of the hydrophobic cover 121. Specifically, the adjusting member 5 is sleeved on the outside of the guide rod 21 and can rotate circumferentially relative to the support part 12. In this embodiment, the outer magnet 41 is located above the base plate 54, and the protrusion 421 extends into the second guide groove 52. In this embodiment, the guide groove 52 is a through groove that runs vertically through the base plate. In this solution, the outer magnet 4 is indirectly embedded in the first guide groove 123 and the second guide groove 52 through the positioning seat 63. When the circumferential adjusting component 5 is rotated, the outer magnet 4 slides along the second guide groove 52. Since the second guide groove 52 is arc-shaped, while the first guide groove 123 is long and straight, when the user rotates the adjusting component 5, the long straight guide groove 123 provides precise radial guidance for the outer magnet 4, ensuring that it can only move radially during adjustment. The arc-shaped guide groove 52 can decompose a radial force during the rotation of the adjusting component 5; that is, the wall of the second guide groove 52 pushes the outer magnet 4, forcing it to smoothly and linearly change its distance from the inner magnet 3 along the extension direction of the long straight guide groove 123, thus achieving precise adjustment of the magnetic force.

[0048] In this design, the adjusting component 5 has a toggle block 53 protruding from the lower surface of the hydrophobic cover 121. The toggle block 53 provides the user with a clear point of force application, facilitating manual adjustment. Figure 2 , 3 As shown, the adjusting member 5 is sleeved outside the guide cylinder 122, and a limiting nut 8 is also provided inside the adjusting member 5. The limiting nut 8 is threadedly connected to the lower end of the guide cylinder 122 and abuts against the lower surface of the base plate 54. The limiting nut 8 can be used to support the adjusting member 5 and prevent it from falling.

[0049] In this embodiment, the drain core 1 is used as follows: Figure 8As shown, the drain core 1 is installed in the drain body 7, and the drain body 7 and the drain core 1 are detachably connected. In this design, the two are connected by screwing and snapping. When the magnetic force weakens due to long-term use, the user only needs to remove the drain core 1 from the drain body 7 and simply rotate the adjusting component 5 to move the outer magnet 4 slightly closer to the inner magnet 3, which can restore or even enhance the initial sealing magnetic force, fundamentally solving the problem of non-compensable magnetic force. Specifically, when the user rotates the adjusting component 5, the outer magnet 4 can move closer to or further away from the guide rod 21 (i.e., the inner magnet 3) along the extension direction of the guide groove 2 52, thus changing the relative distance between the outer magnet 4 and the inner magnet 3, and realizing the adjustable magnetic force between them.

[0050] This embodiment achieves quick adjustment without tools and by hand through the toggle block 53 of the disc-shaped adjustment component 5, which improves the user experience and adjustment convenience.

[0051] Example 2

[0052] This embodiment is basically the same as embodiment one in structure and principle, except that: Figure 10-12 As shown, the adjusting member 5 is in the shape of a stepped column and includes a large diameter section 56 at the top and a small diameter section 57 at the bottom. A guide groove 52 is provided on the upper surface of the large diameter section 56, and an operating hole 571 with a hexagonal cross-section is provided on the bottom surface of the small diameter section 57, which facilitates the application of torque by a standard tool (such as an Allen wrench) to achieve more precise and labor-saving adjustment.

[0053] like Figure 9 , 10 As shown, a disc-shaped limiting member 9 is provided below the large-diameter section 56 and abuts against the lower surface of the large-diameter section 56. The limiting member 9 has a limiting plate 91, a connecting cylinder 92 protruding downward from the outer edge of the limiting plate 91, and an inner cylinder 93 protruding downward from the inner edge of the limiting plate 91. The connecting cylinder 92 is located inside the hydrophobic cover 121 and is threadedly connected to the hydrophobic cover 121. The inner cylinder 93 is sleeved on the outside of the small-diameter section 57 and has a rotational clearance 62 between it and the small-diameter section 57. Of course, this rotational clearance 62 should not be too large. In this design, the limiting plate 91 can effectively block dirt and prevent sewage or dirt from easily entering and contacting the outer magnet 4 above it.

[0054] In addition, in this scheme, the outer magnet 4 is directly embedded in the guide groove 123 and the guide groove 22. In order to facilitate the installation of the outer magnet 4 and the opening of the guide groove 22, an auxiliary groove 58 connected to the guide groove 22 is also provided at one end of the guide groove 22.

[0055] Example 3

[0056] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that: in this solution, no additional limiting nut 8 is added. The adjusting component 5 is directly connected to the guide cylinder 122 through a snap-fit ​​structure, thereby ensuring that the axis of the adjusting component 5 will not fall off, and also enabling relative rotation of the two in the circumferential direction.

[0057] Example 4

[0058] This embodiment is basically the same as the first embodiment in terms of structure and principle. The difference is that there is no separate actuating block 53 on the lower surface of the adjusting member 5. By setting a knurled structure on the lower part of the adjusting member 5, the contact friction can also be increased, providing the user with a clear point of force application, which is convenient for manual operation and adjustment.

[0059] Example 5

[0060] The structure and principle of this embodiment are basically the same as those of the first embodiment. The difference is that the second guide groove 52 is not spiral divergent. The second guide groove 52 is a straight groove and is set at an acute angle to the first guide groove 123 in the vertical projection.

[0061] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A drain core, comprising a housing (10) and a seal (2) movable up and down, wherein the housing (10) comprises a cylindrical body (11) having an outlet and a support portion (12) located below the body (11), the seal (2) comprises a guide rod (21) passing through the support portion (12), an inner magnet (3) being disposed on the guide rod (21), the drain core (1) further comprising at least two outer magnets (4) distributed circumferentially along the inner magnets (3), the seal (2) abutting against the outlet under the magnetic force of the outer magnets (4) and the inner magnets (3), characterized in that, The support part (12) is provided with a plurality of guide grooves (123) extending radially along the guide rod (21). The drain core (1) also includes an annular adjusting member (5) rotatably connected to the support part (12). The adjusting member (5) is sleeved on the guide rod (21) and is provided with an arc-shaped guide groove (52) corresponding to the guide grooves (123). The guide grooves (52) radiate from the center of the adjusting member (5) to the outer periphery of the adjusting member (5) and intersect with the corresponding guide grooves (123) in the vertical projection. The external magnets (4) are directly or indirectly embedded in the guide grooves (123) and the guide grooves (52). When the adjusting member (5) is rotated circumferentially, it can synchronously drive all the external magnets (4) to slide equidistantly along the guide grooves (123).

2. The drain core according to claim 1, characterized in that, The support (12) has a bowl-shaped hydrophobic cover (121) with the opening facing downward and a cylindrical guide tube (122) protruding downward from the center of the bottom of the hydrophobic cover (121). The support (12) forms a guide groove (123) between the guide tube (122) and the hydrophobic cover (121).

3. The drain core according to claim 2, characterized in that, The adjusting member (5) is located inside the hydrophobic cover (121) and has a toggle block (53) protruding from the lower surface of the hydrophobic cover (121).

4. The drain core according to claim 2 or 3, characterized in that, The adjusting member (5) is disc-shaped and includes a plate-shaped base plate (54) and a cylindrical protrusion (55) protruding downward from the outer edge of the base plate (54). The base plate (54) is provided with the second guide groove (52) and the second guide groove (52) is spirally diverging. The protrusion (55) is located inside the lower end of the hydrophobic cover (121) and there is a rotation gap (61) between the outer wall of the protrusion (55) and the inner wall of the hydrophobic cover (121).

5. The drain core according to claim 4, characterized in that, The adjusting member (5) is sleeved outside the guide cylinder (122), and a limiting nut (8) is also provided inside the adjusting member (5). The limiting nut (8) is threaded to the lower end of the guide cylinder (122) and abuts against the lower surface of the substrate (54).

6. The drain core according to claim 4, characterized in that, The outer magnet (41) is fixedly connected to the positioning seat (41) and the outer magnet (41) is indirectly embedded in the first guide groove (123) and the second guide groove (52) through the positioning seat (41). The positioning seat (63) completely covers the outer magnet (41) and a downward protruding post (631) is formed on the positioning seat (63). The outer magnet (41) is located above the substrate (54). The protruding post (631) is embedded in the second guide groove (52). The upper part of the positioning seat (41) is embedded in the first guide groove (123).

7. The drain core according to claim 2, characterized in that, The adjusting component (5) is located inside the hydrophobic cover (121). The adjusting component (5) is in the shape of a stepped column and includes a large diameter section (56) located above and a small diameter section (57) located below. The large diameter section (56) has a guide groove two (52) on its upper surface and the guide groove two (52) is spirally diverging. The external magnet (4) is embedded in both the guide groove two (52) and the guide groove one (123). The bottom surface of the small diameter section (57) has an operating hole (571) with a non-circular cross-section.

8. The drain core according to claim 7, characterized in that, Below the large diameter section (56), there is a disc-shaped limiting member (9) that abuts against the lower surface of the large diameter section (56). The limiting member (9) has a limiting plate (91), a connecting cylinder (92) protruding downward from the outer edge of the limiting plate (91), and an inner cylinder (93) protruding downward from the inner edge of the limiting plate (91). The connecting cylinder (92) is located inside the hydrophobic cover (121) and is threadedly connected to the hydrophobic cover (121). The inner cylinder (93) is sleeved outside the small diameter section (57) and has a rotational gap (62) between it and the small diameter section (57).

9. The drain core according to claim 2, characterized in that, The inner wall of the hydrophobic cover (121) has a guide plate assembly (124) that protrudes downward and corresponds one-to-one with the outer magnet (4). The guide plate assembly (124) includes a narrow plate (1241) in the middle and two wide plates (1242) located on both sides of the narrow plate (1241) and arranged parallel to the narrow plate (1241). The bottom surface of the narrow plate (1241) is higher than the bottom surface of the two wide plates (1242). The narrow plate (1241), the two wide plates (1242), the hydrophobic cover (121) and the guide cylinder (122) form the aforementioned guide groove (123).

10. The drain core according to claim 1, characterized in that, The inner magnet (3) is a vertical strip, and the magnetic poles of the outer magnet (4) are radially distributed along the guide rod (21), and the inner magnetic poles of the outer magnet (4) are different from the lower magnetic poles of the inner magnet (3).

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