Household drainage hub

Abstract

The utility model relates to the technical field of household drainage pipelines, in particular to a household drainage hub which comprises a drainage pipe used for being communicated with a building drainage vertical pipe, an indoor drainage hub used for being communicated with the drainage pipe and at least one indoor drainage branch pipe communicated with the indoor drainage hub. A first air and water return prevention assembly is arranged at the position, close to the position connected with the indoor drainage hub, in the drainage pipe. The anti-reverse-air structure of the drainage pipeline has the effect that the anti-reverse-air structure of the drainage pipeline can be suitable for a home-entry drainage system with multiple intersected branches.

Description

Technical Field

[0001] This application relates to the technical field of household drainage pipes, and in particular to a household drainage hub. Background Technology

[0002] In modern household drainage systems, domestic wastewater from areas such as kitchens, bathrooms, laundry rooms, and balconies is collected through various indoor drainage branch pipes and discharged into the municipal sewer network via building drainage risers and outdoor horizontal pipes. Because the drainage process involves gas emissions, a negative pressure environment can easily form inside the pipes, causing malodorous gases such as hydrogen sulfide and methane from the sewer to backflow into the household through branch pipes, posing health risks and compromising living comfort.

[0003] In related technologies, the indoor drainage branch pipe is connected to the discharge pipe through a three-way / four-way valve. The anti-backflow structure is installed inside the indoor drainage branch pipe. The anti-backflow structure mainly achieves unidirectional flow through structures such as float seals and baffles, thereby preventing odorous gases from returning to the indoor environment.

[0004] Regarding the aforementioned technologies, the household drain pipe, as a core node where multiple branches converge, experiences frequent changes in water flow direction and large pressure fluctuations, and is often in a half-full or waterlogged state. Traditional branch anti-backflow devices are difficult to adapt to the complex working conditions of the main drain pipe, becoming the root cause of odor backflow. Moreover, they are prone to clogging at the three-way and four-way valve nodes, making them inconvenient to unclog and clean. In addition, although existing anti-backflow structures have achieved certain results in preventing backflow in branch pipes, they are not suitable for drain pipes where multiple branches converge. Utility Model Content

[0005] In order to make the backflow prevention structure of the drainage pipe applicable to the inlet drainage system with multiple branch intersections, this application provides a household drainage hub.

[0006] The technical solution for a household drainage hub provided in this application is as follows:

[0007] A household drainage hub includes a discharge pipe for connecting to a building drainage riser, an indoor drainage hub for connecting to the discharge pipe, and at least one indoor drainage branch pipe connected to the indoor drainage hub.

[0008] The inside of the discharge pipe is provided with a first anti-backflow and anti-water component near the location where it connects to the indoor drainage hub.

[0009] By adopting the above technical solution, a first anti-backflow and anti-water component is installed inside the discharge pipe near the connection point to the indoor drainage hub. This directly addresses the backflow prevention at the core node where multiple branches converge. Compared to the traditional method of installing anti-backflow structures at the ends of each indoor drainage branch pipe, this solution is better suited to complex conditions such as frequent changes in water flow direction, large pressure fluctuations, and prolonged periods of partial or standing water in the discharge pipe. This more effectively prevents malodorous gases such as hydrogen sulfide and methane from the sewer from flowing back into the household through the discharge pipe. Because the internal structure of three-way / four-way valves is complex, water flow is easily obstructed, affecting drainage speed. In this solution, the indoor drainage branch pipe replaces the three-way / four-way valve, increasing the water flow area inside the pipe. The water flow velocity within the pipe is relatively stable and less prone to eddy currents. Impurities and dirt are less likely to accumulate and deposit inside the pipe, thus improving drainage efficiency and facilitating unblocking. Compared to the complex internal structure of three-way / four-way valves, the branch pipe allows impurities carried in wastewater to be discharged smoothly, reducing the possibility of blockage in the drainage pipes. This makes the flow of domestic wastewater from the indoor drainage branch pipe through the indoor drainage hub to the discharge pipe smoother, reducing water flow obstruction and backlog, and improving the drainage efficiency of the entire household drainage system.

[0010] Furthermore, the first anti-backflow and anti-water component is detachably connected to the discharge pipe, the indoor drainage hub is provided with an inspection port, and the indoor drainage hub is provided with a sealing component at the top for sealing the inspection port.

[0011] By adopting the above technical solution, the indoor drainage hub is equipped with an inspection port, providing maintenance personnel with a channel to inspect and maintain the internal pipes. Maintenance personnel can directly observe the internal condition of the pipes through the inspection port, promptly identifying problems without resorting to other complex methods to probe the pipe's interior. The anti-backflow and anti-airflow component is detachably connected to the discharge pipe. In case of equipment failure or component aging, there is no need for large-scale disassembly of the entire drainage system. Maintenance personnel can easily remove the anti-backflow and anti-airflow component from the inspection port for inspection, repair, or replacement, reducing maintenance costs and difficulty. The sealing component at the top of the indoor drainage hub covers the inspection port, preventing debris, dust, etc., from entering and causing blockages or damage to internal pipe components. Simultaneously, the sealing component also provides a sealing effect, preventing odors from escaping from the inspection port and maintaining a clean and hygienic indoor environment.

[0012] Furthermore, the bottom height of the indoor drainage branch pipe is higher than the bottom height of the discharge pipe, thus forming a height difference H1. The water flow generates water pressure through the height difference H1, thereby forcing the first anti-backflow and anti-water component to open.

[0013] By adopting the above technical solution, when draining water through one or more indoor drainage branch pipes, the height of the indoor drainage branch pipe is higher than the bottom height of the discharge pipe. This allows the water in the draining indoor drainage branch pipe to be discharged through the discharge pipe first, making it less likely for sewage to enter adjacent indoor drainage branch pipes. At the same time, the sewage opens the anti-backflow and anti-airflow component due to water pressure. Furthermore, the height difference H1 between the two allows the first anti-backflow and anti-airflow component to open due to water pressure before the sewage reaches the bottom of the indoor drainage branch pipe, preventing excessive water accumulation from entering other indoor drainage branch pipes.

[0014] Furthermore, the indoor drainage hub is detachably installed with a water-blocking sleeve inside the inspection port, and the bottom height of the water-blocking sleeve is lower than the bottom height of the indoor drainage branch pipe, thus forming a height difference H2.

[0015] By adopting the above technical solution, when sewage is discharged from the indoor drainage branch pipe, it is blocked by the water-blocking sleeve. It first impacts the water-blocking sleeve and then falls into the bottom of the drainage hub, preventing it from directly flowing into other pipes. This also avoids excessive water flow and reduces the impact on the first anti-backflow and anti-water component installed on the discharge pipe.

[0016] Furthermore, the sealing assembly includes a second anti-backflow and anti-water component and a cover assembly. The second anti-backflow and anti-water component is located inside the inspection port and is detachably connected to the indoor drainage hub. The cover assembly includes a cover top plate and a mounting frame for placing the cover top plate. The cover top plate has a drain hole.

[0017] By adopting the above technical solution, a floor drain can be formed at the upper end of the inspection port. The second anti-backflow and anti-water component prevents gas or sewage from gushing out of the indoor drainage hub. At the same time, the drain hole on the cover component can collect the water above and discharge it into the indoor drainage hub through the second anti-backflow and anti-water component, and then discharge it through the drain pipe.

[0018] Furthermore, the second anti-backflow and anti-water-backflow component includes an inner shell, a reset connecting rod, and a cap. The inner shell is detachably connected to the indoor drainage hub and extends into the inspection port. The reset connecting rod is installed at the central axis position of the inner shell, and the cap is fixedly connected to the lower end of the reset connecting rod.

[0019] By adopting the above technical solution, the inner shell is coaxially installed within the connecting shell, ensuring the stability of the entire component structure. The reset connecting rod is installed at the central axis of the inner shell, allowing the cap to maintain balance during movement and accurately align with the corresponding part of the drainage pipe. The cap is fixedly connected to the lower end of the reset connecting rod. When draining, the pressure of the water flow causes the cap to open, allowing water to pass smoothly. After draining, the cap quickly resets under the action of the reset connecting rod, tightly sealing the drain outlet and preventing gas in the sewer from returning to the room through the pipe, thus avoiding indoor pollution from odors and harmful gases.

[0020] Furthermore, the first anti-backflow and anti-water-backflow component includes an opening and closing structure and an installation collar for installing the opening and closing structure, the installation collar being snapped onto the inner wall of the discharge pipe.

[0021] By adopting the above technical solution, the mounting collar can be detachably connected to the discharge pipe, which facilitates the installation and disassembly of the entire first anti-backflow and anti-water component. When inspecting, cleaning or replacing the first anti-backflow and anti-water component, the mounting collar can be directly removed from the discharge pipe to take out the housing, which is more convenient.

[0022] Furthermore, the opening and closing structure includes a fixed baffle integrally connected with the mounting collar and a movable baffle for blocking water. The fixed baffle has an opening that matches the movable baffle and allows water to flow through. The fixed baffle is provided with a hinge seat for mounting the movable baffle at a position near the top inner wall of the discharge pipe. The movable baffle is provided with a movable shaft on its side edge. The hinge seat has a rotating groove for the movable shaft to be engaged and rotated.

[0023] By adopting the above technical solution, the movable baffle is connected to the hinge seat on the fixed baffle via a movable shaft. This connection method is simple and reliable, and also facilitates the installation and replacement of the movable baffle. If the movable baffle is damaged, it can be removed and replaced simply by disassembling the movable shaft, without the need for large-scale disassembly of the entire structure. The movable baffle, connected by the hinge seat and movable shaft, can automatically adjust its angle according to the size and direction of the water flow in the discharge pipe. When the water flow is large, the movable baffle can automatically open to a certain angle, making drainage smoother and avoiding drainage problems or even blockages caused by water flow obstruction. When the water flow is small, the movable baffle can remain closed, better blocking odor gases and adapting to the complex and changing water flow conditions in the discharge pipe.

[0024] Furthermore, the movable baffle is inclined outward from the side connected to the hinge seat to the side away from the indoor drainage hub, and the fixed baffle is provided with an extension near the bottom of the discharge pipe for abutting the movable baffle.

[0025] By adopting the above technical solution, an extension is provided on the fixed baffle near the bottom of the discharge pipe to support the movable baffle. When the movable baffle is impacted by water flow or gas pressure, the extension can hold the movable baffle in place, preventing it from shaking or shifting excessively, thus ensuring the stability and reliability of the anti-backflow and anti-gas / water components. After drainage is completed, the movable baffle, under its own weight and the possible residual pressure of the water flow, can more easily return to the closed position by relying on its tilt angle and the support of the extension, achieving automatic reset. It can also fit tightly with the extension to form a good seal, effectively preventing malodorous gases in the sewer from flowing back into the house through the connection between the discharge pipe and the indoor drainage hub. The movable baffle slopes outward from the side connected to the hinge seat to the side away from the indoor drainage hub. This sloped design makes good use of the impact force of the water flow. When sewage flows from the indoor drainage hub to the discharge pipe, the sloped baffle is easily opened, ensuring smooth drainage. When sewage tends to flow from the discharge pipe to the indoor drainage hub, the impact force of the water flow makes the movable baffle fit more tightly against the extension, enhancing the blocking effect of sewage and odor gases and preventing gas from leaking from the gap between the movable baffle and the discharge pipe.

[0026] Furthermore, the movable baffle is provided with a counterweight on the side away from the extension.

[0027] By adopting the above technical solution, the counterweight increases the weight of the movable baffle away from the hinge end, allowing it to quickly and stably return to the closed position under gravity after drainage. This ensures effective blocking of odor gases, improves the reliability of the anti-backflow structure, and reduces the possibility of odor backflow due to the movable baffle's failure to reset in time. During drainage, the impact force of the water flow may cause the movable baffle to swing to varying degrees. The counterweight increases the stability of the movable baffle, ensuring it remains relatively stable when facing water flows of different flow rates and velocities. It prevents excessive opening or shaking due to water flow impact, thus better adapting to the complex and changing water flow conditions within the discharge pipe and ensuring effective blocking of odor gases under various drainage conditions.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. Multiple indoor drainage branch pipes are arranged circumferentially on the indoor drainage hub to optimize the drainage layout, make full use of space, reduce water flow impact, enhance system stability, improve drainage efficiency, and facilitate unblocking. A first anti-backflow gas and water component is installed near the indoor drainage hub on the discharge pipe, and a second anti-backflow gas and water component is installed inside the indoor drainage hub. This can effectively prevent the backflow of malodorous gases such as hydrogen sulfide and methane, and avoid indoor pollution by odors and harmful gases, in the face of complex working conditions at the core node where multiple branches intersect.

[0030] 2. The first anti-backflow and anti-water-backflow component and the second anti-backflow and anti-water-backflow component are detachably connected. The movable baffle of the first anti-backflow and anti-water-backflow component can automatically adjust the angle according to the size and direction of the water flow. With the extension and counterweight, it can adapt to the complex and ever-changing water flow and pressure conditions in the discharge pipe and ensure stable operation. The second anti-backflow and anti-water-backflow component has a stable structure and the cap can be opened during drainage and reset after drainage.

[0031] 3. The indoor drainage hub is equipped with an inspection port and a sealing component at the top. The inspection port makes it convenient for maintenance personnel to check the internal condition of the pipes. The detachable component allows for inspection, repair or replacement without large-scale disassembly of the pipeline system in case of equipment failure or component aging, reducing maintenance costs and difficulty. The sealing component can prevent debris from falling into the inspection port and protect the internal components. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of a household drainage hub according to an embodiment of this application.

[0033] Figure 2 This is a cross-sectional view of a household drainage hub according to an embodiment of this application. Figure 1 .

[0034] Figure 3 This is a side view of a household drainage hub according to an embodiment of this application.

[0035] Figure 4 This is a cross-sectional structural diagram of the discharge pipe and the anti-backflow gas and water component according to an embodiment of this application.

[0036] Figure 5 This is a cross-sectional view of a household drainage hub according to an embodiment of this application. Figure 2 .

[0037] Figure 6 This is a cross-sectional structural diagram of the second anti-backflow and anti-water component in the embodiments of this application.

[0038] Figure 7 This is a cross-sectional structural diagram of the sealing component according to an embodiment of this application.

[0039] Explanation of reference numerals in the attached drawings: 1. Indoor drainage hub; 11. Inspection port; 2. Indoor drainage branch pipe; 3. Discharge pipe; 4. First anti-backflow and anti-water-return assembly; 41. Opening and closing structure; 411. Fixed baffle; 412. Movable baffle; 4121. Movable shaft; 4122. Counterweight; 413. Hinge seat; 4131. Rotating groove; 42. Mounting collar; 421. Extension; 5. Sealing assembly; 51. Second anti-backflow and anti-water-return assembly; 511. Inner shell; 512. Reset connecting rod; 513. Sealing cap; 52. Cover assembly; 521. Cover top plate; 5211. Drain hole; 522. Mounting frame; 6. Water-blocking sleeve; 61. Snap-fit ​​ring; 62. Threaded sleeve. Detailed Implementation

[0040] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figure 1-7 The present application will be further described in detail with reference to the embodiments.

[0041] This application discloses a household drainage hub. (Refer to...) Figure 1 and Figure 2 The backflow prevention structure of the household drain pipe 3 includes an indoor drainage hub 1, an indoor drainage branch pipe 2, a drain pipe 3, a first backflow prevention component 4, and a sealing component 5. The drain pipe 3 is used to connect to the building's drainage riser, the indoor drainage hub 1 is used to connect to the drain pipe 3, and the indoor drainage branch pipe 2 is used to connect to the indoor drainage hub 1.

[0042] In this embodiment, the number of indoor drainage branch pipes 2 is preferably three, with each indoor drainage branch pipe 2 arranged circumferentially and vertically connected to the indoor drainage hub 1. The more rational distribution of the indoor drainage branch pipes 2 along drainage paths in various areas such as the kitchen, bathroom, laundry room, and balcony avoids mutual interference between the indoor drainage branch pipes 2, ensuring that drainage from each area flows smoothly into the indoor drainage hub 1. This achieves the connection of multiple indoor drainage branch pipes 2, forming a relatively stable drainage network structure.

[0043] The bottom of the indoor drainage branch pipe 2 is higher than the bottom of the discharge pipe 3, creating a height difference H1. The water flow generates water pressure through this height difference H1, forcing the first anti-backflow component 4 to open. When one or more indoor drainage branch pipes 2 are draining water, the height of the indoor drainage branch pipe 2 being higher than the bottom of the discharge pipe 3 ensures that the water in the draining indoor drainage branch pipe 2 will preferentially be discharged through the discharge pipe 3, reducing the likelihood of sewage flowing into adjacent indoor drainage branch pipes 2. Simultaneously, the sewage opens the anti-backflow component due to water pressure, and the height difference H1 ensures that the sewage in the indoor drainage hub 1 opens the first anti-backflow component 4 before reaching the bottom of the indoor drainage branch pipe 2, preventing excessive water accumulation from flowing into other indoor drainage branch pipes 2.

[0044] Reference Figure 2 and Figure 3 The first anti-backflow and anti-water-return component 4 is detachably connected to the inside of the discharge pipe 3 near the location connected to the indoor drainage hub 1, which has an inspection port 11. The inspection port 11 facilitates the installation and removal of the first anti-backflow and anti-water-return component 4, and also provides maintenance personnel with a passage to inspect and maintain the inside of the pipe. Maintenance personnel can observe the internal condition of the pipe through the inspection port 11 and promptly identify any problems.

[0045] Reference Figure 3 and Figure 4 The first anti-backflow and anti-water-return component 4 includes an opening and closing structure 41 and an installation collar 42. The installation collar 42 is inserted into the discharge pipe 3 so that the opening and closing structure 41 can be installed. The outer wall of the installation collar 42 abuts against the inner wall of the drain pipe to achieve a snap-fit. When it is necessary to disassemble the first anti-backflow and anti-water-return component 4, the installation collar 42 can be pulled out.

[0046] The opening and closing structure 41 includes a fixed baffle 411 and a movable baffle 412. The fixed baffle 411 is integrally connected to the mounting collar 42. The fixed baffle 411 surrounds the outside of the movable baffle 412 and has an opening that matches the movable baffle 412 and allows water to flow through. A hinge seat 413 is integrally connected to the inner wall of the fixed baffle 411 near the top side of the discharge pipe 3. A movable shaft 4121 that mates with the hinge seat 413 is integrally connected to the side edge of the movable baffle 412. The hinge seat 413 has a rotating groove 4131 on its upper side for the movable shaft 4121 to be inserted and rotated, so that the movable baffle 412 can both rotate on the mounting sleeve and be detachable.

[0047] The movable baffle 412 is inclined outward from the side connected to the hinge seat 413 to the side away from the indoor drainage hub 1. The mounting collar 42 has an extension 421 near the bottom of the discharge pipe 3 to abut against the movable baffle 412. The inclined setting can make reasonable use of the impact force of water flow. When sewage flows from the indoor drainage hub 1 to the discharge pipe 3, the inclined baffle is easily opened, ensuring smooth drainage. When sewage tends to flow from the discharge pipe 3 to the indoor drainage hub 1, the impact force of the water flow makes the movable baffle 412 fit more tightly against the extension 421, enhancing the blocking effect of sewage and odor gases. After drainage is completed, the movable baffle 412, under its own weight and the possible residual pressure of the water flow, can more easily return to the closed position by relying on the inclined angle and the support of the extension 421, realizing automatic reset, and can fit tightly with the extension 421 to form a good seal.

[0048] A counterweight 4122 is fixedly connected to the movable baffle 412 on the side away from the extension 421, thereby increasing the weight of the movable baffle 412 away from the hinge end. After drainage is completed, the movable baffle 412 can quickly and stably return to the closed position under the action of gravity, ensuring effective blocking of odor gases, improving the reliability of the anti-backflow structure, and reducing the possibility of odor backflow caused by the movable baffle 412 failing to reset in time.

[0049] Reference Figure 5 and Figure 6The indoor drainage hub 1 is detachably installed with a water-blocking sleeve 6 inside the inspection port 11. The indoor drainage hub 1 is fixed with a snap-fit ​​ring 61 at the top position. The snap-fit ​​ring 61 is fixed with a threaded sleeve 62 for threaded connection of the water-blocking sleeve 6 on the inner wall. The water-blocking sleeve 6 is detachably connected to the indoor drainage hub 1 through the snap-fit ​​ring 61 and the threaded sleeve 62.

[0050] The bottom height of the water-blocking sleeve 6 is lower than the bottom height of the indoor drainage branch pipe 2, thus forming a height difference H2. When sewage is discharged from the indoor drainage branch pipe 2, it is blocked by the water-blocking sleeve 6, impacts the water-blocking sleeve 6 first, and then falls into the bottom of the drainage hub. It will not directly rush into other pipes, and also avoids the water flow being too rapid, reducing the impact on the first anti-backflow and anti-airflow component 4 installed on the discharge pipe 3.

[0051] The sealing assembly 5 includes a second anti-backflow and anti-water component 51 and a cover assembly 52. ​​The second anti-backflow and anti-water component 51 is located inside the inspection port 11 of the indoor drainage hub 1 and is detachably connected to the water-blocking sleeve 6. The cover assembly 52 is installed above the second anti-backflow and anti-water component 51 and is used to cover the inspection port 11.

[0052] The second anti-backflow and anti-water component 51 includes an inner housing 511, a reset connecting rod 512, and a cap 513. The inner housing 511 is coaxially arranged and extends into the water-blocking sleeve 6, and the inner housing 511 is threadedly connected to the inner wall of the water-blocking sleeve 6. The reset connecting rod 512 is installed at the central axis position of the inner housing 511, and the cap 513 is fixedly connected to the lower end of the reset connecting rod 512. When draining, the pressure of the water flow will cause the cap 513 to open, allowing water to pass smoothly. After draining, under the action of the reset connecting rod 512, the cap 513 can quickly reset, tightly sealing the drain outlet and preventing gas in the sewer from returning to the room through the pipe, thereby avoiding indoor pollution by odors and harmful gases.

[0053] Combination Figure 7 The cover assembly 52 is located at the top of the indoor drainage hub 1 and is used to cover the access port 11. The cover assembly 52 includes a cover top plate 521 and a mounting frame 522. The mounting frame 522 is installed on the ground and located above the second anti-backflow and anti-water component 51. The cover top plate 521 is snapped onto the mounting frame 522. Figure 1 The top plate 521 has a drain hole 5211 on the top side, which is aligned with the inspection port 11 and connected to the inspection port 11.

[0054] The cover assembly 52 prevents debris and garbage from falling into the inspection port 11, avoiding blockage of the pipes or damage to the second anti-backflow and anti-water component 51. The cover top plate 521 cooperates with the mounting frame 522 to form a closed structure, protecting the inspection port 11 and the internal second anti-backflow and anti-water component 51. The cover assembly 52 is installed on the ground, and the cover top plate 521 is flush with or coordinated with the surrounding ground.

[0055] The implementation principle of a household drainage hub according to an embodiment of this application is as follows: The household drainage hub 1 is circumferentially connected to three household drainage branch pipes 2 (such as kitchen, master bathroom, guest bathroom, etc.), and the bottom of the branch pipes is higher than the bottom of the discharge pipe 3, forming a height difference H1. During drainage, the water flow in the branch pipes generates water pressure due to the height difference, forcing the first anti-backflow and anti-reverse flow component 4 in the discharge pipe 3 to open, and sewage preferentially flows through the discharge pipe 3 to the building riser. Since the bottom of the branch pipes is higher than the water level in the hub, sewage can be prevented from entering adjacent branch pipes before discharge, ensuring independent and smooth drainage in each area.

[0056] The component is snapped onto the discharge pipe 3 near the hub via a mounting collar 42. Its opening and closing structure 41 includes a fixed baffle 411 and a movable baffle 412. The movable baffle 412 is connected to the mounting collar 42 via a hinge seat 413 and is inclined toward the outlet of the discharge pipe 3. The bottom extension 421 is used to support the baffle closure. During drainage, the impact force of the water flow opens the inclined movable baffle 412, and the sewage is discharged smoothly. After drainage, the movable baffle 412 automatically resets due to its own weight (in conjunction with the counterweight 4122) and residual pressure, forming a seal tightly against the extension 421 to prevent odors or backflow from the riser from entering the house. The detachable mounting collar 42 is designed to facilitate component maintenance through the inspection port 11 at the top of the hub.

[0057] A water-blocking sleeve 6 is installed inside the inspection port 11 at the top of the indoor drainage hub 1, with its bottom height lower than the bottom of the branch pipe (height difference H2). When sewage is discharged, it first impacts the water-blocking sleeve 6 to buffer the impact, reducing the direct impact on the first component and lowering water flow noise. The second anti-backflow and anti-reverse airflow component 51 (inner shell 511, reset connecting rod 512, and cap 513) inside the inspection port 11 is connected to the water-blocking sleeve 6 by threads. When draining, the water flow pressure pushes open the cap 513, and after draining, the reset connecting rod 512 drives the cap 513 to close, forming a second anti-backflow barrier.

[0058] The cover assembly 52 (cover top plate 521, mounting frame 522) covers the access port 11, with the drain hole 5211 of the top plate aligned with the hub, allowing ground drainage to flow in while preventing debris from falling into the pipe. The mounting frame 522 is fixed to the ground, making the cover top plate 521 flush with the ground, providing both protection and aesthetics. The overall structure uses multiple detachable connections (threaded, snap-fit, etc.) to facilitate quick maintenance of internal components by maintenance personnel through the access port 11, improving system reliability and ease of use.

[0059] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A household drainage hub, characterized in that: It includes a discharge pipe (3) for connecting to the building drainage riser, an indoor drainage hub (1) for connecting to the discharge pipe (3), and at least one indoor drainage branch pipe (2) connected to the indoor drainage hub (1). The discharge pipe (3) has a first anti-backflow and anti-water component (4) located near the connection of the indoor drainage hub (1).

2. A household drainage hub according to claim 1, characterized in that: The first anti-backflow and anti-water component (4) is detachably connected to the discharge pipe (3). The indoor drainage hub (1) is provided with an inspection port (11). The indoor drainage hub (1) is provided with a sealing component (5) at the top for sealing the inspection port (11).

3. A household drainage hub according to claim 1, characterized in that: The bottom height of the indoor drainage branch pipe (2) is higher than the bottom height of the discharge pipe (3), thus forming a height difference H1. The water flow generates water pressure through the height difference H1, thereby forcing the first anti-backflow and anti-water component (4) to open.

4. A household drainage hub according to claim 2, characterized in that: The indoor drainage hub (1) is detachably installed with a water-blocking sleeve (6) inside the inspection port (11). The bottom height of the water-blocking sleeve (6) is lower than the bottom height of the indoor drainage branch pipe (2), thus forming a height difference H2.

5. A household drainage hub according to claim 2, characterized in that: The sealing assembly (5) includes a second anti-backflow and anti-water component (51) and a cover assembly (52). The second anti-backflow and anti-water component (51) is located inside the inspection port (11) and is detachably connected to the indoor drainage hub (1). The cover assembly (52) includes a cover top plate (521) and an installation frame (522) for placing the cover top plate (521). The cover top plate (521) has a drain hole (5211).

6. A household drainage hub according to claim 5, characterized in that: The second anti-backflow and anti-water component (51) includes an inner shell (511), a reset connecting rod (512), and a cap (513). The inner shell (511) is detachably connected to the indoor drainage hub (1) and extends into the inspection port (11). The reset connecting rod (512) is installed at the central axis position of the inner shell (511), and the cap (513) is fixedly connected to the lower end of the reset connecting rod (512).

7. A household drainage hub according to claim 2, characterized in that: The first anti-backflow and anti-water-backflow component (4) includes an opening and closing structure (41) and an installation collar (42) for installing the opening and closing structure (41), the installation collar (42) being engaged with the inner wall of the discharge pipe (3).

8. A household drainage hub according to claim 7, characterized in that: The opening and closing structure (41) includes a fixed baffle (411) integrally connected with the mounting collar (42) and a movable baffle (412) for blocking water. The fixed baffle (411) has an opening that matches the movable baffle (412) and allows water to flow through. The fixed baffle (411) is provided with a hinge seat (413) for mounting the movable baffle (412) at a position near the top inner wall of the discharge pipe (3). The movable baffle (412) is provided with a movable shaft (4121) on its side edge. The hinge seat (413) is provided with a rotating groove (4131) for the movable shaft (4121) to be engaged and rotated.

9. A household drainage hub according to claim 8, characterized in that: The movable baffle (412) is inclined outward from the side connected to the hinge seat (413) to the side away from the indoor drainage hub (1), and the fixed baffle (411) is provided with an extension (421) for abutting against the movable baffle (412) at a position near the bottom of the discharge pipe (3).

10. A household drainage hub according to claim 9, characterized in that: The movable baffle (412) has a counterweight (4122) on the side away from the extension (421).

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