A floor drain with both ends sealed for long-term water filling

Abstract

This invention discloses a floor drain with sealed ends for long-term full water operation, comprising a U-shaped water storage pipe, a water inlet sealing port, an upright pot bottom, a water inlet sealing float, a water inlet sealing cylinder, a drain hole, a water inlet filter cover, a drain sealing cover, a drain sealing float, a drain sealing cylinder, a drain interface, a simulated water storage line, an inverted pot bottom, and a drain sealing port. Dynamic sealing pairs consisting of floats and sealing ports are set at both ends of the U-shaped water storage pipe. When there is no water, the pipe relies on its own weight to seal, preventing water seal evaporation. During drainage, the floats rise synchronously, achieving full-diameter drainage. When the main drain pipe is under negative pressure, the water inlet float is pressed tightly to seal; when under positive pressure, the drain float prevents odor backflow, ensuring that the U-shaped water storage pipe is always full of water. This completely solves the problems of poor drainage, water seal evaporation, negative pressure damage, and maintenance-free operation. It is applicable to ordinary floor drains, secondary drainage systems, urinals, washbasins, and other scenarios.

Description

Technical Field

[0001] This invention relates to the field of sanitary equipment technology, and in particular to a floor drain that is sealed at both ends and constantly filled with water. Background Technology

[0002] As a crucial drainage terminal device installed on the floor in wet areas of a home, the core function of a household floor drain is to achieve rapid drainage, long-lasting odor prevention, impurity filtration, and easy maintenance through water or mechanical seals, thereby ensuring a healthy and safe indoor air environment. Medical research shows that when a floor drain seal fails, harmful gases such as hydrogen sulfide, ammonia, and methane from the sewer can enter the room through the leakage channel. This not only irritates the respiratory tract, inducing chronic diseases such as coughs, sore throats, and even asthma, but may also spread pathogenic microorganisms in the form of aerosols, increasing the risk of infection. Long-term exposure to an odorous environment can also cause psychological anxiety and irritability. Therefore, developing a floor drain structure that can truly achieve long-lasting sealing, efficient drainage, and maintenance-free operation has significant social value and practical implications.

[0003] However, most mainstream floor drain products on the market still suffer from several insurmountable technical defects. The vast majority of products use mechanical sealing structures, such as spring return, magnetic closure, or counterweight flaps. These solutions are prone to seal failure in actual use due to spring fatigue, magnetic attenuation, hair and debris blockage, or wear on the sealing surface. Users often cannot detect this in time, leading to persistent odor leakage. Furthermore, mechanical seal structures typically have opening resistance, requiring water to reach a certain depth before drainage is triggered, severely impacting drainage response speed. On the other hand, while traditional water-sealed floor drains offer good initial sealing, their water surface is directly exposed to the air. In typical bathroom environments, a standard 50mm water seal has a complete evaporation cycle of only 15 to 30 days, with an average daily evaporation depth of 1.7 to 3.3mm. Evaporation is even faster in high-temperature or well-ventilated areas, making it easy for unoccupied rooms to lose their odor-preventing function due to the water seal drying out. In addition, due to the objective condition that the inner diameter of the pre-embedded drainage pipes in buildings is generally less than 43 mm, the water outlet channel of existing floor drains is often further narrowed by mechanical structures, resulting in a serious lack of effective flow area. This leads to frequent problems such as the overflow of washing machine water during instantaneous large-flow drainage and the difficulty in draining water from the floor during showers.

[0004] Even more serious is the fact that the main sewage pipes of high-rise buildings experience severe pressure fluctuations when multiple households drain water simultaneously: residents on higher floors are susceptible to negative pressure suction, causing the water seal in the floor drains to be repeatedly sucked away; while lower floors face positive pressure impacts, causing odors to directly break through the water seal and flood into the rooms. Existing floor drains—whether mechanical flap type, bell-type, sleeve type, or traditional U-shaped trap—are all unable to effectively resist such dynamic pressure interference. Bell-type drains have shallow water seals, are prone to evaporation, and have poor resistance to positive pressure; sleeve-type drains have complex structures and are prone to clogging; while traditional U-shaped traps, although providing smooth drainage, also face the dual challenges of water seal evaporation and pressure instability. Furthermore, these structures generally require frequent cleaning and maintenance; hair and sediment easily accumulate in narrow channels or sealing gaps, further exacerbating the risk of blockage and seal failure.

[0005] It is worth noting that urinals, washbasins, and the increasingly popular secondary drainage systems in bathrooms, which share similar drainage characteristics with floor drains, face common challenges such as difficulty in maintaining a long-term water seal, the disruption of the seal by positive and negative pressure in the main sewage pipe, and a lack of reliable odor-proofing measures. In particular, secondary drain outlets, which are directly connected to the building's main sewage pipe, become high-risk channels for the backflow of odors and germs without an effective sealing mechanism. Although the industry has recognized the severity of the problem, no structure has yet been able to simultaneously achieve multiple objectives, including high-flow-rate drainage, permanent water seal maintenance, resistance to pipe pressure fluctuations, and maintenance-free operation. Therefore, an innovative floor drain design is urgently needed to fundamentally solve the systemic deficiencies of existing technologies in terms of sealing reliability, drainage efficiency, environmental adaptability, and application versatility. Summary of the Invention

[0006] The purpose of this invention is to provide a floor drain that is sealed at both ends and constantly filled with water, in order to overcome the shortcomings of the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A floor drain with sealed ends for long-term full-water operation includes a U-shaped water storage pipe, a water inlet sealing port, an upright pot bottom, a water inlet sealing float, a water inlet sealing cylinder, a drain hole, a water inlet filter cover, a drain sealing cover, a drain sealing float, a drain sealing cylinder, a drain interface, an imaginary water storage line, an inverted pot bottom, and a drain sealing port. The U-shaped water storage pipe forms the main drainage channel of the floor drain, with its two ends being the water inlet and drain ends, respectively. The water inlet sealing port is located at the water inlet end of the U-shaped water storage pipe, and the drain sealing port is located at the drain end end of the U-shaped water storage pipe. The water inlet sealing float is installed above the water inlet sealing port and can float up and down within the water inlet sealing cylinder. The drain sealing float is installed above the drain sealing port and can float up and down within the drain sealing cylinder. The water inlet filter cover covers the top of the water inlet sealing cylinder and has multiple drain holes for guiding water flow into it. It intercepts large particles of impurities; the upright pot bottom is connected to the outer edge of the water inlet seal and has an upwardly convex curved structure to guide water flow smoothly into the U-shaped water storage pipe; the inverted pot bottom is connected to the outer edge of the drain seal and has a downwardly concave curved structure to guide water flow smoothly out; the drain interface is set on the side wall or bottom of the drain seal cylinder and is used to connect to the building's main sewage pipe; the assumed water storage line is a theoretical reference line, representing the water level height of the U-shaped water storage pipe when it is stationary without external interference, and its position is determined by the relative height of the water inlet seal and the drain seal.

[0008] Furthermore, a first dynamic sealing pair is formed between the inlet sealing float and the inlet sealing port, and a second dynamic sealing pair is formed between the drain sealing float and the drain sealing port. When no water flows in, the inlet sealing float rests on the inlet sealing port due to its own weight, and the drain sealing float rests on the drain sealing port due to its own weight, thereby completely isolating the water inside the U-shaped water storage pipe from the outside atmosphere and preventing water evaporation. When water flows into the inlet sealing cylinder through the leakage hole on the inlet filter cover, the water accumulates and causes the inlet sealing float to float. At the same time, the water flows into the U-shaped water storage pipe, pushing the internal water level up. The water pressure acts on the bottom of the drain sealing float, causing it to float. The inlet sealing port and the drain sealing port open simultaneously, forming a continuous drainage channel to achieve unobstructed drainage of a large flow rate. After drainage is completed, the water level in the U-shaped water storage pipe drops back to near the assumed water storage line position. The inlet sealing float and the drain sealing float fall back to the inlet sealing port and the drain sealing port respectively under the action of gravity, re-establishing the sealing state.

[0009] Specifically, when the main sewage pipe of the building generates negative pressure, the external atmospheric pressure acts on the top of the inlet sealing float, pressing it tightly against the inlet sealing port to prevent the water in the U-shaped water storage pipe from being sucked out by the negative pressure; when the main sewage pipe of the building generates positive pressure, the positive pressure airflow acts on the bottom of the drain sealing float, pressing it tightly against the drain sealing port to prevent odors from flowing back into the U-shaped water storage pipe through the drain end; thus, under the three working conditions of static sealing, dynamic drainage, and sewage pipe pressure fluctuation, the U-shaped water storage pipe can maintain a full water state, and the water seal function is effective for a long time.

[0010] The density of the inlet and outlet sealing floats is greater than that of air but less than that of water, ensuring that they can seal by their own weight in the absence of water and float with the rise of water level in the presence of water. The sealing surfaces of the inlet and outlet sealing ports are planar, conical, or spherical structures with a surface roughness of no more than Ra 0.8 μm to ensure sealing reliability. The bottom sealing surfaces of the inlet and outlet sealing floats match the geometry of the corresponding sealing ports, forming a line seal or surface seal when they come into contact. The inner diameter of the inlet sealing cylinder is no less than the inner diameter of the inlet end of the U-shaped water storage pipe, and the annular gap area between the outer diameter of the inlet sealing float and the inner wall of the inlet sealing cylinder is no less than 1.2 times the cross-sectional area of ​​the U-shaped water storage pipe to avoid a throttling effect during drainage. Similarly, the annular gap area between the outer diameter of the outlet sealing float and the inner wall of the outlet sealing cylinder is also no less than 1.2 times the cross-sectional area of ​​the U-shaped water storage pipe.

[0011] Furthermore, the radius of curvature of the upright pot bottom is coordinated with the bottom curvature of the water inlet sealing float, allowing the water inlet sealing float to naturally slide into the center of the water inlet sealing port along the curved surface of the upright pot bottom when seated, avoiding tilting and jamming; the radius of curvature of the inverted pot bottom is coordinated with the bottom curvature of the drainage sealing float, allowing the drainage sealing float to naturally slide into the center of the drainage sealing port along the curved surface of the inverted pot bottom when seated; the inner surfaces of both the upright and inverted pot bottoms are smooth curved surfaces, without steps, sharp angles or grooves, to prevent hair, mud and other impurities from being trapped; the drainage holes on the water inlet filter cover are circular, elliptical or polygonal through holes with a diameter ranging from 2 mm to 8 mm, and the total opening area is not less than 60% of the cross-sectional area of ​​the water inlet sealing cylinder, so as to balance the filtration effect and drainage efficiency.

[0012] The U-shaped water storage pipe, inlet sealing cylinder, and outlet sealing cylinder are either integrally formed or assembled in separate parts. When an assembly structure is used, the components are fixed by threaded connections, snap-fit ​​connections, or flange connections, with sealing gaskets at the connections. The inlet and outlet sealing floats are solid or hollow, made of materials including stainless steel, aluminum alloy, copper, high-strength engineering plastics, or silicone, and their surfaces can be covered with an elastic sealing layer to enhance sealing performance. The inlet and outlet sealing ports can be equipped with independent elastic sealing rings, or a hard seal can be achieved directly through metal / plastic sealing surfaces. The outlet sealing cover can be integrally formed with the inlet filter cover through connecting ribs to form a single cover, or it can be set independently with an inspection hole on its top, which is closed by a removable sealing plug, forming a sealed top cover for maintenance.

[0013] Specifically, the outlet direction of the drain interface can be configured as horizontal or vertically downward depending on the installation environment; when configured as horizontal, the axis of the drain interface is coplanar with the axis of the drain end of the U-shaped water storage pipe; when configured as vertically downward, the drain interface is located at the center of the bottom of the drain sealing cylinder; the radius of curvature of the inner wall of the curved section of the U-shaped water storage pipe is not less than 1.5 times its pipe diameter to reduce water flow resistance and prevent impurity deposition; the position setting of the assumed water storage line ensures that the minimum water seal depth in the U-shaped water storage pipe is not less than 50 mm, meeting the requirements of relevant national health standards for water seal height.

[0014] Furthermore, the technical solution of this invention is applicable to ordinary floor drains and secondary drainage floor drains of various sizes and models, and can also be directly applied to the drainage systems of sanitary ware with U-shaped water trap structures such as urinals and washbasins. When applied to secondary drainage scenarios, the invention is embedded in the lowest point of the backfill layer of the bathroom sink, with its inlet end connected to the seepage channel of the backfill layer and its outlet end connected to the main sewage pipe of the building. The sealing mechanism at both ends prevents the odor from the main sewage pipe from backflowing into the room through the secondary drainage outlet. When applied to urinals or washbasins, the inlet end of the U-shaped water pipe is connected to the drain outlet of the sanitary ware, and the outlet end is connected to the main sewage pipe. The double float sealing structure replaces the traditional mechanical seal or open water seal to achieve long-term odor isolation. Compared with the prior art, the beneficial effects of the present invention are as follows: Through the aforementioned specific structural design and working mechanism, this invention ensures that, in the absence of drainage, the water inside the U-shaped water storage pipe is completely sealed by the inlet and outlet sealing floats, isolating it from the outside atmosphere and preventing water evaporation, thus maintaining the water seal for a long time. During drainage, the two floats rise synchronously, fully opening the drainage channel, ensuring smooth water flow without mechanical resistance, and the drainage flow rate is limited only by the diameter of the U-shaped water storage pipe itself. When pressure fluctuations occur in the main drain pipe, external negative or positive pressure actually enhances the sealing force at the corresponding end, improving anti-interference capabilities. Simultaneously, all water-passing surfaces are smooth curved surfaces, without dead corners or narrow gaps, allowing impurities to be discharged with the water flow, eliminating the need for manual cleaning. Therefore, this invention achieves the technical effects of smooth drainage, permanent water seal, resistance to positive and negative pressure impacts, maintenance-free operation, and wide compatibility without relying on external energy or adding complex control mechanisms, solving the core technical problems that existing floor drains and similar drainage devices have long failed to overcome. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the long-term full-water drain with sealed ends according to the present invention; Figure 2 This is the external front view of the present invention.

[0016] The attached figures are labeled as follows: 1—U-shaped water storage pipe; 2—Water inlet sealing port; 3—Upright pot bottom; 4—Water inlet sealing float; 5—Water inlet sealing cylinder; 6—Drain hole; 7—Water inlet filter cover; 8—Drain sealing cover; 9—Drain sealing float; 10—Drain sealing cylinder; 11—Drain interface; 12—Hypothetical water storage line; 13—Inverted pot bottom; 14—Drain sealing port. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings: like Figure 1 and Figure 2 As shown, the long-term full-water floor drain with sealed ends according to the present invention includes a U-shaped water storage pipe 1, a water inlet sealing port 2, an upright pot bottom 3, a water inlet sealing float 4, a water inlet sealing cylinder 5, a drain hole 6, a water inlet filter cover 7, a drain sealing cover 8, a drain sealing float 9, a drain sealing cylinder 10, a drain interface 11, a simulated water storage line 12, an inverted pot bottom 13, and a drain sealing port 14. The U-shaped water storage pipe 1 serves as the core structure of the entire floor drain, forming a closed U-shaped waterway inside to store a certain height of water for a water seal function. The water inlet sealing port 2 is located at the upper left opening of the U-shaped water storage pipe 1, and the drain sealing port 14 is located at the upper right opening of the U-shaped water storage pipe 1, forming the channels for water inflow and outflow, respectively.

[0018] A water inlet sealing cylinder 5 is installed above the water inlet end of the U-shaped water storage pipe 1. The water inlet sealing cylinder 5 is a vertical hollow cylindrical structure. Its bottom is connected to the water inlet sealing port 2, and its top is covered with a water inlet filter cover 7. Multiple leakage holes 6 are evenly distributed on the water inlet filter cover 7, with a hole diameter ranging from 3 mm to 6 mm. The total open area is not less than 65% of the cross-sectional area of ​​the water inlet sealing cylinder 5, so as to ensure that the water flows in smoothly while effectively intercepting large particles of impurities such as hair and paper scraps. The water inlet sealing float 4 is set inside the water inlet sealing cylinder 5. Its outer diameter is slightly smaller than the inner diameter of the water inlet sealing cylinder 5, so that the water inlet sealing float 4 can float freely up and down inside the water inlet sealing cylinder 5. The water inlet sealing float 4 is made of high-strength engineering plastic with a density between 0.8 g / cm³ and 0.95 g / cm³, so that it can sit on the water inlet sealing port 2 by its own weight to form a seal when there is no water, and float up with the rise of water level when there is water. The sealing surface of the water inlet sealing port 2 is a conical structure with a surface roughness Ra≤0.8μm. The bottom of the water inlet sealing float 4 is provided with a matching conical sealing surface. When the two come into contact, they form a line seal, improving the sealing reliability. The outer edge of the water inlet sealing port 2 is connected to an upright pot bottom 3. The upright pot bottom 3 has an upwardly convex smooth curved surface with a radius of curvature that is coordinated with the bottom of the water inlet sealing float 4. This allows the water inlet sealing float 4 to slide naturally into the center position of the water inlet sealing port 2 along the curved surface during the fall, avoiding skewness and jamming.

[0019] A drainage sealing cylinder 10 is installed above the drain end of the U-shaped water storage pipe 1. Its structure is symmetrical to that of the water inlet sealing cylinder 5. The bottom is connected to the drainage sealing port 14, and the top is sealed by the drainage sealing cover 8. The drainage sealing float 9 is placed inside the drainage sealing cylinder 10. Its material, density, and floating characteristics are the same as those of the water inlet sealing float 4. It can also seal the drainage sealing port 14 by its own weight when there is no water, and float up to open the drainage channel under water pressure. The drainage sealing port 14 also adopts a conical sealing structure, forming a matching line seal with the bottom of the drainage sealing float 9. An inverted pot bottom 13 is connected to the outer edge of the drainage sealing port 14. The inverted pot bottom 13 has a smooth, downward-concave curved surface. Its radius of curvature is adapted to the bottom of the drainage sealing float 9, ensuring that the drainage sealing float 9 can automatically center and tightly fit the drainage sealing port 14 when it is seated. A drain interface 11 is provided on the side wall of the drain sealing cylinder 10 near the lowest point of the inverted pot bottom 13. The drain interface 11 can be designed to be horizontal or vertically downward to adapt to the access requirements of different building sewage mains. When the horizontal direction is adopted, the axis of the drain interface 11 is coplanar with the axis of the drain end of the U-shaped water storage pipe 1, which facilitates direct connection to the horizontal sewage pipe. When the vertical downward direction is adopted, the drain interface 11 is located at the bottom center of the drain sealing cylinder 10, which is suitable for installation scenarios where the water is discharged downward into the riser pipe.

[0020] Under normal, non-drained conditions, the U-shaped water storage pipe 1 is filled with water, and the water level is close to the assumed water storage line 12. This assumed water storage line 12 is a horizontal reference line connecting the center points of the inlet sealing port 2 and the outlet sealing port 14. The actual water seal depth is not less than 50 mm, meeting national hygiene standards. At this time, the inlet sealing float 4 sits on the inlet sealing port 2 due to its own weight, and the outlet sealing float 9 also sits on the outlet sealing port 14 due to its own weight, completely sealing the U-shaped water storage pipe 1. The internal water is isolated from the outside atmosphere, and the water cannot evaporate, thus achieving long-term water seal maintenance. When a user showers, drains a washing machine, or drains a sink, water flows through the drain outlet on the floor or fixture into the drain hole 6 on the inlet filter cover 7, enters the inlet sealing cylinder 5, and the water level gradually rises. The inlet sealing float 4 rises accordingly, opening the inlet sealing port 2. Simultaneously, water flows into the U-shaped water storage pipe 1, pushing the internal water level up. Water pressure acts on the bottom of the drain sealing float 9, causing it to overcome its own weight and rise. The drain sealing port 14 opens simultaneously, forming a continuous and unobstructed drainage path from the inlet filter cover 7 → inlet sealing cylinder 5 → U-shaped water storage pipe 1 → drain sealing cylinder 10 → drain interface 11. Because the annular gap area between the outer diameter of the inlet sealing float 4 and the inner wall of the inlet sealing cylinder 5 is not less than 1.2 times the cross-sectional area of ​​the U-shaped water storage pipe 1, and the annular gap between the drain sealing float 9 and the drain sealing cylinder 10 also meets the same requirement, there is no throttling effect during drainage. The drainage flow is only limited by the diameter of the U-shaped water storage pipe 1 itself, easily handling the instantaneous high-flow-rate drainage needs of the washing machine or the continuous drainage needs of the shower.

[0021] After drainage is completed, the water level in the U-shaped water storage pipe 1 gradually drops back to near the assumed water level 12. Under their own weight, the inlet sealing float 4 and the drain sealing float 9 fall back to the inlet sealing port 2 and the drain sealing port 14 respectively, re-establishing a seal. During this process, even if a small amount of water remains in the inlet sealing cylinder 5 and is exposed to the atmosphere, its evaporation is minimal and does not affect the overall sealing performance. Once the residual water has completely evaporated, the inlet sealing float 4 immediately and tightly adheres to the inlet sealing port 2, restoring a complete seal. When the main sewage pipe of the building generates negative pressure due to simultaneous drainage from multiple households, the external atmospheric pressure acts on the top of the inlet sealing float 4 through the inlet filter cover 7, pressing it more tightly against the inlet sealing port 2 to prevent water from being sucked out of the U-shaped water storage pipe 1. When the main sewage pipe generates positive pressure due to drainage from high-rise buildings, the positive pressure airflow enters the drain sealing cylinder 10 through the drain interface 11, acts on the bottom of the drain sealing float 9, pressing it tightly against the drain sealing port 14 to prevent odor from flowing back into the U-shaped water storage pipe 1. Therefore, regardless of whether the main drain pipe is under positive pressure, negative pressure or normal pressure, the U-shaped water storage pipe 1 can always maintain a full water state, and the water seal function is always effective.

[0022] This invention can also be applied to secondary drainage scenarios: the entire drain structure is embedded at the lowest point of the backfill layer of the bathroom sink. The inlet end receives accumulated water in the backfill layer through a seepage channel, and the outlet end is connected to the building's main sewage pipe through the drain interface 11. Due to the double sealing effect of the inlet sealing float 4 and the outlet sealing float 9, even if there is no water flow for a long time, the water seal in the U-shaped water storage pipe 1 will not evaporate, and the positive and negative pressure fluctuations of the sewage pipe cannot destroy the water seal, completely solving the problem of odor backflow during secondary drainage. In urinal or washbasin applications, the inlet end of the U-shaped water storage pipe 1 is directly connected to the drain outlet of the sanitary ware, and the outlet end is connected to the main sewage pipe, replacing the traditional open water trap or mechanical sealing device, achieving long-term odor isolation and high-flow drainage. All water-passing components—including the upright pot bottom 3, the inner wall of the U-shaped water storage pipe 1, and the inverted pot bottom 13—are smooth curved surfaces without steps, sharp angles, or narrow gaps, so that hair, mud, and other impurities cannot be trapped and are directly discharged with the water flow, without the need for manual cleaning. The inlet filter cover 7 and the drain sealing cover 8 can be designed as a single integrated cover, fixed by connecting ribs, or they can be set independently. The top of the drain sealing cover 8 can have an inspection hole with a sealing plug, serving as a sealed top cover for maintenance, facilitating periodic checks of the internal float's condition. The U-shaped water storage pipe 1, the inlet sealing cylinder 5, and the drain sealing cylinder 10 can be integrally injection molded from stainless steel, copper, aluminum alloy, or high-strength plastic, or they can be manufactured separately and connected by threads, snaps, or flanges, with silicone sealing rings at the connections to ensure sealing. The surfaces of the inlet sealing float 4 and the drain sealing float 9 can be coated with a 0.5 mm thick silicone elastic layer to further enhance the fit and durability of the sealing surfaces. Through the above structural design and operating mechanism, this invention achieves the technical effects of smooth drainage, permanent water seal maintenance, resistance to positive and negative pressure impacts, maintenance-free operation, and wide applicability without requiring external energy or relying on complex control mechanisms, comprehensively solving the core technical problems of existing floor drains and similar drainage devices.

[0023] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A floor drain with sealed ends that can be kept full of water for extended periods, characterized in that, The system includes a U-shaped water storage pipe (1), a water inlet sealing port (2), an upright pot bottom (3), a water inlet sealing float (4), a water inlet sealing cylinder (5), a drain hole (6), a water inlet filter cover (7), a drain sealing cover (8), a drain sealing float (9), a drain sealing cylinder (10), a drain interface (11), an inverted pot bottom (13), and a drain sealing port (14). The two ends of the U-shaped water storage pipe (1) are the water inlet end and the drain end, respectively. The water inlet sealing port (2) is located at the water inlet end of the U-shaped water storage pipe (1), and the drain sealing port (14) is located at the drain end of the U-shaped water storage pipe (1). The water inlet sealing float (3) 4) Installed above the water inlet sealing port (2) and can float up and down inside the water inlet sealing cylinder (5); The drain sealing float (9) is installed above the drain sealing port (14) and can float up and down inside the drain sealing cylinder (10); The water inlet filter cover (7) covers the top of the water inlet sealing cylinder (5) and has multiple water leakage holes (6); The upright pot bottom (3) is connected to the outer edge of the water inlet sealing port (2) and has an upward convex curved surface structure; The inverted pot bottom (13) is connected to the outer edge of the drain sealing port (14) and has a downward concave curved surface structure; The drain interface (11) is set on the side wall or bottom of the drain sealing cylinder (10).

2. The floor drain with sealed ends and long-term full water supply as described in claim 1, characterized in that, The inlet sealing float (4) and the inlet sealing port (2) form a first dynamic sealing pair, and the drain sealing float (9) and the drain sealing port (14) form a second dynamic sealing pair; the density of the inlet sealing float (4) and the drain sealing float (9) is greater than that of air and less than that of water.

3. The floor drain with sealed ends and long-term full water supply as described in claim 2, characterized in that, The sealing surfaces of the water inlet sealing port (2) and the drainage sealing port (14) are conical structures with a surface roughness of no more than Ra 0.8 μm. The bottom sealing surfaces of the water inlet sealing float (4) and the drainage sealing float (9) are respectively matched with the conical structures of the water inlet sealing port (2) and the drainage sealing port (14), forming a line seal when in contact.

4. The floor drain with sealed ends and long-term full water supply as described in claim 1, characterized in that, The inner diameter of the water inlet sealing cylinder (5) is not less than the inner diameter of the water inlet end of the U-shaped water storage pipe (1), and the area of ​​the annular gap between the outer diameter of the water inlet sealing float (4) and the inner wall of the water inlet sealing cylinder (5) is not less than 1.2 times the cross-sectional area of ​​the U-shaped water storage pipe (1); the area of ​​the annular gap between the outer diameter of the drainage sealing float (9) and the inner wall of the drainage sealing cylinder (10) is not less than 1.2 times the cross-sectional area of ​​the U-shaped water storage pipe (1).

5. The floor drain with sealed ends and long-term full water supply as described in claim 1, characterized in that, The radius of curvature of the upright pot bottom (3) is coordinated with the bottom curvature of the water inlet sealing float (4), and the radius of curvature of the inverted pot bottom (13) is coordinated with the bottom curvature of the drainage sealing float (9); the inner surfaces of the upright pot bottom (3) and the inverted pot bottom (13) are both smooth curved surfaces without steps, sharp angles or grooves.

6. The floor drain with sealed ends and long-term full water supply as described in claim 1, characterized in that, The water inlet filter cover (7) has a water leakage hole (6) that is circular, elliptical or polygonal, with a hole diameter ranging from 2 mm to 8 mm, and the total opening area is not less than 60% of the cross-sectional area of ​​the water inlet sealing cylinder (5).

7. The floor drain with sealed ends and long-term full water supply as described in claim 1, characterized in that, The U-shaped water storage pipe (1), the water inlet sealing cylinder (5) and the drainage sealing cylinder (10) are integrally formed structures or separate assembly structures; when a separate assembly structure is adopted, each component is fixed by threaded connection, snap connection or flange connection, and a sealing gasket is provided at the connection.

8. The floor drain with sealed ends and long-term full water supply as described in claim 1, characterized in that, The inlet sealing float (4) and the drain sealing float (9) are solid or hollow structures, and the materials include stainless steel, aluminum alloy, copper, high-strength engineering plastic or silicone; the surfaces of the inlet sealing float (4) and the drain sealing float (9) are covered with an elastic sealing layer.

9. The floor drain with sealed ends and long-term full water supply as described in claim 1, characterized in that, The outlet direction of the drain interface (11) is either horizontal or vertically downward. When it is horizontal, the axis of the drain interface (11) is coplanar with the axis of the drain end of the U-shaped water storage pipe (1). When it is vertically downward, the drain interface (11) is located at the center of the bottom of the drain sealing cylinder (10).

10. The floor drain with sealed ends and long-term full water supply as described in claim 1, characterized in that, The radius of curvature of the inner wall of the curved section of the U-shaped water storage pipe (1) is not less than 1.5 times its pipe diameter; the minimum water seal depth inside the U-shaped water storage pipe (1) is not less than 50 mm.

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