A flange pipe fitting suitable for old bathroom reconstruction

Abstract

This invention discloses a flange fitting suitable for the renovation of old bathrooms. The invention relates to the field of sewage connection technology for sanitary ware, and includes a flange assembly, an upper cylinder assembly, and a lower cylinder assembly. These three assemblies are coaxially arranged with the same inner diameter, forming a straight sewage discharge channel. The flange assembly includes a flange plate, a connecting pipe, external threads one and two, an installation notch, and a sealing gasket. The flange plate is a multi-square flat plate with a through hole in the center. Unlike traditional round flanges, the multi-square flat plate structure and the arc-shaped installation notch at the corners allow for quick alignment and precise positioning, preventing misalignment or tilting during installation. This ensures high-precision coaxiality between the toilet drain outlet and the drain pipe, resulting in smooth sewage discharge and less clogging. The square flange has a large contact area and uniform stress distribution, making it suitable for uneven floors and difficult-to-align installations in old bathrooms, significantly improving installation accuracy and stability.

Description

Technical Field

[0001] This invention relates to the field of sewage connection technology for sanitary ware, specifically to a flange fitting suitable for the renovation of old bathrooms. Background Technology

[0002] As a core sanitary fixture in the bathroom, the sealing performance, structural strength, and installation compatibility of the toilet's drain connection directly affect whether the bathroom leaks, emits odors, or clogs, impacting the quality of the living environment and building safety. This is especially true in the renovation of older bathrooms, where issues such as age, aging and deformed pipes, non-standard pipe diameters, ground subsidence, waterproofing failure, and misaligned or damaged connections are common. Traditional toilet drain connection structures are no longer sufficient to meet renovation needs, becoming a key bottleneck restricting the quality of renovations and the user experience in older bathrooms.

[0003] Existing toilet drain connection flange fittings mostly adopt a simple structure of a smooth cylinder + circular flange. The overall design is often either split-piece bonding or simply one-piece molding, only achieving basic pipe connection and lacking systematic structural design, multiple sealing designs, and precise positioning designs. In practical applications, traditional flange fittings have significant technical defects: First, insufficient structural strength, making them prone to deformation and leakage. Traditional cylinders are smooth, thin-walled structures with no external reinforcement, and the material is relatively soft, resulting in poor resistance to compression and deformation. Under long-term effects of external forces such as the impact of toilet seating, daily vibration, ground settlement, and thermal expansion and contraction, the cylinder is easily flattened, twisted, and cracked. Split-piece bonding flanges rely on manual adhesive application, resulting in inconsistent quality. The adhesive joint is prone to delamination and water leakage. Once sewage seeps into the ground floor, it is difficult to completely eliminate, easily causing problems such as leaks to downstairs neighbors, damp walls, and mold growth, seriously affecting building safety and the living environment. Second, poor positioning accuracy and unreliable sealing. Traditional flanges are round flat plates with no fixed positions, making them prone to eccentricity and misalignment during installation. Poor coaxiality between the toilet drain outlet and the sewer pipe leads to blockages in the drainage channel. Uneven stress on the round flange causes inconsistent gasket compression, resulting in localized seal failure and frequent leaks and odors, failing to fundamentally solve the sealing problem. Thirdly, they have poor adaptability and are incompatible with non-standard pipes. Older bathroom drain pipes commonly suffer from deformation, non-standard diameters, misaligned joints, and damaged pipe openings. Traditional flanges, with their single clearance fit and lack of radial sealing and dimensional compensation structures, cannot adapt to non-standard pipes and drain outlets, resulting in difficult installation, poor sealing, and high rework rates. Fourthly, they have a single sealing layer and low leak-proof redundancy. The existing structure relies solely on a single sealing ring on the upper surface of the flange, with a clearance fit between the flange body and the pipe / drain outlet, lacking radial sealing. Once this single seal fails, leakage occurs, resulting in low reliability in preventing leaks and odors.

[0004] In summary, existing toilet drain flange fittings have significant shortcomings in terms of structural strength, sealing reliability, positioning accuracy, scenario adaptability, and service life. In particular, they cannot meet the core requirements of non-standard pipes, deformed interfaces, rapid construction, and leak and odor prevention in the renovation of old bathrooms.

[0005] Therefore, we propose a flange fitting suitable for the renovation of old bathrooms to address the pain points of existing technologies and improve the quality and user experience of old bathroom renovations. Summary of the Invention

[0006] Therefore, the present invention provides a flange fitting suitable for the renovation of old bathrooms to solve the above-mentioned problems in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a flange fitting suitable for the renovation of old toilets, comprising a flange assembly, an upper cylinder assembly, and a lower cylinder assembly, wherein the flange assembly, the upper cylinder assembly, and the lower cylinder assembly are arranged coaxially and have the same inner diameter, forming a straight sewage discharge channel.

[0008] Furthermore, the flange assembly includes a flange, a connecting pipe, external thread one, external thread two, an installation notch, and a sealing gasket. The flange is a multi-square flat plate with a through hole in the center. The connecting pipe is coaxially fixed to the center of the flange and external thread one and external thread two are respectively provided on the outer periphery. Arc-shaped installation notches are provided at the corners of the flange. The sealing gasket is provided on the upper surface of the flange.

[0009] Furthermore, the upper cylinder assembly includes an upper docking cylinder, a stepped groove, an internal thread, a vertical reinforcing rib, and an annular sealing boss. The upper docking cylinder has a stepped groove on its lower inner wall and an internal thread on its inner wall, which mates with an external thread. The upper docking cylinder has an annular sealing boss on its top outer periphery and multiple sets of vertical reinforcing ribs are evenly arranged along the circumferential direction on its outer periphery.

[0010] Furthermore, the lower cylinder assembly includes a lower connecting cylinder, a stepped groove II, an internal thread II, a vertical reinforcing rib II, and guide chamfers. The upper inner wall of the lower connecting cylinder is provided with a stepped groove II, and the inner wall of the stepped groove II is provided with an internal thread II, which mates with the external thread II. The outer periphery of the lower connecting cylinder is provided with a vertical reinforcing rib II, and multiple sets of guide chamfers are evenly provided along the circumferential direction on the outer periphery of the lower connecting cylinder.

[0011] Furthermore, 8-9 vertical reinforcing ribs are evenly arranged along the circumference of the upper connecting cylinder, extending from the top to the bottom. The outer diameter of the ribs is larger than the inner diameter of the toilet drain outlet, forming an interference fit.

[0012] Furthermore, the cross-section of the annular sealing boss is semi-circular or trapezoidal, the second vertical reinforcing rib is symmetrically arranged with the first vertical reinforcing rib, and the number, size and distribution are the same, and the guide chamfer angle is 30°–45°.

[0013] Furthermore, both stepped groove one and stepped groove two are annular grooves, used for installing and connecting the upper and lower ends of the pipe, respectively.

[0014] Furthermore, the edge structure of the sealing gasket and the flange are adapted to each other, and the sealing gasket is an elastic gasket made of nitrile rubber or silicone.

[0015] This invention has the following advantages: The flange adopts a multi-square flat plate structure, which is different from the traditional round flange. The corner is set with an arc-shaped installation notch, which can realize quick alignment and precise positioning. It is not easy to be eccentric or tilted during installation, ensuring high-precision coaxiality between the toilet drain outlet and the drain pipe, and smooth sewage discharge is not easy to block. The square flange has a large contact area and uniform force distribution, which is suitable for old bathrooms with uneven floors and difficult installation alignment, greatly improving installation accuracy and stability.

[0016] The upper cylinder assembly has 8-9 vertical reinforcing ribs on its outer periphery, and the lower cylinder assembly has symmetrical vertical reinforcing ribs on its inner periphery. The reinforcing ribs are evenly distributed along the circumference of the cylinder and extend from the top to the bottom, integrating rigidly with the cylinder body. This significantly improves the radial rigidity and compression resistance of the cylinder body, effectively preventing the cylinder body from being flattened or twisted under pressure. It also eliminates stress concentration, avoids breakage caused by long-term vibration and ground settlement, extends service life, and is suitable for the complex working conditions of old bathrooms with long-term vibration and uneven stress.

[0017] The top of the upper connecting cylinder is equipped with an annular sealing boss, the outer diameter of which is larger than the inner diameter of the toilet drain outlet to form an interference fit and achieve radial high-pressure sealing; the upper surface of the flange is equipped with a nitrile rubber or silicone elastic sealing gasket to achieve axial water seal at the bottom of the toilet; the upper and lower cylinders are respectively equipped with sealing rings through annular stepped grooves to radially seal with the connecting pipe, forming a triple independent sealing layer that complements each other and has high redundancy, completely blocking the sewage leakage and odor backflow channels, and solving the stubborn problems of water seepage and odor backflow in old toilets.

[0018] The flange assembly, upper cylinder assembly, and lower cylinder assembly are arranged coaxially with the same inner diameter, forming a straight sewage discharge channel without bends or diameter reductions, ensuring smooth sewage flow and preventing sedimentation and blockage. The bottom of the lower cylinder is equipped with a 30°–45° guide chamfer, which facilitates the insertion of deformed or non-standard sewage pipes, automatically aligns to reduce installation resistance, and is compatible with non-standard pipes with non-standard diameters and deformed interfaces in old bathrooms, resulting in low installation difficulty and low rework rate.

[0019] The upper cylinder assembly mates with the flange assembly's external thread one via internal thread one, and the lower cylinder assembly mates with the flange assembly's external thread two via internal thread two, achieving a detachable threaded connection that facilitates easy installation and disassembly. Attached Figure Description

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0022] Figure 1 This is a structural schematic diagram of a flange fitting suitable for the renovation of old bathrooms according to the present invention.

[0023] Figure 2 This is a schematic diagram showing the disassembled structure of a flange fitting suitable for the renovation of old bathrooms according to the present invention.

[0024] Figure 3 This is a schematic diagram of the top structure of a flange assembly in a flange pipe fitting suitable for the renovation of old bathrooms according to the present invention.

[0025] Figure 4 This is a schematic diagram of the bottom structure of a flange assembly in a flange pipe fitting suitable for the renovation of old bathrooms according to the present invention.

[0026] Figure 5 This is a schematic diagram of the upper cylinder assembly in a flange pipe fitting suitable for the renovation of old bathrooms according to the present invention.

[0027] Figure 6 This is a schematic diagram of the lower cylinder assembly of a flange pipe fitting suitable for the renovation of old bathrooms according to the present invention.

[0028] In the diagram: 1. Flange assembly; 11. Flange; 12. Connecting pipe; 13. External thread one; 14. External thread two; 15. Mounting notch; 16. Sealing gasket; 2. Upper cylinder assembly; 21. Upper connecting cylinder; 22. Stepped groove one; 23. Internal thread one; 24. Vertical reinforcing rib one; 25. Annular sealing boss; 3. Lower cylinder assembly; 31. Lower connecting cylinder; 32. Stepped groove two; 33. Internal thread two; 34. Vertical reinforcing rib two; 35. Guide chamfer. Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0030] like Figures 1 to 6 As shown, a flange fitting suitable for the renovation of old toilets includes a flange assembly 1, an upper cylinder assembly 2, and a lower cylinder assembly 3. The flange assembly 1, the upper cylinder assembly 2, and the lower cylinder assembly 3 are arranged coaxially with the same inner diameter, forming a straight sewage discharge channel.

[0031] Specifically, the flange fitting is mainly composed of three parts: flange assembly 1, upper cylinder assembly 2, and lower cylinder assembly 3. The flange assembly 1, upper cylinder assembly 2, and lower cylinder assembly 3 are strictly coaxially arranged with completely consistent inner diameters, forming a full-through straight sewage discharge channel without bends, diameter reductions, or obstructions, ensuring smooth sewage flow, preventing sedimentation, and reducing clogging. This addresses the pain points of poor sewage discharge and easy clogging in old bathrooms.

[0032] The flange assembly 1 includes a flange 11, a connecting pipe 12, an external thread 13, an external thread 14, an installation notch 15, and a gasket 16. The flange 11 is a polygonal flat plate with a through hole in the center. The connecting pipe 12 is coaxially fixed to the center of the flange 11. External threads 13 and 14 are respectively provided on the outer periphery. Arc-shaped installation notches 15 are provided at the corners of the flange 11. The gasket 16 is provided on the upper surface of the flange 11. The gasket 16 and the edge structure of the flange 11 are compatible. The gasket 16 is an elastic gasket and is made of nitrile rubber or silicone.

[0033] Specifically, flange assembly 1, as the intermediate core load-bearing, positioning, sealing and connecting component, is located between upper cylinder assembly 2 and lower cylinder assembly 3, and undertakes key functions such as connection of the three, installation positioning, axial sealing and ground fixing;

[0034] Flange 11 features a multi-square flat structure, preferably square, unlike traditional round flanges. The square structure offers precise positioning, a large contact area, uniform stress distribution, and strong stability, making it particularly suitable for older bathrooms with uneven floors and difficult installation alignment. A circular through-hole, coaxial with the cylinder body, is located in the center of flange 11, with a diameter matching the inner diameter of the cylinder body, ensuring a straight drainage channel. Flange 11 is thicker than the cylinder body wall, guaranteeing sufficient load-bearing strength, deformation resistance, and structural stability, preventing bending, deformation, and cracking under pressure. Arc-shaped installation notches 15 are provided at the corners of flange 11, symmetrically distributed along the diagonal, for expansion bolts or fixing bolts to pass through, enabling quick alignment, precise positioning, and secure fixing of flange 11 to the ground and toilet base. This prevents misalignment, tilting, and unevenness during installation, significantly improving the accuracy and efficiency of installation in older bathroom renovations.

[0035] The connecting pipe 12 is coaxially fixed to the center through hole of the flange 11, extending upward to connect with the upper cylinder assembly 2 and downward to connect with the lower cylinder assembly 3, serving as an intermediate connection transition section to ensure that the three are coaxial, have the same inner diameter, and have a straight sewage discharge channel; the upper outer periphery of the connecting pipe 12 is integrally formed with an external thread 13, and the lower outer periphery is integrally formed with an external thread 14, which are used to precisely match the internal threads of the upper cylinder assembly 2 and the lower cylinder assembly 3, respectively, to achieve a detachable threaded connection, which facilitates quick on-site installation, disassembly, maintenance, and replacement of seals without damaging the waterproofing of the ground or removing the toilet, making it suitable for the convenient maintenance needs of old bathrooms;

[0036] The sealing gasket 16 is an annular elastic gasket, located on the upper surface of the flange 11. The edge structure of the sealing gasket 16 is perfectly matched with the edge structure of the flange 11, ensuring that the sealing gasket 16 is centered, without offset, and without wrinkles. The sealing gasket 16 is made of nitrile rubber or silicone, which has high elasticity, high wear resistance, high aging resistance, high corrosion resistance, and high sealing performance, making it suitable for the humid and acid- and alkaline corrosive environment of the bathroom. The inner diameter of the sealing gasket 16 is slightly smaller than the through hole of the cylinder, and the outer diameter is slightly smaller than the side length of the flange 11. During installation, it is evenly pressed by the toilet base, undergoing elastic deformation, and tightly filling the tiny gap between the flange 11 and the toilet base, achieving radial and axial double sealing. This effectively prevents sewage from seeping out from the bottom and odor from rising from the bottom, providing a stable, reliable, and long-lasting sealing effect, solving the stubborn problems of water seepage and odor backflow in old bathrooms.

[0037] The upper cylinder assembly 2 includes an upper connecting cylinder 21, a stepped groove 22, an internal thread 23, a vertical reinforcing rib 24, and an annular sealing boss 25. The upper connecting cylinder 21 has a stepped groove 22 on its lower inner wall and an internal thread 23 on its inner wall. The internal thread 23 mates with the external thread 13. The upper connecting cylinder 21 has an annular sealing boss 25 on its top outer periphery. Multiple sets of vertical reinforcing ribs 24 are evenly arranged along the circumference of the upper connecting cylinder 21. There are 8-9 vertical reinforcing ribs 24 evenly arranged along the circumference of the upper connecting cylinder 21, running from the top to the bottom. The annular sealing boss 25 has a semi-circular or trapezoidal cross section, with an outer diameter larger than the inner diameter of the toilet drain outlet, forming an interference fit.

[0038] Specifically, the upper cylinder assembly 2, as an upper docking, radial sealing, and positioning guide component, is located above the flange assembly 1 and is used to precisely insert into the toilet drain outlet to achieve upper radial high-pressure sealing and coaxial guiding positioning.

[0039] The upper connecting cylinder 21 is a vertical cylindrical structure with an inner diameter that is exactly the same as the inner diameter of the connecting pipe 12, ensuring that the sewage discharge channel is straight and unobstructed. The lower inner wall of the upper connecting cylinder 21 is integrally formed with a stepped groove 22, which is an annular groove. The inner diameter of the groove is preferably larger than the inner diameter of the cylinder, which is used to accurately install the sealing ring and achieve radial sealing between the upper connecting cylinder 21 and the upper end of the connecting pipe 12, further improving the sealing level and reliability. The inner wall of the stepped groove 22 is integrally formed with an internal thread 23, which is completely matched with the external thread 13. The thread engagement is tight and the sealing is reliable, realizing a detachable threaded connection between the upper cylinder assembly 2 and the flange assembly 1, which is convenient to disassemble and assemble and has a firm seal.

[0040] The top outer circumference of the upper connecting cylinder 21 is integrally formed with an annular sealing boss 25. The annular sealing boss 25 has a semi-circular or trapezoidal cross section, which is simple to process and has a good sealing effect. The outer diameter of the annular sealing boss 25 is slightly larger than the inner diameter of the toilet drain outlet, forming an interference fit. During installation, the annular sealing boss 25 is smoothly pressed into the toilet drain outlet, undergoes elastic deformation, and tightly fits the inner wall of the drain outlet to achieve radial high-pressure sealing. This effectively prevents sewage from leaking from the interface gap and odor from returning from the interface gap. It has a high sealing level, large redundancy, and strong reliability, and is suitable for the pain points of deformed drain outlets, non-standard diameters, and poor sealing in old bathrooms.

[0041] Multiple sets of vertical reinforcing ribs 24 are evenly arranged along the circumference of the outer wall of the upper connecting cylinder 21. There are 8-9 vertical reinforcing ribs 24 evenly arranged along the circumference of the upper connecting cylinder 21, distributed at equal angles, with uniform distribution and balanced force. The vertical reinforcing ribs 24 run from the top of the upper connecting cylinder 21 to the bottom, rigidly integrated with the cylinder wall. The vertical reinforcing ribs 24 can significantly improve the radial rigidity, compression resistance, deformation resistance and vibration resistance of the upper connecting cylinder 21, effectively preventing the cylinder from being flattened, twisted, deformed and cracked under pressure, greatly improving the structural strength, stability and service life, solving the core pain points of traditional cylinders with poor strength, easy deformation and leakage, and adapting to the complex working conditions of old bathroom floors with settlement, long-term vibration and uneven force.

[0042] The lower cylinder assembly 3 includes a lower connecting cylinder 31, a stepped groove 32, an internal thread 33, a vertical reinforcing rib 34, and a guide chamfer 35. The upper inner wall of the lower connecting cylinder 31 is provided with a stepped groove 32, and the inner wall of the stepped groove 32 is provided with an internal thread 33, which mates with the external thread 14. The outer periphery of the lower connecting cylinder 31 is provided with a vertical reinforcing rib 34. Multiple sets of guide chamfers 35 are evenly provided along the circumferential direction on the outer periphery of the lower connecting cylinder 31. The vertical reinforcing ribs 34 and the vertical reinforcing ribs 24 are symmetrically arranged, with the same number, size, and distribution. The angle of the guide chamfer 35 is 30°–45°. The stepped groove 22 and the stepped groove 32 are both annular grooves, which are used to install and connect the upper and lower ends of the pipe 12, respectively.

[0043] Specifically, the lower cylinder assembly 3, as the lower docking, radial sealing, and guide centering component, is located below the flange assembly 1 and is used to accurately insert into the ground sewer pipe to achieve lower radial sealing and guide centering positioning;

[0044] The lower connecting cylinder 31 is a vertical cylindrical structure with an inner diameter that is completely consistent with the inner diameter of the connecting pipe 12 and the upper connecting cylinder 21, forming a full-through straight sewage discharge channel without bends, narrowing, or obstructions, ensuring smooth sewage discharge, preventing sedimentation, and reducing clogging. The upper inner wall of the lower connecting cylinder 31 is integrally formed with a stepped groove 32, which is an annular groove with dimensions identical to the stepped groove 22, for precise installation of the sealing ring, achieving radial sealing between the lower connecting cylinder 31 and the lower end of the connecting pipe 12, further enhancing the sealing level and reliability. The inner wall of the stepped groove 32 is integrally formed with an internal thread 33, the internal thread specification of which is perfectly matched with the external thread 14, ensuring tight thread engagement and reliable sealing, enabling a detachable threaded connection between the lower cylinder assembly 3 and the flange assembly 1, facilitating easy assembly and disassembly and ensuring a secure seal.

[0045] Multiple sets of vertical reinforcing ribs 34 are evenly arranged along the circumferential direction on the outer wall of the lower connecting cylinder 31. The vertical reinforcing ribs 34 are symmetrically arranged with the vertical reinforcing ribs 24, and their quantity, size, and distribution are completely identical. They run from the upper end to the bottom end of the lower connecting cylinder 31 and are rigidly integrated with the cylinder wall. The vertical reinforcing ribs 34 can significantly improve the radial rigidity, compression resistance, deformation resistance, and vibration resistance of the lower connecting cylinder 31, effectively preventing the cylinder from being squeezed, deformed, twisted, or cracked when inserted into the pipe. This greatly improves the structural strength, stability, and service life, solving the core pain points of traditional cylinders, such as poor strength, easy deformation, and leakage. At the same time, the vertical reinforcing ribs 24 and 34 are symmetrical, continuous, and rigidly integrated, and are integrally formed with the upper and lower surfaces of the flange 11 to form an integrated rigid load-bearing structure of "cylinder + reinforcing rib + flange". This completely eliminates stress concentration, greatly improves fracture resistance, and makes it less prone to breakage or damage during long-term use. It is suitable for complex working conditions such as floor settlement, long-term vibration, and uneven stress in old bathrooms.

[0046] The bottom outer circumference of the lower connecting cylinder 31 is integrally formed with a guide chamfer 35. The guide chamfer 35 has an angle of 30°–45° and is smooth, without burrs or sharp corners. The guide chamfer 35 facilitates quick guidance and automatic centering when inserting into the ground drain pipe, reduces insertion resistance, and avoids bumps, deformation, and damage to the end of the cylinder. It greatly reduces the difficulty of installation and improves the efficiency of installation. It is especially suitable for old bathroom drain pipes that are deformed, have non-standard diameters, misaligned interfaces, or damaged pipe openings. It automatically compensates for dimensional deviations and reduces the rework rate.

[0047] The positioning principle of the square flange: The flange 11 adopts a polygonal square plate with a corner arc installation notch 15, which is different from the traditional circular flange ring structure without fixed point limit. The square flange has multi-sided limit and multi-corner opening for fixed point. After the bolts are locked through the arc installation notch 15, a multi-point constraint limit is formed. During installation, the flange 11 is locked by multi-point limit, which restricts the radial sliding and deflection of the flange. Relying on the large area plate to evenly fit the uneven old ground, the overall pipe fitting is constrained from the installation reference end to ensure coaxiality. This prevents the toilet drain outlet and the sewer pipe from being installed off-center or crooked, and achieves precise physical fixed point alignment.

[0048] The triple-seal deformation principle: This device forms a three-stage independent elastic deformation sealing structure, each relying on assembly compression to generate elastic deformation to achieve sealing: First, the nitrile rubber or silicone sealing gasket 16 at the upper end of the flange undergoes planar compression deformation under the axial pressure of the toilet base, filling the gap between the toilet base and the ground flange, forming an axial bottom layer seal; Second, the annular sealing boss 15 at the top of the upper connecting cylinder 21 is pressed into the toilet drain outlet and undergoes radial contraction deformation under the pressure of the orifice, interfering with the inner wall to achieve an upper radial seal; Third, the sealing rings built into the stepped groove 22 and stepped groove 32 inside the upper and lower cylinders are radially expanded and deformed by the end face of the connecting pipe 12 after the threads are tightened, filling the assembly gap between the cylinder and the connecting pipe 12 to achieve a middle radial seal; The three seals deform independently and are redundant with each other, and if one seal fails, the remaining two stages can still block the leakage of odor.

[0049] The principle of the reinforcing ribs: Vertical reinforcing ribs 1-24 and 2-34 are evenly arranged along the circumference on the upper and lower cylinder surfaces and run through the cylinder sidewalls at full height. The reinforcing ribs are integrally injection molded with the cylinder wall to form a rib plate reinforcement structure. The impact load of the toilet seat, the extrusion stress of ground settlement, and the deformation stress of pipe thermal expansion and contraction are no longer concentrated on the thin wall of the cylinder, but are dispersed and transmitted to the central square flange surface along multiple vertical reinforcing ribs. The pressure is then distributed from the large-area flange to the old ground, dispersing the pressure at a single point and preventing the cylinder from being dented, twisted and cracked under pressure. The rib plate structure improves the overall bending and extrusion resistance of the pipe fittings.

[0050] The principle of automatic correction by bottom chamfer: The lower end of the connecting cylinder 31 has a 30°~45° guide chamfer 35 to form a conical guide structure. When the pipe opening of an old sewer pipe is crooked or the inner diameter is non-standard, the chamfered conical surface is automatically radially fine-tuned by the reaction force of the inclined surface of the inner wall of the pipe opening during the insertion process. The component force of the conical guide is used to drive the entire pipe fitting to move slightly to align, passively correct the coaxial deviation of the installation, and automatically adapt to the deformed and eccentric non-standard sewer pipe opening.

[0051] The square flange 11 provides an overall installation reference positioning, eliminating eccentricity from the bottom and providing a flat assembly base for uniform pressure deformation of the triple seal; without the square flange 11 for fixed-point positioning, the toilet will be installed crookedly, which will cause uneven local stress on the sealing gasket and inconsistent sealing compression, and the triple seal structure will not be able to play its full-area sealing role.

[0052] The full-length reinforcing ribs bear the external force of ground settlement and transmit it to the square flange to distribute the load, preventing the cylinder from being deformed and squeezed, thus preventing damage to the boss seal and the built-in sealing ring of the stepped groove. This ensures the stability of the triple seal under long-term deformation. Without the reinforcing ribs to resist deformation, settlement and squeezing can easily cause the cylinder to deform, the seal to fail, and water to leak.

[0053] The bottom guide chamfer of 35° automatically corrects the coaxiality error of the drain pipe, and works in conjunction with the upper square flange 11 for fixed-point locking, constraining the coaxiality of the pipe fittings in both directions. This not only solves the problem of misalignment of non-standard pipes at the bottom, but also ensures that the upper annular sealing boss accurately engages with the toilet drain outlet, guaranteeing an effective interference seal. Without the chamfer, the automatic centering will cause the lower pipe to be off-center, which will lead to the offset of the upper pipe fittings, and the annular sealing boss will not be able to uniformly achieve an interference seal.

[0054] The three-section threaded detachable structure integrates the four major functional components into a single pipeline, realizing a straight-through sewage discharge channel without diameter reduction. Based on the above structural combination, the whole system achieves four core functions of old renovation at one time: anti-installation eccentricity, resistance to ground settlement and deformation, triple redundancy for seepage and odor prevention, and compatibility with non-standard deformable sewage pipes. This overall integrated effect cannot be achieved by any single structure or existing scattered parts alone, forming a combined invention effect that is different from existing technologies.

[0055] This flange fitting, suitable for the renovation of old bathrooms, is used in practice as follows:

[0056] Precisely place the upper sealing ring into the stepped groove 22 and the lower sealing ring into the stepped groove 32, ensuring that the sealing rings are flat, without twisting or offset; align the internal thread 23 of the upper cylinder assembly 2 with the external thread 13 of the flange assembly 1, and tighten clockwise smoothly to ensure proper thread engagement and tight seal; align the internal thread 33 of the lower cylinder assembly 3 with the external thread 14 of the flange assembly 1, and tighten clockwise smoothly to ensure proper thread engagement and tight seal; place the sealing gasket 16 flat on the upper surface of the flange 11, ensuring that the sealing gasket is centered, without wrinkles or offset, thus completing the pipe assembly;

[0057] Clean up debris, dust, oil stains, and old sealing materials around the drain pipe openings on the old bathroom floor to ensure that the floor is flat, clean, dry, without bumps or depressions, and to ensure that the flange 11 fits tightly and is installed stably.

[0058] Place the assembled pipe fittings vertically and stably. Align the bottom guide chamfer 35 of the lower cylinder assembly 3 precisely with the ground drain pipe opening. Gently and evenly press down and smoothly insert the lower connecting cylinder 31 into the drain pipe until the lower surface of the flange 11 is tightly fitted and leveled with the ground. Ensure that the pipe fittings are vertical, without tilting or shaking, and adapt to scenarios where old pipes are deformed, have non-standard diameters, or have crooked interfaces.

[0059] Move the toilet to the installation position, accurately align the toilet drain outlet with the annular sealing boss 25 at the top of the upper cylinder assembly 2, and slowly and steadily press down to sit, so that the annular sealing boss 25 and the toilet drain outlet are tightly pressurized and elastically deformed into place, achieving a double seal of upper radial seal and bottom axial seal.

[0060] By using the arc-shaped installation notch 15 at the corner of flange 11, the expansion bolts are passed through to firmly fix flange 11 to the ground, ensuring that the bolts are evenly stressed, without loosening or shifting, thus completing the toilet drain connection installation. The construction is convenient, fast and efficient.

[0061] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

[0062] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

Claims

1. A flange fitting suitable for the renovation of old bathrooms, characterized in that, It includes a flange assembly (1), an upper cylinder assembly (2), and a lower cylinder assembly (3). The flange assembly (1), the upper cylinder assembly (2), and the lower cylinder assembly (3) are arranged coaxially with the same inner diameter, forming a straight sewage discharge channel.

2. A flange fitting suitable for the renovation of old bathrooms according to claim 1, characterized in that, The flange assembly (1) includes a flange (11), a connecting pipe (12), an external thread one (13), an external thread two (14), an installation notch (15), and a sealing gasket (16). The flange (11) is a multi-square plate with a through hole in the center. The connecting pipe (12) is coaxially fixed to the center of the flange (11), and external threads one (13) and two (14) are respectively provided on the outer periphery. Arc-shaped installation notches (15) are provided at the corners of the flange (11). The sealing gasket (16) is provided on the upper surface of the flange (11).

3. A flange fitting suitable for the renovation of old bathrooms according to claim 1, characterized in that, The upper cylinder assembly (2) includes an upper docking cylinder (21), a stepped groove (22), an internal thread (23), a vertical reinforcing rib (24), and an annular sealing boss (25). The upper docking cylinder (21) has a stepped groove (22) on its lower inner wall and an internal thread (23) on its inner wall. The internal thread (23) is engaged with the external thread (13). The upper docking cylinder (21) has an annular sealing boss (25) on its top outer periphery and multiple sets of vertical reinforcing ribs (24) are evenly arranged along the circumferential direction on the outer periphery of the upper docking cylinder (21).

4. A flange fitting suitable for the renovation of old bathrooms according to claim 1, characterized in that, The lower cylinder assembly (3) includes a lower docking cylinder (31), a stepped groove (32), an internal thread (33), a vertical reinforcing rib (34), and a guide chamfer (35). The upper inner wall of the lower docking cylinder (31) is provided with a stepped groove (32), and the inner wall of the stepped groove (32) is provided with an internal thread (33), and the internal thread (33) is engaged with the external thread (14). The outer periphery of the lower docking cylinder (31) is provided with a vertical reinforcing rib (34), and multiple sets of guide chamfers (35) are evenly provided along the circumferential direction on the outer periphery of the lower docking cylinder (31).

5. A flange fitting suitable for the renovation of old bathrooms according to claim 3, characterized in that, The vertical reinforcing ribs (24) are evenly arranged in 8-9 circumferences along the upper connecting cylinder (21), extending from the top to the bottom. The annular sealing boss (25) has a semi-circular or trapezoidal cross section, with an outer diameter larger than the inner diameter of the toilet drain outlet, forming an interference fit.

6. A flange fitting suitable for the renovation of old bathrooms according to claim 4, characterized in that, The second vertical reinforcing rib (34) is symmetrically arranged with the first vertical reinforcing rib (24), and the number, size and distribution are the same. The guide chamfer (35) has an angle of 30°–45°.

7. A flange fitting suitable for the renovation of old bathrooms according to claim 3, characterized in that, The stepped groove one (22) and stepped groove two (32) are both annular grooves, which are used to install and connect the upper and lower ends of the pipe (12), respectively.

8. A flange fitting suitable for the renovation of old bathrooms according to claim 2, characterized in that, The edge structure of the sealing gasket (16) and the flange (11) are compatible. The sealing gasket (16) is an elastic gasket and is made of nitrile rubber or silicone.

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