Odor-resistant and anti-backflow floor drain

Abstract

This invention relates to the field of building drainage equipment technology, and in particular to an odor-proof and backflow-proof floor drain. The floor drain includes, from top to bottom, a top pipe fitting, a first drain pipe fitting, a second drain pipe fitting, and an air-sealing pipe. The first drain pipe fitting contains a frustum-shaped water distribution hopper and a float constrained by a float-limiting rod. The water distribution hopper, in conjunction with the drum-shaped inner cavity, guides water flow along the pipe wall, preventing water from directly impacting the float and causing drainage problems. The second drain pipe fitting contains a diaphragm ring and a spring-driven drain hole seal. When water is not flowing, the spring pushes the seal to close the drain hole; when backflow occurs, the seal and spring work together to block sewage. The air-sealing pipe has a U-shaped bend, and water inside forms a liquid seal. The triple odor-proof mechanism of the float gravity seal, the mechanical seal, and the U-shaped water seal works synergistically to effectively isolate pipe odors and prevent sewage backflow.

Description

Technical Field

[0001] This invention relates to the field of building drainage equipment technology, and in particular to an odor-proof and backflow-proof floor drain. Background Technology

[0002] Floor drains are key components in building drainage systems, connecting indoor drainage facilities to underground drainage networks. Their basic function is to guide indoor sewage smoothly out of the building while preventing odors, harmful gases, and pests from entering the room through the drainage channels. With the increasing demands for high-quality living environments, the odor-proof performance and drainage reliability of floor drains have become important indicators for evaluating their overall performance.

[0003] Currently, most odor-proof floor drains on the market rely on a single water seal structure or a one-way valve structure to achieve their odor-proof function. The water seal structure uses a liquid column remaining in the bend to isolate gas in the pipe. However, when the floor drain is not used for a long time or the ambient temperature is high, the water in the pipe can easily evaporate and disappear, causing the water seal to fail and thus losing its odor-proof ability. While the one-way valve structure can seal the pipe without relying on water, when a large amount of water rushes in within a short period, the valve's opening response and flow cross-section often cannot meet the instantaneous drainage demand, easily causing poor drainage or even backflow from the floor drain opening. Furthermore, when there are abnormal fluctuations in the municipal pipe network pressure, downstream sewage may backflow along the drainage pipe due to a positive pressure difference. Existing single-layer sealing structures cannot provide sufficient backflow interception capacity under such conditions. The root cause of these problems is that most existing floor drains only have a single-layer odor-proof or sealing mechanism, failing to achieve both long-term odor prevention and reliable backflow prevention while ensuring efficient drainage. Summary of the Invention

[0004] The purpose of this invention is to provide an odor-proof and backflow-proof floor drain, which aims to solve the problems of unsustainable odor-proof effect, poor drainage, and sewage backflow caused by the simple odor-proof and sealing structure of existing floor drains.

[0005] To achieve the above objectives, the present invention provides an odor-proof and backflow-proof floor drain, comprising a top pipe, a first drain pipe, a second drain pipe, and an air-blocking pipe connected sequentially from top to bottom; the first drain pipe includes a first drain pipe, with a water-dividing hopper fixedly provided at the upper end of the first drain pipe, and a water passage formed between the outer wall of the water-dividing hopper and the inner wall of the first drain pipe; the inner diameter of the first drain pipe gradually increases from the upper end to the middle, and then gradually decreases from the middle to the lower end, forming a drum-shaped structure; the water-dividing hopper has a frustum-shaped structure that is narrow at the top and wide at the bottom; a plurality of downwardly extending float limiting rods are fixed at the bottom end of the water-dividing hopper, and floats are vertically slidably disposed within the limiting space formed by the plurality of float limiting rods; the second drain pipe includes a top pipe, a first drain pipe, a second drain pipe, and an air-blocking pipe. A second drain pipe is located below the first drain pipe. The top opening of the second drain pipe faces the float, and the inner diameter of the top opening of the second drain pipe is smaller than the outer diameter of the float. A spacer ring is fixed inside the cavity of the second drain pipe, and a drain hole is opened at the center of the spacer ring. A drain hole sealing plug is located below the spacer ring, and the diameter of the drain hole sealing plug is larger than the diameter of the drain hole. A guide member is connected to the drain hole sealing plug and passes through the spacer ring. A spring is sleeved between the guide member and the spacer ring. The spring force is configured to drive the drain hole sealing plug to move upward and abut against the lower surface of the spacer ring to seal the drain hole. An air-tight pipe is fixed below the second drain pipe, and the air-tight pipe is in the form of a U-shaped bend.

[0006] In a preferred embodiment of the present invention, the guide member includes several smooth rods fixed to the upper surface of the drain hole sealing plug near its edge. A guide hole is provided on the spacer ring, corresponding to and slidingly engaging with each smooth rod. Each smooth rod extends vertically upward through the guide hole and outwards above the spacer ring. A convex ring with an outer diameter larger than the diameter of the guide hole is fixed to the top of each smooth rod. A spring surrounds the outer circumference of the smooth rod, with its upper end abutting against the bottom surface of the convex ring and its lower end abutting against the upper surface of the spacer ring. Through the sliding engagement of the smooth rods with the guide holes, the drain hole sealing plug always moves axially without swaying during lifting and lowering, ensuring the accuracy of the sealing action and the reliability of the seal.

[0007] In a preferred embodiment of the present invention, the water distribution bucket is fixedly suspended within the inner cavity of the first drain pipe by a plurality of support rods. The support rods are evenly distributed circumferentially, with one end of each rod fixedly connected to the outer wall of the water distribution bucket and the other end fixedly connected to the inner wall of the first drain pipe. While ensuring the stable suspension of the water distribution bucket, the support rods also leave gaps between them, preventing significant obstruction to water flow.

[0008] In a preferred embodiment of the present invention, a plurality of the float limiting rods are distributed in a ring at equal intervals along the periphery of the bottom surface of the water distribution hopper, and the surfaces of the float limiting rods are smooth; the outer diameter of the float is smaller than the diameter of the inner circle formed by the combined enclosing of the float limiting rods. The smooth surface design of the float limiting rods minimizes the frictional resistance when the float moves up and down, which is beneficial to the float's sensitive response to changes in water level.

[0009] As a preferred embodiment of the present invention, the top opening edge of the second drain pipe has a smooth, arc-shaped chamfered structure. When water is not flowing through, the float rests at the top opening of the second drain pipe, and its lower spherical surface seals against the arc-shaped chamfered structure. The arc-shaped chamfered structure ensures a tight seal when the float rests, and also allows water to flow smoothly into the pipe along the arc-shaped edge during drainage.

[0010] As a preferred embodiment of the present invention, the top pipe includes a panel that is embedded and flush with the ground surface during installation, and a receiving pipe fixedly connected to the bottom of the panel; the surface of the panel is provided with a plurality of through holes for water to flow in, and the bottom end of the receiving pipe is coaxially and fixedly connected to the upper end of the first drain pipe.

[0011] In a preferred embodiment of the present invention, a first annular groove is formed at the edge of the through hole of the panel, and a first filter screen is detachably embedded in the first groove; a second groove is formed at the upper end of the receiving pipe, and a second filter screen is detachably placed in the second groove; the mesh size of the second filter screen is smaller than that of the first filter screen. The combination of the first and second filter screens forms a two-stage filtration system from coarse to fine, which can effectively intercept hair and fine impurities, and prevent the normal operation of the internal sealing elements from being affected by the accumulation of impurities.

[0012] As a preferred technical solution of the present invention, the float is a hollow sphere or a foamed sphere made of a lightweight corrosion-resistant material with a density less than that of water, so as to ensure that it can respond sensitively to and float under slight water level changes.

[0013] As a preferred embodiment of the present invention, the first drain pipe fitting and the top pipe fitting, as well as the second drain pipe fitting and the first drain pipe fitting, are coaxially connected, and the pipe fittings are sealed and fixed by threaded connection, socket bonding or snap-fit ​​assembly.

[0014] As a preferred embodiment of the present invention, a drain pipe is also included, which is fixedly connected to the outlet end of the air-sealing pipe to guide the liquid flowing out of the air-sealing pipe to the external drainage network.

[0015] The present invention has the following beneficial effects:

[0016] This invention constructs a triple odor prevention system combining gravity sealing, mechanical sealing, and water seal isolation by setting a float sealing structure in the first drain pipe fitting, setting a spring-driven drain hole sealing plug in the second drain pipe fitting, and connecting a U-shaped air-tight pipe below the second drain pipe fitting. When water is not flowing, the float and sealing plug close under the action of gravity and spring force, respectively. With the water column always maintained in the U-shaped pipe, it can prevent odor from escaping from the pipe from multiple dimensions. Moreover, when one layer fails temporarily due to extreme conditions, the other two layers can still maintain a seal.

[0017] This invention utilizes the frustum-shaped structure of the water distribution hopper and the drum-shaped inner cavity of the first drain pipe to guide the water flow obliquely downwards along the pipe wall and converge at the intersection of the float and the second drain pipe opening. This avoids the opening delay caused by the water flow directly impacting the float, ensuring the immediacy and smoothness of drainage, and effectively reducing the risk of backflow when a large amount of water rushes in within a short period of time. At the same time, when abnormal pipe network pressure causes sewage backflow, the drain hole seal can tightly seal the drain hole under the combined action of spring force and backflow pressure, achieving reliable backflow interception. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of the overall structure (drainage state) of a preferred embodiment of the present invention.

[0020] Figure 3 This is a cross-sectional view of the overall structure of a preferred embodiment of the present invention (without drainage).

[0021] Figure 4 This is a schematic diagram of the top pipe fitting in a preferred embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the first drain pipe fitting in a preferred embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the second drain pipe fitting in a preferred embodiment of the present invention.

[0024] Illustration:

[0025] 1. Top fittings; 11. Panel; 12. Receiving pipe; 13. First settling tank; 14. Second settling tank;

[0026] 2. First drain pipe fitting; 21. First drain pipe; 22. Water distribution hopper; 23. Support rod; 24. Water passage; 25. Float ball limiting rod; 26. Float ball;

[0027] 3. Second drain fitting; 31. Second drain pipe; 32. Spacer ring; 33. Drain hole; 34. Drain hole sealant; 35. Smooth rod; 36. Convex ring; 37. Spring;

[0028] 4. Air barrier pipe; 5. Drain pipe; 6. First filter screen; 7. Second filter screen. Detailed Implementation

[0029] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0030] Please see Figures 1 to 6 This embodiment provides an odor-proof and backflow-proof floor drain, which is generally composed of a top pipe fitting 1, a first drain pipe fitting 2, a second drain pipe fitting 3, an air-tight pipe 4, and a drain pipe 5, which are fixedly connected from top to bottom. The pipe fittings can be connected using conventional pipe connection methods such as threaded connections, socket bonding, or snap-fit ​​to achieve a sealed assembly. After assembly, a complete drainage channel from the ground surface to the drainage network is formed. Structurally, this floor drain integrates a triple protection mechanism of float ball sealing, spring-driven mechanical sealing, and U-shaped water seal, which can individually or collaboratively block the upward escape of odors from the pipe under different operating conditions and effectively intercept sewage backflow when the pipe network pressure is abnormal.

[0031] like Figure 1 and Figure 4 As shown, the top fitting 1 includes a panel 11 and a receiving pipe 12. The panel 11 has a plate-like structure and is embedded in the ground and flush with the ground surface during installation. It has through holes on its surface to allow water to flow in. A first recess 13 is provided at the edge of the through holes in the panel 11. The first recess 13 is an annular groove formed around the circumference of the through holes. A first filter screen 6 is embedded in the first recess 13. The first filter screen 6 has a relatively large mesh size and is mainly used to intercept larger impurities such as hair and paper scraps, preventing them from entering the drain and clogging the drainage channel. The receiving pipe 12 is fixedly connected to the lower part of the panel 11 and extends downwards in a cylindrical shape, serving as a transition channel for water to flow from the panel 11 into the drain. A second recess 14 is provided at the upper end of the receiving pipe 12. A second filter screen 7 is placed in the second recess 14. The mesh size of the second filter screen 7 is smaller than that of the first filter screen 6, and it is used to perform secondary filtration on the water after primary filtration, further intercepting fine particles and residual impurities. The combination of the first filter screen 6 and the second filter screen 7 forms a two-stage filtration system, from coarse to fine, which effectively reduces the probability of impurities entering the core sealing area of ​​the drain and prevents the float ball 26 or the drain hole seal 34 from being affected by the accumulation of foreign objects. Both the first filter screen 6 and the second filter screen 7 are detachable, making it easy for users to remove and clean them regularly, and maintenance is simple.

[0032] like Figure 5As shown, the first drain pipe fitting 2 includes a first drain pipe 21, which is fixed below the receiving pipe 12, and the two are coaxially connected. The first drain pipe 21 has a drum-shaped profile, narrow at both ends and wide in the middle, meaning the pipe diameter gradually increases from the upper end to the middle and then gradually decreases from the middle to the lower end. This profile design creates a smooth arc-shaped transition surface on the inner wall of the pipe cavity. A water distribution hopper 22 is installed at the upper end of the first drain pipe 21, and the water distribution hopper 22 is fixed in the inner cavity of the first drain pipe 21 by several support rods 23. The support rods 23 are evenly distributed circumferentially, with one end fixedly connected to the outer wall of the water distribution hopper 22 and the other end fixedly connected to the inner wall of the first drain pipe 21, so that the water distribution hopper 22 is suspended in the center of the pipe opening, and there are gaps between the support rods 23, so as not to significantly obstruct the flow of water. An annular water passage 24 is formed between the outer wall of the water distribution hopper 22 and the inner wall of the first drain pipe 21. Water flows down through the water passage 24 after flowing down from the receiving pipe 12.

[0033] The water distribution hopper 22 is shaped like a frustum, narrower at the top and wider at the bottom. Its top surface area is smaller than its bottom surface area. When water falls from above, it first contacts the top of the water distribution hopper 22, then disperses along its sloping outer wall, evenly guiding it into the water passage 24. This frustum-shaped geometry, combined with the drum-shaped inner cavity of the first drain pipe 21 (narrower at the top, wider at the bottom, and then narrower again), allows the water to flow obliquely downwards along the inner wall of the first drain pipe 21 after entering the water passage 24, rather than falling straight down. The longer path and more even velocity distribution of the water flow along the wall ensure that when it reaches the lower outlet of the first drain pipe 21, it converges along the pipe wall rather than concentrating on impacting the float 26 directly below. This effectively prevents the float 26 from being held down by the water flow due to a large flow, thus ensuring timely and smooth drainage and reducing the risk of backflow when a large amount of water rushes in within a short period.

[0034] Several float-limiting rods 25 are fixed to the bottom of the water distribution hopper 22. These rods are arranged in a ring at equal intervals along the periphery of the bottom surface of the hopper 22, extending downwards. The surfaces of the float-limiting rods 25 are smoothed, and the multiple rods together form a vertical cage-like limiting space. A float 26 is placed inside this limiting space, its outer diameter slightly smaller than the inner diameter enclosed by the float-limiting rods 25, allowing the float 26 to slide freely up and down along the float-limiting rods 25 in the vertical direction without shifting or falling off in the horizontal direction. The float 26 can be made of a material with a density less than water, such as a hollow plastic sphere or a foamed sphere, allowing it to float rapidly under the buoyancy of the water flow. Because the surfaces of the float-limiting rods 25 are smooth and there is an appropriate gap between them and the float 26, the frictional resistance of the float 26 during its up-and-down movement is extremely small, resulting in a sensitive response.

[0035] like Figure 2 , Figure 3and Figure 6 As shown, the second drain pipe fitting 3 includes a second drain pipe 31, which is fixed below the first drain pipe 21 and coaxially connected to it. The diameter of the top opening of the second drain pipe 31 is designed to be smaller than the diameter of the float 26, so that when there is no water flow, the float 26 falls naturally under its own weight and rests at the top opening of the second drain pipe 31, sealing the opening by the fit between the spherical surface and the edge of the opening. The edge of the top opening of the second drain pipe 31 is processed into a smooth arc-shaped chamfer, which ensures a tight fit and good sealing effect when the float 26 is seated, and allows water to flow smoothly into the pipe along the arc-shaped edge during drainage, without water accumulation or eddies at the opening.

[0036] A partition ring 32 is fixed inside the cavity of the second drain pipe 31. The partition ring 32 is an annular plate-shaped component, whose outer edge is fixedly connected to the inner wall of the second drain pipe 31. A drain hole 33 is opened at the center, which forms a channel for water to continue flowing downward in the draining state. A drain hole sealing plug 34 is provided below the partition ring 32. The drain hole sealing plug 34 is disc-shaped, and its diameter is larger than the diameter of the drain hole 33. When the drain hole sealing plug 34 moves upward and adheres to the lower surface of the partition ring 32, it can completely cover and seal the drain hole 33. Several smooth rods 35 are fixed near the edge of the upper surface of the drain hole sealing plug 34. Each smooth rod 35 is evenly distributed along the periphery of the drain hole sealing plug 34, and extends vertically upward through the corresponding guide hole opened on the partition ring 32 and extends to the top of the partition ring 32. The guide hole on the spacer ring 32 and the polished rod 35 are fitted with a clearance fit, allowing the polished rod 35 to slide up and down along the guide hole, thus guiding and preventing deviation of the drain hole sealing plug 34. A protruding ring 36 is fixed to the top of each polished rod 35 extending above the spacer ring 32. The outer diameter of the protruding ring 36 is larger than the diameter of the guide hole, serving as a limit to prevent the polished rod 35 from falling out downwards. A spring 37 is fitted between the protruding ring 36 and the upper surface of the spacer ring 32. The spring 37 surrounds the outer circumference of the polished rod 35, with its upper end abutting against the bottom surface of the protruding ring 36 and its lower end abutting against the upper surface of the spacer ring 32. In its natural state, the spring 37 is in a freely extended or slightly pre-compressed state. Its elastic force pushes the drain hole sealing plug 34 upwards through the protruding ring 36 and the polished rod 35, causing the drain hole sealing plug 34 to fit tightly against the lower surface of the spacer ring 32 and seal the drain hole 33.

[0037] The vent pipe 4 is fixed below the second drain pipe 31, and its overall shape is a U-shaped bend. Liquid is always present at the lowest point of the U-shaped bend. Even if the floor drain is not used for a long time, as long as the water in the U-shaped pipe has not completely evaporated, it can continuously prevent downstream odors from seeping upwards through a liquid seal. The diameter of the U-shaped vent pipe 4 matches the diameter of the second drain pipe 31, and will not create additional resistance to the drainage flow. The drain pipe 5 is fixedly connected to the outlet end of the vent pipe 4, and is used to introduce the liquid filtered and discharged by the floor drain into the building's drainage network. The diameter and connection method of the drain pipe 5 can be adapted to the specifications of the actual drainage network.

[0038] The working process of this floor drain under normal drainage conditions is as follows. Figure 2 As shown, indoor floor water flows through the through-holes on panel 11 into top pipe 1. The first filter 6 initially intercepts large particles such as hair, and the water then enters the receiving pipe 12. The second filter 7 performs secondary filtration on the remaining fine impurities in the water. The water that has passed through the secondary filtration flows down along the receiving pipe 12 and enters the cavity of the first drain pipe 21. Guided by the frustum-shaped outer wall of the water distribution hopper 22, it disperses in all directions and flows down along the water passage 24. Because the inner wall of the first drain pipe 21 is an arc shape with a convex center, the water flows downward along an inclined path guided by the wall and reaches the lower end of the first drain pipe 21, flowing along the pipe wall towards the intersection area of ​​the float 26 and the opening of the second drain pipe 31. As the water level in this area rises rapidly, the water flow generates an upward buoyancy force on the float 26, and the float 26 then floats up along the float limiting rod 25 and detaches from the opening of the second drain pipe 31. The opening opens, and the water immediately enters the second drain pipe 31. The water continues to flow downwards to the partition ring 32. The downward water pressure acts on the drain hole seal 34, overcoming the elastic force of the spring 37 and pushing the drain hole seal 34 downwards. The drain hole 33 then opens, and the water flows through the drain hole 33 into the air-tight pipe 4, and then out through the U-shaped bend and drain pipe 5. Throughout the drainage process, the guiding effect of the water distribution hopper 22 prevents the water flow from directly impacting the top of the float 26. The float 26 can quickly respond and rise at the first moment of water flow convergence, ensuring a smooth and unobstructed drainage path.

[0039] The sealing condition of the floor drain when it is not draining is as follows: Figure 3As shown. When no water flows through, the float 26 falls naturally along the float limiting rod 25 under its own weight. The bottom of its spherical surface fits tightly against the arc-shaped edge of the top opening of the second drain pipe 31, sealing the opening of the second drain pipe 31 and blocking the path of foul air from the pipe to the room through the first drain pipe 21. At the same time, the spring 37 returns to its free length without external force, pushing the drain hole sealing plug 34 upward to the lower surface of the partition ring 32 through the convex ring 36 and the smooth rod 35. The drain hole 33 is completely sealed, and even if the gas rising from the vent pipe 4 breaks through the U-shaped water seal, it cannot continue to rise through the drain hole 33. In addition, a certain height of water column is always maintained inside the U-shaped structure of the vent pipe 4. This water column forms a physical barrier between the drainage network and the inner cavity of the floor drain in the form of a water seal. Thus, the gravity seal of the float ball 26 on the opening of the second drain pipe 31, the spring seal of the drain hole sealant 34 on the drain hole 33, and the liquid seal of the water in the air-sealing pipe 4 together form a triple odor barrier. Even if one of the layers fails temporarily due to extreme conditions, the other two layers can still maintain a seal, ensuring that the odor from the pipe will not enter the indoor space.

[0040] When abnormal pressure occurs in the drainage network and sewage backflows upstream, the backflowing water first encounters the buffer of water stored in the U-shaped bend inside the vent pipe 4, reducing its velocity and pressure to a certain extent. Even if the backflow pressure is high, and the sewage breaks through the U-shaped water seal and rises to the partition ring 32, the drain hole seal 34 is tightly sealed at the drain hole 33 under the elastic force of the spring 37. The pressure applied from below by the backflowing water is in the same direction as the thrust of the spring 37, and the two together press the drain hole seal 34 tightly against the partition ring 32. The greater the backflow pressure, the tighter the seal, preventing sewage from continuing to flow upward through the drain hole 33. Furthermore, the state of the float 26 sealing the opening of the second drain pipe 31 above will not change due to the backflow pressure below, further ensuring the reliability of the backflow interception. When the backflow subsides and the network pressure returns to normal, all sealing elements automatically return to their normal sealing positions, allowing for continued normal use without manual intervention.

[0041] Regarding material selection, panel 11 can be made of corrosion-resistant metal materials such as stainless steel or copper alloy to meet the durability requirements of long-term immersion in water. The receiving pipe 12, first drain pipe 21, second drain pipe 31, and vent pipe 4 can be made of engineering plastics or stainless steel, balancing corrosion resistance and structural strength. The float 26 should preferably be made of a lightweight, corrosion-resistant material with a density lower than water to ensure sensitive response to even small water level changes. The spring 37 can be made of stainless steel spring wire to ensure no rust or loss of elasticity during long-term use in humid environments. The first filter screen 6 and the second filter screen 7 can be made of stainless steel wire mesh, with the mesh size determined according to the particle size of the impurities to be intercepted.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A floor drain that prevents odors and backflow, characterized in that, The system includes a top pipe (1), a first drain pipe (2), a second drain pipe (3), and a vent pipe (4) connected sequentially from top to bottom. The first drain pipe (2) includes a first drain pipe (21), and a water distribution hopper (22) is fixedly provided at the upper end of the first drain pipe (21). A water passage (24) is formed between the outer wall of the water distribution hopper (22) and the inner wall of the first drain pipe (21). The inner diameter of the first drain pipe (21) is as follows: The middle section gradually increases in size and then gradually decreases in size towards the lower end, forming a drum-shaped structure; the water distribution hopper (22) has a frustum-shaped structure that is narrow at the top and wide at the bottom; the bottom end of the water distribution hopper (22) is fixed with several downwardly extending float limiting rods (25), and floats (26) are vertically slidably arranged within the limiting space formed by the several float limiting rods (25); the second drain pipe fitting (3) includes a second drain pipe (31) fixed below the first drain pipe (21), the second The top opening of the drain pipe (31) is directly opposite the float (26), and the inner diameter of the top opening of the second drain pipe (31) is smaller than the outer diameter of the float (26); a partition ring (32) is fixed inside the cavity of the second drain pipe (31), and a drain hole (33) is opened at the center of the partition ring (32); a drain hole sealing plug (34) is provided below the partition ring (32), and the diameter of the drain hole sealing plug (34) is larger than the diameter of the drain hole (33); The drain hole sealing plug (34) is connected to a guide that passes through the partition ring (32). A spring (37) is sleeved between the guide and the partition ring (32). The spring (37) is configured to drive the drain hole sealing plug (34) to move upward and abut against the lower surface of the partition ring (32) to seal the drain hole (33). The air-tight pipe (4) is fixed below the second drain pipe (31). The air-tight pipe (4) is in the shape of a U-shaped bend.

2. The odor-proof and backflow-proof floor drain according to claim 1, characterized in that, The guide includes several smooth rods (35) fixed to the upper surface of the drain hole seal (34) near the edge. The spacer ring (32) has guide holes that slide and engage with the smooth rods (35) one by one. Each smooth rod (35) passes vertically upward through the guide hole and extends above the spacer ring (32). The top of the smooth rod (35) is fixed with a convex ring (36) with an outer diameter larger than the diameter of the guide hole. The spring (37) surrounds the outer circumference of the smooth rod (35), and the upper end of the spring (37) abuts against the bottom surface of the convex ring (36), and the lower end abuts against the upper surface of the spacer ring (32).

3. The odor-proof and backflow-proof floor drain according to claim 1, characterized in that, The water distribution bucket (22) is fixedly suspended in the inner cavity of the first drain pipe (21) by a number of support rods (23); the number of support rods (23) are evenly distributed in the circumference, one end of each support rod (23) is fixedly connected to the outer wall of the water distribution bucket (22), and the other end is fixedly connected to the inner wall of the first drain pipe (21).

4. The odor-proof and backflow-proof floor drain according to claim 1, characterized in that, Several of the float limiting rods (25) are distributed in a ring at equal intervals along the periphery of the bottom surface of the water distribution hopper (22), and the surface of the float limiting rods (25) is smooth; the outer diameter of the float (26) is smaller than the inner circle diameter formed by the float limiting rods (25) together.

5. The odor-proof and backflow-proof floor drain according to claim 1, characterized in that, The top opening edge of the second drain pipe (31) is a smooth arc-shaped chamfer structure; when the water is not flowing, the float (26) sits at the top opening of the second drain pipe (31) and its lower spherical surface is sealed and fitted with the arc-shaped chamfer structure.

6. The odor-proof and backflow-proof floor drain according to claim 1, characterized in that, The top fitting (1) includes a panel (11) that is embedded and flush with the ground surface during installation, and a receiving pipe (12) that is fixedly connected to the bottom of the panel (11); the surface of the panel (11) has several through holes for water to flow in, and the bottom end of the receiving pipe (12) is coaxially and fixedly connected to the upper end of the first drain pipe (21).

7. The odor-proof and backflow-proof floor drain according to claim 6, characterized in that, The panel (11) has an annular first groove (13) at the edge of the through hole, and a first filter screen (6) is detachably embedded in the first groove (13); the upper end of the receiving pipe (12) has a second groove (14), and a second filter screen (7) is detachably placed in the second groove (14); the mesh size of the second filter screen (7) is smaller than that of the first filter screen (6).

8. The odor-proof and backflow-proof floor drain according to claim 1, characterized in that, The float (26) is a hollow or foamed sphere made of a lightweight, corrosion-resistant material with a density less than that of water.

9. The odor-proof and backflow-proof floor drain according to claim 1, characterized in that, The first drain pipe fitting (2) and the top pipe fitting (1) are coaxially connected, and the second drain pipe fitting (3) and the first drain pipe fitting (2) are sealed and fixed by threaded connection, socket bonding or snap-fit ​​assembly.

10. The odor-proof and backflow-proof floor drain according to claim 1, characterized in that, It also includes a drain pipe (5), which is fixedly connected to the outlet end of the air-sealing pipe (4) to direct the liquid flowing out of the air-sealing pipe (4) to the external drainage network.

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