Hydraulic self-locking anti-backflow floor drain
By combining a hydraulically self-locking ball and a water seal overflow component, the problem of backflow in the drainage system is solved, a stable water seal and automatic adjustment of the seal are achieved, and the anti-overflow performance of the floor drain is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWER CHINA KUNMING ENG CORP LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-06-26
Smart Images
Figure CN224412760U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of floor drains, and in particular to a hydraulically self-locking anti-backflow floor drain. Background Technology
[0002] Floor drains are crucial interfaces connecting drainage pipes to the indoor floor in buildings, primarily used in bathrooms, shower rooms, balconies, corridors, and other areas requiring drainage. Conventional floor drains generally possess basic drainage and odor-proof functions (usually using water seals or mechanical seals). However, in situations such as downstream blockages in the drainage pipes, excessively high water levels in the municipal drainage network (e.g., during heavy rain), or poor drainage from the main building's pipes, the pressure of rainwater and sewage within the pipes increases, easily causing backflow through the floor drain to the indoor floor, resulting in serious pollution. Furthermore, the water seal in many ordinary floor drains is compromised by pressure fluctuations within the drainage system, and the water seal evaporates due to prolonged periods without drainage, leading to insufficient water seal height to meet regulatory requirements, ultimately resulting in a poor indoor sanitary environment.
[0003] Mechanical valve and bell-shaped floor drains have poor reliability. Other mechanical floor drains rely on mechanical seals, which are prone to jamming and failure when there are many impurities in the water. The airflow fluctuations in the drainage system can cause the water seal of the floor drain to be damaged due to the influence of water flow at each drainage point. In drainage points that have not been drained for a long time (such as equipment rooms where drainage is used), the water in the water seal will evaporate, causing the water seal to fail. In places such as balconies and corridors where a small amount of rainwater needs to be drained from the ground, anti-backflow floor drains are usually connected to the rainwater downpipe on the exterior wall. When the water pressure in the outdoor rainwater downpipe is high (below 1 / 2 of the downpipe), the anti-backflow floor drain is not effective in preventing backflow, resulting in rainwater backflow. Utility Model Content
[0004] The purpose of this utility model is to address the shortcomings of existing technologies by providing a hydraulically self-locking anti-backflow floor drain. It uses a hydraulically self-locking ball combined with a water seal overflow component, based on the principle of buoyancy, to achieve a hydraulic seal. It eliminates the need for complex hinges, springs, and other mechanical structures, thereby increasing the reliability of the floor drain.
[0005] To achieve the above objectives, the following technical solution is adopted:
[0006] A hydraulically self-locking anti-backflow floor drain, comprising:
[0007] The drain body has a cylindrical structure with radially distributed base plates installed inside. Drain holes are opened on the base plates. A water seal overflow component is provided between the base plates and one end opening of the drain body. The water seal overflow component is cylindrical, with one end connected to the base plate for sealing and the other end forming an overflow port. An overflow cavity is formed inside.
[0008] The anti-backflow component includes an anti-backflow cylinder and a hydraulically self-locking ball. The anti-backflow cylinder is arranged inside the drain body. One end of the anti-backflow cylinder extends to and overlaps with the opening at one end of the drain body. The other end extends into the overflow chamber as an anti-backflow port. The hydraulically self-locking ball is floating between the anti-backflow port and the bottom plate. The hydraulically self-locking ball can move under the action of water flow above the anti-backflow port to open the anti-backflow port, and can also move under the action of water flow below the anti-backflow port to block the anti-backflow port.
[0009] Furthermore, the top opening edge of the drain body extends radially to form an upper receiving port, and the bottom opening forms a lower receiving port extending to the outside of the base plate. One end of the anti-backflow cylinder overlaps the upper receiving port, and a socket rubber ring is installed in the lower receiving port to connect with the drainage branch pipe.
[0010] Furthermore, a fixing ring is connected to one end of the anti-backflow cylinder and the upper bearing port, and the fixing ring cooperates with the upper bearing port to constrain the position of the anti-backflow cylinder.
[0011] Furthermore, the upper support is fitted with a fixing plate, and a grille component that blocks the opening at one end of the drain body is installed on the fixing plate.
[0012] Furthermore, the grid component includes coarse grids and fine grids spaced apart, with the fine grids located below the coarse grids, and the mesh size of the coarse grids being larger than that of the fine grids.
[0013] Furthermore, a radial gap is left between the inner wall of the drain body and the water seal overflow component, and a radial gap is left between the water seal overflow component and the anti-backflow cylinder. The water in the anti-backflow cylinder flows through the overflow port, bypasses the top overflow port of the water seal overflow component, and falls into the drain hole.
[0014] Furthermore, the water seal overflow component has a multi-segment cylindrical structure with gradually changing diameter along the axial direction, and the diameter of the sealing end of the water seal overflow component is smaller than the diameter of the overflow port.
[0015] Furthermore, the anti-backflow port is equipped with a rubber gasket to form a seal by adhering to the hydraulically self-locking ball.
[0016] Furthermore, the base plate is provided with multiple drainage holes.
[0017] Furthermore, a waterproof wing ring extends radially along the outer circumferential wall of the drain body.
[0018] Compared with the prior art, the beneficial effects of this utility model are:
[0019] The system uses a hydraulically self-locking ball instead of a mechanical seal, utilizing buoyancy and water flow to achieve sealing and opening, eliminating hinges, springs, and other easily jammed mechanical parts. When drainage is needed, water enters through the drain body opening, flows through the anti-backflow cylinder to the anti-backflow outlet, and the impact force of the water flow pushes the hydraulically self-locking ball away from the anti-backflow outlet, allowing drainage to pass over the overflow outlet. After drainage, the ball returns to its original position under the action of buoyancy, requiring no mechanical drive.
[0020] The overflow chamber of the water seal overflow component stores a certain amount of water to form a water seal. The overflow port controls the water seal height. At the same time, the enclosed space of the overflow chamber reduces water evaporation and isolates it from areas of airflow fluctuation. Under normal conditions, the water stored in the overflow chamber forms a stable water seal, isolating airflow in the drainage system. Even if there is no drainage for a long time, the hydraulically self-locking ball seals the overflow port to form a closed structure, which slows down water evaporation, and the water seal height is limited by the overflow port to prevent excessive loss. If too much water enters, the excess water is discharged from the overflow port, maintaining the basic water seal height. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of a hydraulically self-locking anti-backflow floor drain in an embodiment of this utility model.
[0022] Figure 2 This is a schematic diagram of the water seal state of the hydraulically self-locking anti-backflow floor drain in an embodiment of this utility model.
[0023] Figure 3 This is a schematic diagram of the drainage state of the hydraulically self-locking anti-backflow floor drain in an embodiment of this utility model.
[0024] Figure 4 This is a schematic diagram of the anti-backflow state of the hydraulically self-locking anti-backflow floor drain in an embodiment of this utility model.
[0025] Numbering Explanation (in order of first appearance): 100, Drain body; 200, Anti-backflow component; 300, Grille component; 101, Upper socket; 102, Lower socket; 103, Socket rubber ring; 104, Base plate; 105, Drain hole; 106, Water seal overflow component; 107, Waterproof wing ring; 201, Hydraulic self-locking ball; 202, Fixing ring; 203, Fixing disc; 204, Rubber gasket; 301, Coarse grille; 302, Fine grille. Detailed Implementation
[0026] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.
[0027] In this embodiment, as Figures 1-4 As shown, the structure of the hydraulic self-locking anti-backflow floor drain adopts the core concept of hydraulic self-locking and water seal overflow. The overall structure is divided into two main components: the floor drain body 100 and the anti-backflow component 200.
[0028] The drain body 100 has a cylindrical structure, with radially distributed base plates 104 installed inside. The base plates 104 divide the interior of the drain body 100. Drain holes 105 are provided on the base plates 104. A water seal overflow component 106 is provided between the base plates 104 and one end opening of the drain body 100. The water seal overflow component 106 is cylindrical, with one end connected to and sealed by the base plates 104, and the other end forming an overflow port. An overflow chamber is formed inside. The drain holes 105 on the base plates 104 are used to drain water entering the drain. The core function of the water seal overflow component 106 is to store a certain amount of water to form a stable water seal, and simultaneously maintain the water seal height through the overflow structure to prevent water seal failure caused by evaporation or airflow fluctuations.
[0029] The anti-backflow component 200 includes an anti-backflow cylinder and a hydraulically self-locking ball 201. The anti-backflow cylinder is arranged inside the drain body 100, with one end opening extending to and overlapping with one end opening of the drain body 100, and the other end opening serving as an anti-backflow port protruding into the overflow chamber. The hydraulically self-locking ball 201 is floating between the anti-backflow port and the base plate 104. The hydraulically self-locking ball 201 can move under the action of water flow above the anti-backflow port to open it, and can also move under the action of water flow below it to block it. The hydraulically self-locking ball 201 floats between the anti-backflow port and the base plate 104 without any mechanical connection structure, and its movement is achieved solely by buoyancy and water flow force.
[0030] The overflow chamber of the water seal overflow component 106 stores a certain amount of water to form a water seal. The overflow port controls the water seal height. At the same time, the enclosed space of the overflow chamber reduces water evaporation and isolates it from areas of airflow fluctuation. Under normal conditions, the water stored in the overflow chamber forms a stable water seal, isolating the airflow in the drainage system. Even if there is no drainage for a long time, the enclosed structure of the overflow chamber slows down water evaporation, and the water seal height is limited by the overflow port to prevent excessive loss. If too much water enters, the excess water is discharged from the overflow port, maintaining the basic water seal height.
[0031] Utilizing the reverse sealing characteristic of the hydraulically self-locking ball 201, when the water pressure below increases, the ball is pushed towards the anti-backflow outlet under buoyancy, thereby cutting off the connection between the overflow chamber and the anti-backflow cylinder and achieving automatic sealing. When the water pressure in the outdoor downpipe is high, and the water flow impacts in the reverse direction from below the anti-backflow outlet, the hydraulically self-locking ball 201 moves upward under the water pressure, tightly sealing the anti-backflow outlet and preventing rainwater from overflowing; after the water pressure in the downpipe decreases, the ball resets under buoyancy, without affecting normal drainage.
[0032] like Figure 1As shown, the drain body 100 is cylindrical, with both the upper and lower parts having socket structures. One end of the anti-backflow cylinder overlaps with the upper socket 101, and a socket rubber ring 103 is installed in the lower socket 102 to connect with the drainage branch pipe. The upper socket 101 is formed by the radially extending edge of the top opening of the drain body 100, and the lower socket 102 is formed by the bottom opening extending beyond the base plate 104. The upper socket 101 of the drain body 100 is used to install the anti-backflow component 200 and to receive and install the grille component 300. The lower socket 102 of the drain body 100 is used to receive and install the drainage branch pipe, and the inner wall of the lower socket is lined with socket rubber to facilitate the insertion and insertion of the pipe.
[0033] The water seal overflow component 106 has a multi-segment cylindrical structure with gradually changing diameters along the axial direction. The diameter of the sealing end of the water seal overflow component 106 is smaller than the diameter of the overflow port. In this embodiment, one end of the water seal overflow component 106 is connected to the center of the base plate 104. After the bottom end of the water seal overflow component 106 is sealed, it forms a cup-shaped structure with an upper opening. The base plate 104 has multiple drainage holes 105 distributed circumferentially around the water seal overflow component 106.
[0034] The anti-backflow component 200 includes an anti-backflow cylinder and a hydraulically self-locking ball 201. The hydraulically self-locking ball 201 is a hollow plastic ball with a smooth surface, and the diameter of the ball is smaller than the cavity at the bottom of the water seal overflow component 106, so that the ball can quickly enter the bottom of the cavity of the water seal overflow component 106 during the drainage process, thereby opening the anti-backflow port.
[0035] The anti-backflow component 200 has a cup-shaped anti-backflow cylinder with openings at the top and bottom. The anti-backflow cylinder is located inside the water seal overflow component 106, which extends into the cup-shaped upper opening, ensuring a certain gap between the anti-backflow component 200 and the water seal overflow component 106. Specifically, there is a radial gap between the inner wall of the drain body 100 and the water seal overflow component 106, and a radial gap between the water seal overflow component 106 and the anti-backflow cylinder. The water in the anti-backflow cylinder flows through the overflow port, bypasses the top overflow port of the water seal overflow component 106, and falls into the drain hole 105.
[0036] The lower opening of the anti-backflow component 200 is an anti-backflow port, the diameter of which is smaller than the diameter of the hydraulically self-locking ball 201. When there is no drainage, the ball floats to the lower anti-backflow port of the anti-backflow component 200 and tightly engages with the anti-backflow component 200 to prevent water backflow. A rubber gasket 204 is provided on the outer edge of the lower anti-backflow port of the anti-backflow component 200 to achieve a sealing effect.
[0037] The upper opening of the anti-backflow component 200 is turned outward to form a fixing flange for the anti-backflow component 200. The fixing flange is connected to the drain body 100 by a fixing ring 202. The anti-backflow component 200 is fixed to the water seal overflow component 106 by a threaded connection through a fixing plate 203.
[0038] The upper receiving port 101 is fitted with a fixing plate 203, on which a grille component 300 is installed, covering the opening at one end of the drain body 100. The grille component 300 is mainly used to prevent debris and hair in the drainage from entering the drain, causing blockage and backflow prevention failure. The grille component 300 includes coarse grilles 301 and fine grilles 302 spaced apart. The fine grilles 302 are located below the coarse grilles 301. The mesh size of the coarse grilles 301 is larger than that of the fine grilles 302. The grille fixing plate 203 has two levels of internal grooves. The radially inner level internal groove is used to place the fine grilles 302, and the radially outer level internal groove is used to place the coarse grilles 301. The coarse grilles 301 and fine grilles 302 are grates, using a two-stage grate interception method. The first level of the grille is the coarse grille 301, installed on the outermost side of the drain to intercept larger debris. The secondary grille is a fine grille 302, installed between the main grille and the anti-backflow component 200, used to intercept small debris and hair.
[0039] The hydraulically self-locking anti-backflow floor drain of this utility model has a detachable structure. The anti-backflow component 200 and the grille component 300 are installed sequentially inside the floor drain body 100 and form a whole.
[0040] The drain outlet connects the floor drain and the drainage branch pipe. During drainage, it releases water from the floor drain body 100 into the drainage pipe. During backflow prevention, it dissipates energy from the water in the drainage pipe and controls the flow rate of water flowing back into the floor drain. The water seal overflow component 106 is fixed to the base plate 104. To meet the requirements of the floor drain water seal height, the height of the water seal overflow component 106 relative to the base plate 104 is not less than 50mm, with a typical height of 80mm.
[0041] A waterproof wing ring 107 extends radially along the outer circumferential wall of the drain body 100. The waterproof wing ring 107 is located at 1 / 2 height of the outer wall of the drain body 100, mainly for waterproofing and also for fixing the drain.
[0042] like Figure 2 As shown, when there is drainage entering the floor drain, if the water level in the anti-backflow component 200 is higher than the water level in the water seal overflow component 106, the pressure at the bottom of the hydraulic self-locking ball 201 is less than the pressure at the top, which forces the buoyancy of the hydraulic self-locking ball 201 to decrease and begin to sink, and the bottom of the anti-backflow component 200 opens.
[0043] The drainage flows through the anti-backflow component 200 and into the water seal overflow component 106. It overflows into the cavity of the floor drain body 100 and flows into the drainage branch pipe through the drain outlet, thus completing the drainage process.
[0044] like Figure 3 As shown, under the condition that no water flows into the floor drain, the water seal overflow component 106 stores the water that did not overflow during the previous drainage to form a water seal.
[0045] As the moisture inside the anti-backflow component 200 evaporates and decreases, the pressure at the bottom of the hydraulic self-locking ball 201 becomes greater than the pressure at the top, forcing the hydraulic self-locking ball 201 to float to the bottom of the anti-backflow component 200 and fit tightly against the rubber gasket 204.
[0046] like Figure 4 As shown, under the anti-backflow condition, a large amount of drainage flows from the drain pipe through the drain outlet to dissipate energy and into the cavity of the drain body 100, filling the cavity between the drain body 100 and the anti-backflow component 200.
[0047] Under this condition, the pressure at the bottom of the hydraulic self-locking ball 201 is much greater than the pressure at the top, the buoyancy of the hydraulic self-locking ball 201 increases, the sealing of the floor drain increases, thereby preventing water from overflowing from the drainage pipe.
[0048] The specific embodiments of the utility model have been described in detail above, but they are only examples, and the utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the utility model are also within the scope of the utility model. Therefore, all equivalent transformations, modifications, and improvements made without departing from the spirit and principles of the utility model should be covered within the scope of the utility model.
Claims
1. A hydraulically self-locking anti-backflow floor drain, characterized in that, include: The drain body has a cylindrical structure with radially distributed base plates installed inside. Drain holes are opened on the base plates. A water seal overflow component is provided between the base plates and one end opening of the drain body. The water seal overflow component is cylindrical, with one end connected to the base plate for sealing and the other end forming an overflow port. An overflow cavity is formed inside. The anti-backflow component includes an anti-backflow cylinder and a hydraulically self-locking ball. The anti-backflow cylinder is arranged inside the drain body. One end of the anti-backflow cylinder extends to and overlaps with the opening at one end of the drain body. The other end extends into the overflow chamber as an anti-backflow port. The hydraulically self-locking ball is floating between the anti-backflow port and the bottom plate. The hydraulically self-locking ball can move under the action of water flow above the anti-backflow port to open the anti-backflow port, and can also move under the action of water flow below the anti-backflow port to block the anti-backflow port.
2. The hydraulically self-locking anti-backflow floor drain as described in claim 1, characterized in that, The top opening edge of the drain body extends radially to form an upper receiving port, and the bottom opening forms a lower receiving port extending to the outside of the base plate. One end of the anti-backflow cylinder overlaps the upper receiving port, and a socket rubber ring is installed in the lower receiving port to connect with the drainage branch pipe.
3. The hydraulically self-locking anti-backflow floor drain as described in claim 2, characterized in that, The anti-backflow cylinder is connected to a fixing ring at one end of its overlap with the upper bearing. The fixing ring cooperates with the upper bearing to constrain the position of the anti-backflow cylinder.
4. The hydraulically self-locking anti-backflow floor drain as described in claim 2 or 3, characterized in that, The upper receiving port is fitted with a fixing plate, and a grille component that covers the opening at one end of the drain body is installed on the fixing plate.
5. The hydraulically self-locking anti-backflow floor drain as described in claim 4, characterized in that, The grid component includes coarse grids and fine grids spaced apart, with the fine grids located below the coarse grids. The mesh size of the coarse grids is larger than that of the fine grids.
6. The hydraulically self-locking anti-backflow floor drain as described in claim 1, characterized in that, The inner wall of the drain body has a radial gap with the water seal overflow component, and the water seal overflow component has a radial gap with the anti-backflow cylinder. The water in the anti-backflow cylinder flows through the overflow port, bypasses the top overflow port of the water seal overflow component, and falls to the drain hole.
7. The hydraulically self-locking anti-backflow floor drain as described in claim 1 or 6, characterized in that, The water seal overflow component is a multi-segment cylindrical structure with gradually changing diameter along the axial direction, and the diameter of the sealing end of the water seal overflow component is smaller than the diameter of the overflow port.
8. The hydraulically self-locking anti-backflow floor drain as described in claim 7, characterized in that, The anti-overflow port is equipped with a rubber gasket to form a seal by adhering to the hydraulically self-locking ball.
9. The hydraulically self-locking anti-backflow floor drain as described in claim 1, characterized in that, The base plate has multiple drainage holes.
10. The hydraulically self-locking anti-backflow floor drain as described in claim 1 or 9, characterized in that, A waterproof wing ring extends radially along the outer circumferential wall of the drain body.