A telescopic adjustable magnetic force self-sealing floor drain core

Abstract

The present application relates to floor drain core technical field, especially in a kind of telescopic adjustment magnetic force self-closing floor drain core, it includes the body and adjusting cylinder of each other, at least one first limiting portion is provided on the body, adjusting cylinder is provided with the array slot of being arranged along the axial direction of adjusting cylinder and one end opening in the position corresponding first limiting portion, first limiting portion and array slot form clamping cooperation;Therefore, mechanical first limiting portion and the array slot of being arranged along the axial direction of adjusting cylinder and one end opening are used to height limit, completely abandon the traditional scheme of relying on friction, fundamentally solve the height failure problem caused by aging and pollution of sealing ring, ensure that floor drain core can be stable and reliable under any working condition, perfectly adapt to various complex installation environments, avoid floor drain core to slide down, possibly make floor drain core outlet directly abut on the hard pipeline below, hinder the normal opening and closing of its internal drainage mechanism, cause drainage difficulty even complete blockage.

Description

Technical Field

[0001] This invention relates to the field of drain core technology, and in particular to a retractable and adjustable magnetic self-sealing drain core. Background Technology

[0002] In different renovation scenarios, the thickness of decorative layers such as tiles and cement mortar typically varies between 1-10cm. However, the location of the drain pipes pre-installed by the developer is fixed and cannot be adjusted, leading to the common technical problem of "drain gaps." A "gap" refers to a height difference or gap between the drain core and the drain pipe. This gap structure can cause serious water inlet and drainage problems. On the one hand, the fault will cause some of the water that should have been drained through the drain pipe to seep into the cement mortar layer below, and then spread upward through capillary action. Over time, this accumulation will cause door frames and wooden floors to become damp, moldy, or even rot.

[0003] On the other hand, the presence of faults can affect drainage efficiency, leading to poor drainage and even requiring secondary drainage to remove water seepage from the tile gaps, which increases the complexity and maintenance cost of the drainage system.

[0004] To address this issue, some height-adjustable floor drain products have emerged in the prior art. For example, Chinese patent CN119913975A discloses a telescopic adjustable straight-drain odor-proof floor drain core, which changes its overall length by sliding the upper core on the telescopic core to adapt to different installation height requirements.

[0005] However, such solutions generally suffer from a fatal flaw: they rely on the friction generated by the sealing ring to achieve height limiting. During long-term use, the sealing ring's coefficient of friction decreases significantly due to aging, wear, and the adhesion of microbial biofilms. Once subjected to significant water pressure or external vibration, the friction between the upper and telescopic cores is insufficient to maintain their relative position, easily leading to height limiting failure. This causes the drain core to slide down, potentially causing the drain outlet to directly contact the rigid pipe below, obstructing the normal opening and closing of its internal drainage mechanism, resulting in drainage difficulties or even complete blockage, while also increasing the risk of water ingress into the fault area.

[0006] It should be noted that the information disclosed in this background section is intended only to enhance the understanding of the overall background of the present invention, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] To solve the technical problems existing in the prior art, the present invention provides a retractable and adjustable magnetic self-sealing drain core. The drain core is provided with an inlet and an outlet along the axial direction and includes a body and an adjusting cylinder that are nested together. The body is provided with at least one first limiting part. The adjusting cylinder is provided with an array of grooves arranged along the axial direction of the adjusting cylinder and open at one end, corresponding to the position of the first limiting part. The first limiting part and the array groove form a snap-fit ​​engagement. Rotating the adjusting cylinder at a preset angle causes the first limiting part to disengage from or engage with the array slot, thereby unlocking or locking. In the unlocked state, the adjusting cylinder is moved along the telescopic direction to adjust the height to accommodate the height difference between the drain core and the drain pipe.

[0008] Based on the above, the present invention provides a retractable and adjustable magnetic self-sealing floor drain core. Compared with the prior art, it adopts a mechanical first limiting part and an array of grooves arranged along the axial direction of the adjusting cylinder with one end open for height limiting. By rotating the adjusting cylinder within a small range at a preset angle, the first limiting part can be disengaged or engaged with the array groove. This completely abandons the traditional solution that relies on friction and fundamentally solves the problem of height failure caused by aging and contamination of the sealing ring. It ensures that the floor drain core is stable and reliable under any working condition, perfectly adapts to various complex installation environments, and prevents the floor drain core from sliding down, which may cause the outlet of the floor drain core to directly abut against the rigid pipe below, hindering the normal opening and closing of its internal drainage mechanism, causing drainage difficulties or even complete blockage. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Unless otherwise specified, the positional relationships in the drawings described below are based on the direction in which the components are drawn in the figures.

[0010] Figure 1 This is a schematic diagram of the structure of the retractable and adjustable magnetic self-sealing drain core provided in the first embodiment of the present invention; Figure 2 An exploded structural diagram of the retractable and adjustable magnetic self-sealing drain core provided in the first embodiment of the present invention; Figure 3 This is an exploded structural diagram of the retractable and adjustable magnetic self-sealing drain core provided in the first embodiment of the present invention from another perspective. Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure at point AA; Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure at point BB; Figure 6 for Figure 4 A magnified schematic diagram of the local structure at point N; Figure 7 This is a schematic diagram of the water seal structure provided in the first embodiment of the present invention; Figure 8 for Figure 7 A magnified schematic diagram of the local structure at point M; Figure 9 This is a schematic diagram of the structure of the retractable and adjustable magnetic self-sealing drain core provided in the second embodiment of the present invention; Figure 10 This is a structural schematic diagram of the retractable and adjustable magnetic self-sealing drain core provided in the second embodiment of the present invention from another perspective. Figure 11 This is an exploded structural diagram of the retractable and adjustable magnetic self-sealing drain core provided in the second embodiment of the present invention.

[0011] Figure label: 10-Body, 11-First limiting part, 20-Adjusting cylinder, 20A-First area, 20B-Second area, 20C-Third area, 20D-Fourth area, 21-Second limiting part, 30-Array groove, 31-First array groove, 32-Second array groove, 40-Anti-detachment part, 50-Water seal assembly, 51-Sealing part, 52-Bottom cover, 53-First magnet, 54-Second magnet, 60-Sealing element, R-Water inlet, P-Drain outlet. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof mean "at least comprising."

[0014] To address the technical problems existing in the prior art, or to achieve at least one or more of the aforementioned advantages, an embodiment of the present invention provides a retractable and adjustable magnetic self-sealing floor drain core. As shown in the figure, the floor drain core has an inlet and an outlet arranged axially, and includes a body and an adjusting cylinder nested together. The body has at least one first limiting part, and the adjusting cylinder has an array of grooves arranged axially along the adjusting cylinder and open at one end, corresponding to the position of the first limiting part. The first limiting part and the array grooves form a snap-fit ​​engagement. Rotating the adjusting cylinder at a preset angle causes the first limiting part to disengage from or engage with the array slot, thereby unlocking or locking. In the unlocked state, the adjusting cylinder is moved along the telescopic direction to adjust the height to accommodate the height difference between the drain core and the drain pipe.

[0015] Furthermore, it also includes an anti-detachment part, which is located at one end of the array slot opening.

[0016] Furthermore, the outer periphery of the adjusting cylinder is sequentially divided into a first region, a second region, a third region, and a fourth region. The array groove includes a first array groove located in the first region and a second array groove located in the third region and disposed opposite to the first array groove. The opening direction of the first array groove is opposite to the opening direction of the second array groove. The adjusting cylinder is rotated at a preset angle so that the first limiting part engages with the first array slot and the second array slot respectively, forming opposing common limiting.

[0017] Furthermore, the first region and the third region are recessed regions.

[0018] Furthermore, it also includes a water seal assembly, which includes a sealing part, and a second limiting part is provided on the inner circumference of the adjusting cylinder. The sealing part is engaged with the second limiting part to restrict the axial movement of the sealing part.

[0019] Furthermore, the sealing part is annular.

[0020] Furthermore, the water seal assembly also includes a bottom cover, a first magnet disposed on the bottom cover, and a second magnet disposed on the regulating cylinder corresponding to the first magnet. The bottom cover is embedded in the regulating cylinder and located on the side of the sealing part near the drain outlet. Through the magnetic repulsion force generated by the first magnet and the second magnet, the bottom cover is suspended and presses the sealing part when there is low / no water pressure, forming an initial sealing state. When the water pressure in the regulating cylinder is greater than the magnetic repulsion between the first magnet and the second magnet, the bottom cover is pushed to overcome the magnetic repulsion and move axially toward the drain outlet to expose the drain outlet and allow water to drain out; when the water pressure drops to less than the magnetic repulsion between the first magnet and the second magnet, the bottom cover is reset under the push of the magnetic repulsion and presses the sealing part.

[0021] Furthermore, the drain outlet is disposed on the side wall of the regulating cylinder and extends axially along the regulating cylinder; the axial movement stroke of the bottom cover is configured as follows: In the initial position, the bottom cover is located outside the axial range of the drain outlet; When the bottom cover is pushed axially by water pressure to move into the axial range of the drain outlet, the drain outlet is partially or completely exposed.

[0022] Furthermore, the magnetic poles of the first magnet and the second magnet are parallel to the axial direction of the adjusting cylinder, and the first magnet and the second magnet are arranged with the same pole facing each other or opposite poles attracting each other.

[0023] Furthermore, it also includes a plurality of sealing elements, which are respectively disposed on the body, the adjusting cylinder and the bottom cover.

[0024] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application and through various specific implementation methods.

[0025] Example 1 Please see Figures 1-3 , Figure 1 This is a schematic diagram of the structure of a retractable and adjustable magnetic self-sealing drain core provided in an embodiment of the present invention; Figure 2 An exploded structural diagram of a retractable and adjustable magnetic self-sealing drain core according to an embodiment of the present invention; Figure 3This is an exploded structural diagram of a retractable and adjustable magnetic self-sealing drain core provided in an embodiment of the present invention.

[0026] As shown in the figure, the drain core is provided with an inlet R and an outlet P along the axial direction. It includes a body 10 and an adjusting cylinder 20 that are nested together.

[0027] by Figure 2 , Figure 3 Taking the example shown, the main body 10 and the adjusting cylinder 20 are coaxially sleeved cylindrical structures, which together constitute the main frame of the drain core. The main body 10 and the adjusting cylinder 20 can be made of engineering plastics such as ABS, PP, and POM through one-piece injection molding, which has the advantages of corrosion resistance, rust prevention, low cost, and easy injection molding. The following embodiment will be described with the example of the main body 10 being sleeved on the outside of the adjusting cylinder 20.

[0028] like Figure 4 As shown, the main body 10 can be a hollow cylinder with both ends open, which is fitted on the outer periphery of the regulating cylinder 20, and relatively speaking, the end of the main body 10 away from the regulating cylinder 20 forms a water inlet R.

[0029] The regulating cylinder 20 is also embedded in the main body 10 at one end, and a drain outlet P is formed on the side wall of the end of the regulating cylinder 20 away from the main body 10 extending axially. The regulating cylinder 20 can be freely extended and retracted within the main body 10. The height of the overall drain core can be adjusted by extending and retracting the regulating cylinder 20 within the main body 10, adapting to different installation environments and avoiding water ingress or drainage problems caused by discontinuity.

[0030] Preferably, a sealing element 60 may be fitted on the outer periphery of the regulating cylinder 20 to improve the sealing between the regulating cylinder 20 and the body 10 and prevent water leakage.

[0031] In traditional drain core designs, height limitation is typically achieved between the upper and telescopic cores using friction generated by a rubber sealing ring to ensure adjustable height. However, the inventors have discovered that during long-term use, the sealing ring's coefficient of friction significantly decreases due to aging, wear, and the adhesion of microbial biofilms.

[0032] Once subjected to a large water pressure impact or external vibration, the friction between the upper core and the telescopic core is insufficient to maintain their relative position, which can easily lead to height limit failure, causing the drain core to slide down as a whole. This may cause the drain core's outlet to directly contact the rigid pipe below, hindering the normal opening and closing of its internal drainage mechanism, causing drainage difficulties or even complete blockage, while also exacerbating the risk of water ingress in the fault area.

[0033] To solve this technical problem, this embodiment improves the height limiting structure between the main body 10 and the adjusting cylinder 20. Please refer to the following for details. Figure 2 See Figures 3-6 .

[0034] At least one first limiting part 11 is provided on the inner circumferential side of the body 10 facing the adjusting cylinder 20. The first limiting part 11 can be a buckle or a protrusion that protrudes radially inward. Corresponding to the position of the first limiting part 11, the adjusting cylinder 20 is provided with an array groove 30 arranged along the axial direction of the adjusting cylinder 20 and open at one end. The array groove 30 is composed of multiple equally spaced slots. Through the snap-fit ​​engagement between the first limiting part 11 and the array groove 30, the different heights of the adjusting cylinder 20 can be adjusted in stages.

[0035] Specifically, the first limiting part 11 is disengaged from or inserted into the array groove 30 by rotating the adjusting cylinder at a preset angle to unlock or lock it. In the unlocked state, the adjusting cylinder 20 is moved along the telescopic direction to adjust the height, so as to adapt to the height difference between the drain core and the drain pipe, adapt to different installation environments, and avoid water ingress or drainage problems caused by the discontinuity.

[0036] Furthermore, the outer periphery of the adjusting cylinder 20 is sequentially divided into a first region 20A, a second region 20B, a third region 20C, and a fourth region 20D along the circumferential direction. The first region 20A and the third region 20C, as well as the second region 20B and the fourth region 20D, are arranged opposite each other in pairs. Preferably, the first region 20A, the second region 20B, the third region 20C, and the fourth region 20D are evenly divided.

[0037] The array slot 30 includes a first array slot 31 located in the first region 20A and a second array slot 32 located in the third region 20C. The first array slot 31 and the second array slot 32 have the same structure, both consisting of multiple equally spaced slots, and the circumferential length of the first array slot 31 / second array slot 32 is half the circumferential length of the first region 20A / third region 20C.

[0038] Preferably, the spacing between adjacent slots is 5mm, which can be adjusted within the range of 2-10mm according to actual needs to meet different precision adjustment requirements.

[0039] Preferably, the opening directions of the first array slot 31 and the second array slot 32 are opposite. Of course, it should be noted that the "opposite opening directions" described in this embodiment are merely illustrative examples. If viewed in the circumferential direction, the opening directions of the first array slot 31 and the second array slot 32 are in the same direction (clockwise or counterclockwise).

[0040] There can be two first limiting parts 11, each corresponding to a first array slot 31 and a second array slot 32. When the two first limiting parts 11 are respectively engaged in the first array slot 31 and the second array slot 32, they form opposing common limiting to improve structural rigidity and torsional resistance.

[0041] When the overall height of the drain core needs to be adjusted to accommodate decorative layers of different thicknesses, the user simply rotates the adjusting cylinder 20 circumferentially relative to the body 10 by a preset angle. This disengages the first limiting part 11 from the first array groove 31 and the second array groove, creating an unlocked state. In this state, the user can freely push and pull the adjusting cylinder 20 axially to adjust it to the desired height.

[0042] After adjusting to the required height, rotate the adjusting cylinder 20 in the opposite direction to the main body 10 by the same preset angle in the circumferential direction, so that the first limiting part 11 is engaged in the first array groove 31 and the second array groove 32 to achieve locking.

[0043] Preferably, the preset angle described in this embodiment is 5° to 45°. More preferably, it is 5° to 30°, so as to achieve quick and convenient adjustment.

[0044] Furthermore, one end of the opening of the first array groove 31 and the second array groove 32 is provided with an anti-detachment part 40, which can effectively prevent the first limiting part 11 from detaching from the first array groove 31 and the second array groove 32 in the natural state.

[0045] Based on the above, in this embodiment, the first region 20A, the second region 20B, the third region 20C, and the fourth region 20D are preferably all recessed regions, and the number of the first limiting parts 11 is four. The positions of the four first limiting parts 11 correspond to the first region 20A, the second region 20B, the third region 20C, and the fourth region 20D, so that the height can be effectively limited when the body 10 is fitted onto the adjusting cylinder 20 from any circumferential angle, without distinguishing the angle.

[0046] In some preferred embodiments, the drain core also includes a water seal assembly 50. The water seal assembly 50 achieves efficient odor prevention. Specifically, in some implementations... Figure 7 , Figure 8 As shown, the water seal assembly 50 includes at least an annular sealing portion 51, a bottom cover 52, a first magnet 53, and a second magnet 54.

[0047] The sealing part 51 can be made of highly elastic silicone or ethylene propylene diene monomer (EPDM) rubber, with a preferred hardness between Shore A 50 and 70 degrees, to ensure both good sealing performance and durability. Several second limiting parts 21 are provided on the inner circumference side of the adjusting cylinder 20 near the drain outlet P. The sealing part 51 is embedded in the adjusting cylinder 20 and engaged with the second limiting parts 21 to restrict axial movement of the sealing part 51.

[0048] The bottom cover 52 can be a disc-shaped or cup-shaped structure, embedded in the adjusting cylinder 20 and located on the side of the sealing part 51 near the drain port P. The bottom cover 52 can slide axially within the adjusting cylinder 20, and its travel is configured as follows: In the initial position, the bottom cover 52 is outside the axial range of the drain outlet P; When the bottom cover 52 is pushed by water pressure to move axially into the axial range of the drain outlet P, the drain outlet P is partially or completely exposed.

[0049] The first magnet 53 is embedded on the side of the bottom cover 52 away from the sealing part 51, and the second magnet 54 is fixedly set on the adjusting cylinder 20 at the position corresponding to the first magnet 53. The magnetic pole directions of the first magnet 53 and the second magnet 54 are both parallel to the axial direction of the adjusting cylinder 20, and they are arranged in a manner with the same poles facing each other, thereby generating a stable and controllable axial magnetic repulsion force.

[0050] The bottom cover 52 is pressed against the sealing part 51 by the magnetic repulsion between the first magnet 53 and the second magnet 54. Preferably, a sealing element 60 is also provided on the bottom cover 52. In the initial position, the bottom cover 52 is pressed against the sealing part 51 and a seal is achieved by the sealing element 60.

[0051] by Figure 5 For example, in the absence of water or under low water pressure, the water pressure is less than the magnetic repulsion between the first magnet 53 and the second magnet 54. The bottom cover 52 is held up by the magnetic repulsion and remains in its initial state, located outside the axial range of the drain outlet P, that is, the two are offset in the axial direction. The bottom cover 52 is pressed against the sealing part 51. The sealing member 60 forms a physical seal with the sealing part 51 and the bottom cover 52 respectively, effectively blocking the odor of the sewer and avoiding the problem of backflow.

[0052] When external water flows into the drain core, the water accumulates inside the regulating cylinder 20, generating downward water pressure on the bottom cover 52. When the water pressure exceeds the magnetic repulsion between the first magnet 53 and the second magnet 54, the bottom cover 52 overcomes the magnetic repulsion and moves downward into the axial range of the drain outlet P, exposing the drain outlet P and allowing the water to drain quickly.

[0053] As the water flows out, the water pressure gradually decreases, and the bottom cover 52 moves upward under the force of magnetic repulsion, returning to its initial position and re-pressing the sealing part 51. At this time, the small amount of water that may remain in the regulating cylinder 20 forms a water seal, effectively preventing backflow of odors.

[0054] In another specific embodiment, the outer periphery of the body 10 may also be fitted with a sealing element 60 that is compatible with the external mounting base (not shown) to prevent the possibility of lateral water leakage.

[0055] Example 2 The difference between this embodiment and Embodiment 1 lies in the form of the water seal component 50. The other technical features can be referred to the design of Embodiment 1. The following only describes the different parts in detail.

[0056] like Figure 9-11As shown, in this embodiment, the preferred water seal assembly 50 includes a bottom cover 52, a first magnet 53, and a second magnet 54. In a specific implementation, taking the figure as an example, the drain outlet P is directly formed by axially penetrating one end of the adjusting cylinder 20 away from the body 10. At the same time, one end of the bottom cover 52 is hinged to the adjusting cylinder 20 so that the bottom cover 52 can be flipped with the hinge assembly point as the fulcrum to cover / open the drain outlet P.

[0057] The first magnet 53 and the second magnet 54 are respectively fixedly mounted on the adjusting cylinder 20 and the bottom cover 52. The magnetic pole directions of the first magnet 53 and the second magnet 54 are parallel to the axial direction of the adjusting cylinder 20, and they are arranged in a way that opposite poles attract each other, thereby generating a stable and controllable axial magnetic attraction force.

[0058] In the absence of water, the bottom cover 52 is magnetically attracted by the first magnet 53 and the second magnet 54, closing onto the drain outlet P to isolate odors and prevent backflow. When water flows into the regulating cylinder, if the water pressure exceeds the magnetic attraction between the first magnet 53 and the second magnet 54, it pushes the bottom cover 52 downwards, opening the drain outlet P and allowing water to flow out quickly.

[0059] As water flows out, the water pressure gradually decreases, and the bottom cover 52 flips upward under the action of magnetic attraction, re-closing the drain outlet P. Preferably, to further improve the odor isolation effect, a sealing element 60 can be provided on the bottom cover 52 to improve the airtightness of the bottom cover 52 when it is closed with the drain outlet P.

[0060] In summary, the retractable and adjustable magnetic self-sealing drain core provided by this invention, compared with the prior art, adopts a mechanical first limiting part and an array of grooves arranged axially along the adjusting cylinder with one end open for height limiting. The first limiting part can be disengaged or engaged with the array groove by rotating the adjusting cylinder within a preset angle within a small range. This completely abandons the traditional solution that relies on friction and fundamentally solves the problem of height failure caused by aging and contamination of the sealing ring. It ensures that the drain core is stable and reliable under any working condition, perfectly adapts to various complex installation environments, and prevents the drain core from sliding down, which could cause the drain outlet of the drain core to directly abut against the rigid pipe below, hindering the normal opening and closing of its internal drainage mechanism, causing drainage difficulties or even complete blockage.

[0061] Although this document uses terms such as "body" and "adjusting cylinder" frequently, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

[0062] Furthermore, those skilled in the art should understand that although many problems exist in the prior art, each embodiment or technical solution of the present invention can be improved in only one or a few aspects, without necessarily solving all the technical problems listed in the prior art or the background art simultaneously. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as a limitation on that claim.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A retractable and adjustable magnetic self-sealing drain core, having an inlet and an outlet along the axial direction, characterized in that: The device includes a body and an adjusting cylinder that are nested together. The body is provided with at least one first limiting part. The adjusting cylinder is provided with an array of slots arranged along the axial direction of the adjusting cylinder and open at one end, corresponding to the position of the first limiting part. The first limiting part and the array slots form a snap-fit ​​engagement. Rotating the adjusting cylinder at a preset angle causes the first limiting part to disengage from or engage with the array slot, thereby unlocking or locking. In the unlocked state, the adjusting cylinder is moved along the telescopic direction to adjust the height to accommodate the height difference between the drain core and the drain pipe.

2. The retractable and adjustable magnetic self-sealing drain core according to claim 1, characterized in that: It also includes an anti-detachment part, which is located at one end of the array slot opening.

3. The retractable and adjustable magnetic self-sealing drain core according to claim 1, characterized in that: The outer periphery of the regulating cylinder is divided into a first region, a second region, a third region and a fourth region in sequence. The array groove includes a first array groove located in the first region and a second array groove located in the third region and disposed opposite to the first array groove. The opening direction of the first array groove is opposite to the opening direction of the second array groove. The adjusting cylinder is rotated at a preset angle so that the first limiting part engages with the first array slot and the second array slot respectively, forming opposing common limiting.

4. The retractable and adjustable magnetic self-sealing drain core according to claim 3, characterized in that: The first and third regions are recessed regions.

5. The retractable and adjustable magnetic self-sealing drain core according to claim 1, characterized in that: It also includes a water seal assembly, which includes a sealing part. The inner circumference of the adjusting cylinder is provided with a second limiting part, and the sealing part is engaged with the second limiting part to restrict the axial movement of the sealing part.

6. The retractable and adjustable magnetic self-sealing drain core according to claim 5, characterized in that: The sealing part is ring-shaped.

7. The retractable and adjustable magnetic self-sealing drain core according to claim 5, characterized in that: The water seal assembly also includes a bottom cover, a first magnet disposed on the bottom cover, and a second magnet disposed on the regulating cylinder corresponding to the first magnet. The bottom cover is embedded in the regulating cylinder and located on the side of the sealing part near the drain outlet. Through the magnetic repulsion force generated by the first magnet and the second magnet, the bottom cover is suspended and presses the sealing part when there is low / no water pressure, forming an initial sealing state. When the water pressure in the regulating cylinder is greater than the magnetic repulsion between the first magnet and the second magnet, the bottom cover is pushed to overcome the magnetic repulsion and move axially toward the drain outlet to expose the drain outlet and allow water to drain out; when the water pressure drops to less than the magnetic repulsion between the first magnet and the second magnet, the bottom cover is reset under the push of the magnetic repulsion and presses the sealing part.

8. The retractable and adjustable magnetic self-sealing drain core according to claim 7, characterized in that: The drain outlet is located on the side wall of the regulating cylinder and extends axially along the regulating cylinder; the axial travel of the bottom cover is configured as follows: In the initial position, the bottom cover is located outside the axial range of the drain outlet; When the bottom cover is pushed axially by water pressure to move into the axial range of the drain outlet, the drain outlet is partially or completely exposed.

9. The retractable and adjustable magnetic self-sealing drain core according to claim 7, characterized in that: The magnetic poles of the first magnet and the second magnet are parallel to the axial direction of the adjusting cylinder, and the first magnet and the second magnet are arranged with the same pole facing each other or opposite poles attracting each other.

10. The retractable and adjustable magnetic self-sealing drain core according to claim 1, characterized in that: It also includes several sealing elements, which are respectively disposed on the body, the adjusting cylinder and the bottom cover.

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